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Ray L. Frost - One of the best experts on this subject based on the ideXlab platform.

  • raman and infrared spectroscopic characterization of the Silicate Mineral lamprophyllite
    Spectroscopy Letters, 2015
    Co-Authors: Ray L. Frost, Ricardo Scholz, Andrés López, Yunfei Xi
    Abstract:

    The Mineral lamprophyllite is fundamentally a Silicate based upon tetrahedral siloxane units with extensive substitution in the formula. Lamprophyllite is a complex group of soroSilicates with general chemical formula given as A2B4C2Si2O7(X)4, where the site A can be occupied by strontium, barium, sodium, and potassium; the B site is occupied by sodium, titanium, iron, manganese, magnesium, and calcium. The site C is mainly occupied by titanium or ferric iron and X includes the anions fluoride, hydroxyl, and oxide. Chemical composition shows a homogeneous phase, composed of Si, Na, Ti, and Fe. This complexity of formula is reflected in the complexity of both the Raman and infrared spectra. The Raman spectrum is characterized by intense bands at 918 and 940 cm−1. Other intense Raman bands are found at 576, 671, and 707 cm−1. These bands are assigned to the stretching and bending modes of the tetrahedral siloxane units.

  • a vibrational spectroscopic study of the Silicate Mineral harmotome ba na k 1 2 si al 8o16 6h2o a natural zeolite
    Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2015
    Co-Authors: Ray L. Frost, Antonio Wilson Romano, Andrés López, Lina Wang, Ricardo Scholz
    Abstract:

    Abstract The Mineral harmotome (Ba,Na,K)1-2(Si,Al)8O16⋅6H2O is a crystalline sodium calcium Silicate which has the potential to be used in plaster boards and other industrial applications. It is a natural zeolite with catalytic potential. Raman bands at 1020 and 1102 cm−1 are assigned to the SiO stretching vibrations of three dimensional siloxane units. Raman bands at 428, 470 and 491 cm−1 are assigned to OSiO bending modes. The broad Raman bands at around 699, 728, 768 cm−1 are attributed to water librational modes. Intense Raman bands in the 3100 to 3800 cm−1 spectral range are assigned to OH stretching vibrations of water in harmotome. Infrared spectra are in harmony with the Raman spectra. A sharp infrared band at 3731 cm−1 is assigned to the OH stretching vibration of SiOH units. Raman spectroscopy with complimentary infrared spectroscopy enables the characterization of the Silicate Mineral harmotome.

  • an sem eds and vibrational spectroscopic study of the Silicate Mineral meliphanite ca na 2be si al 2o6 f oh
    Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2015
    Co-Authors: Ray L. Frost, Antonio Wilson Romano, Andrés López, Frederick L Theiss, Ricardo Scholz
    Abstract:

    The Mineral meliphanite (Ca,Na)2Be[(Si,Al)2O6(F,OH)] is a crystalline sodium calcium beryllium Silicate which has the potential to be used as piezoelectric material and for other ferroelectric applications. The Mineral has been characterized by a combination of scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS) and vibrational spectroscopy. EDS analysis shows a material with high concentrations of Si and Ca and low amounts of Na, Al and F. Beryllium was not detected. Raman bands at 1016 and 1050 cm−1 are assigned to the SiO and AlOH stretching vibrations of three dimensional siloxane units. The infrared spectrum of meliphanite is very broad in comparison with the Raman spectrum. Raman bands at 472 and 510 cm−1 are assigned to OSiO bending modes. Raman spectroscopy identifies bands in the OH stretching region. Raman spectroscopy with complimentary infrared spectroscopy enables the characterization of the Silicate Mineral meliphanite.

  • an sem eds and vibrational spectroscopic study of the Silicate Mineral meliphanite ca na 2be si al 2o6 f oh
    Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2015
    Co-Authors: Ray L. Frost, Antonio Wilson Romano, Andrés López, Frederick L Theiss, Ricardo Scholz
    Abstract:

    The Mineral meliphanite (Ca,Na)2Be[(Si,Al)2O6(F,OH)] is a crystalline sodium calcium beryllium Silicate which has the potential to be used as piezoelectric material and for other ferroelectric applications. The Mineral has been characterized by a combination of scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS) and vibrational spectroscopy. EDS analysis shows a material with high concentrations of Si and Ca and low amounts of Na, Al and F. Beryllium was not detected. Raman bands at 1016 and 1050 cm−1 are assigned to the SiO and AlOH stretching vibrations of three dimensional siloxane units. The infrared spectrum of meliphanite is very broad in comparison with the Raman spectrum. Raman bands at 472 and 510 cm−1 are assigned to OSiO bending modes. Raman spectroscopy identifies bands in the OH stretching region. Raman spectroscopy with complimentary infrared spectroscopy enables the characterization of the Silicate Mineral meliphanite.

  • sem edx infrared and raman spectroscopic characterization of the Silicate Mineral yuksporite
    Science & Engineering Faculty, 2015
    Co-Authors: Ray L. Frost, Ricardo Scholz, Andrés López, Frederick L Theiss, Antonio Wilson Romano
    Abstract:

    The Mineral yuksporite (K,Ba)NaCa2(Si,Ti)4O11(F,OH)⋅H2O has been studied using the combination of SEM with EDX and vibrational spectroscopic techniques of Raman and infrared spectroscopy. Scanning electron microscopy shows a single pure phase with cleavage fragment up to 1.0 mm. Chemical analysis gave Si, Al, K, Na and Ti as the as major elements with small amounts of Mn, Ca, Fe and REE. Raman bands are observed at 808, 871, 930, 954, 980 and 1087 cm−1 and are typical bands for a natural zeolite. Intense Raman bands are observed at 514, 643 and 668 cm−1. A very sharp band is observed at 3668 cm−1 and is attributed to the OH stretching vibration of OH units associated with Si and Ti. Raman bands resolved at 3298, 3460, 3562 and 3628 cm−1 are assigned to water stretching vibrations.

Ricardo Scholz - One of the best experts on this subject based on the ideXlab platform.

  • raman and infrared spectroscopic characterization of the Silicate Mineral lamprophyllite
    Spectroscopy Letters, 2015
    Co-Authors: Ray L. Frost, Ricardo Scholz, Andrés López, Yunfei Xi
    Abstract:

    The Mineral lamprophyllite is fundamentally a Silicate based upon tetrahedral siloxane units with extensive substitution in the formula. Lamprophyllite is a complex group of soroSilicates with general chemical formula given as A2B4C2Si2O7(X)4, where the site A can be occupied by strontium, barium, sodium, and potassium; the B site is occupied by sodium, titanium, iron, manganese, magnesium, and calcium. The site C is mainly occupied by titanium or ferric iron and X includes the anions fluoride, hydroxyl, and oxide. Chemical composition shows a homogeneous phase, composed of Si, Na, Ti, and Fe. This complexity of formula is reflected in the complexity of both the Raman and infrared spectra. The Raman spectrum is characterized by intense bands at 918 and 940 cm−1. Other intense Raman bands are found at 576, 671, and 707 cm−1. These bands are assigned to the stretching and bending modes of the tetrahedral siloxane units.

  • a vibrational spectroscopic study of the Silicate Mineral harmotome ba na k 1 2 si al 8o16 6h2o a natural zeolite
    Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2015
    Co-Authors: Ray L. Frost, Antonio Wilson Romano, Andrés López, Lina Wang, Ricardo Scholz
    Abstract:

    Abstract The Mineral harmotome (Ba,Na,K)1-2(Si,Al)8O16⋅6H2O is a crystalline sodium calcium Silicate which has the potential to be used in plaster boards and other industrial applications. It is a natural zeolite with catalytic potential. Raman bands at 1020 and 1102 cm−1 are assigned to the SiO stretching vibrations of three dimensional siloxane units. Raman bands at 428, 470 and 491 cm−1 are assigned to OSiO bending modes. The broad Raman bands at around 699, 728, 768 cm−1 are attributed to water librational modes. Intense Raman bands in the 3100 to 3800 cm−1 spectral range are assigned to OH stretching vibrations of water in harmotome. Infrared spectra are in harmony with the Raman spectra. A sharp infrared band at 3731 cm−1 is assigned to the OH stretching vibration of SiOH units. Raman spectroscopy with complimentary infrared spectroscopy enables the characterization of the Silicate Mineral harmotome.

  • an sem eds and vibrational spectroscopic study of the Silicate Mineral meliphanite ca na 2be si al 2o6 f oh
    Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2015
    Co-Authors: Ray L. Frost, Antonio Wilson Romano, Andrés López, Frederick L Theiss, Ricardo Scholz
    Abstract:

    The Mineral meliphanite (Ca,Na)2Be[(Si,Al)2O6(F,OH)] is a crystalline sodium calcium beryllium Silicate which has the potential to be used as piezoelectric material and for other ferroelectric applications. The Mineral has been characterized by a combination of scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS) and vibrational spectroscopy. EDS analysis shows a material with high concentrations of Si and Ca and low amounts of Na, Al and F. Beryllium was not detected. Raman bands at 1016 and 1050 cm−1 are assigned to the SiO and AlOH stretching vibrations of three dimensional siloxane units. The infrared spectrum of meliphanite is very broad in comparison with the Raman spectrum. Raman bands at 472 and 510 cm−1 are assigned to OSiO bending modes. Raman spectroscopy identifies bands in the OH stretching region. Raman spectroscopy with complimentary infrared spectroscopy enables the characterization of the Silicate Mineral meliphanite.

  • an sem eds and vibrational spectroscopic study of the Silicate Mineral meliphanite ca na 2be si al 2o6 f oh
    Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2015
    Co-Authors: Ray L. Frost, Antonio Wilson Romano, Andrés López, Frederick L Theiss, Ricardo Scholz
    Abstract:

    The Mineral meliphanite (Ca,Na)2Be[(Si,Al)2O6(F,OH)] is a crystalline sodium calcium beryllium Silicate which has the potential to be used as piezoelectric material and for other ferroelectric applications. The Mineral has been characterized by a combination of scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS) and vibrational spectroscopy. EDS analysis shows a material with high concentrations of Si and Ca and low amounts of Na, Al and F. Beryllium was not detected. Raman bands at 1016 and 1050 cm−1 are assigned to the SiO and AlOH stretching vibrations of three dimensional siloxane units. The infrared spectrum of meliphanite is very broad in comparison with the Raman spectrum. Raman bands at 472 and 510 cm−1 are assigned to OSiO bending modes. Raman spectroscopy identifies bands in the OH stretching region. Raman spectroscopy with complimentary infrared spectroscopy enables the characterization of the Silicate Mineral meliphanite.

  • sem edx infrared and raman spectroscopic characterization of the Silicate Mineral yuksporite
    Science & Engineering Faculty, 2015
    Co-Authors: Ray L. Frost, Ricardo Scholz, Andrés López, Frederick L Theiss, Antonio Wilson Romano
    Abstract:

    The Mineral yuksporite (K,Ba)NaCa2(Si,Ti)4O11(F,OH)⋅H2O has been studied using the combination of SEM with EDX and vibrational spectroscopic techniques of Raman and infrared spectroscopy. Scanning electron microscopy shows a single pure phase with cleavage fragment up to 1.0 mm. Chemical analysis gave Si, Al, K, Na and Ti as the as major elements with small amounts of Mn, Ca, Fe and REE. Raman bands are observed at 808, 871, 930, 954, 980 and 1087 cm−1 and are typical bands for a natural zeolite. Intense Raman bands are observed at 514, 643 and 668 cm−1. A very sharp band is observed at 3668 cm−1 and is attributed to the OH stretching vibration of OH units associated with Si and Ti. Raman bands resolved at 3298, 3460, 3562 and 3628 cm−1 are assigned to water stretching vibrations.

Andrés López - One of the best experts on this subject based on the ideXlab platform.

  • raman and infrared spectroscopic characterization of the Silicate Mineral lamprophyllite
    Spectroscopy Letters, 2015
    Co-Authors: Ray L. Frost, Ricardo Scholz, Andrés López, Yunfei Xi
    Abstract:

    The Mineral lamprophyllite is fundamentally a Silicate based upon tetrahedral siloxane units with extensive substitution in the formula. Lamprophyllite is a complex group of soroSilicates with general chemical formula given as A2B4C2Si2O7(X)4, where the site A can be occupied by strontium, barium, sodium, and potassium; the B site is occupied by sodium, titanium, iron, manganese, magnesium, and calcium. The site C is mainly occupied by titanium or ferric iron and X includes the anions fluoride, hydroxyl, and oxide. Chemical composition shows a homogeneous phase, composed of Si, Na, Ti, and Fe. This complexity of formula is reflected in the complexity of both the Raman and infrared spectra. The Raman spectrum is characterized by intense bands at 918 and 940 cm−1. Other intense Raman bands are found at 576, 671, and 707 cm−1. These bands are assigned to the stretching and bending modes of the tetrahedral siloxane units.

  • a vibrational spectroscopic study of the Silicate Mineral harmotome ba na k 1 2 si al 8o16 6h2o a natural zeolite
    Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2015
    Co-Authors: Ray L. Frost, Antonio Wilson Romano, Andrés López, Lina Wang, Ricardo Scholz
    Abstract:

    Abstract The Mineral harmotome (Ba,Na,K)1-2(Si,Al)8O16⋅6H2O is a crystalline sodium calcium Silicate which has the potential to be used in plaster boards and other industrial applications. It is a natural zeolite with catalytic potential. Raman bands at 1020 and 1102 cm−1 are assigned to the SiO stretching vibrations of three dimensional siloxane units. Raman bands at 428, 470 and 491 cm−1 are assigned to OSiO bending modes. The broad Raman bands at around 699, 728, 768 cm−1 are attributed to water librational modes. Intense Raman bands in the 3100 to 3800 cm−1 spectral range are assigned to OH stretching vibrations of water in harmotome. Infrared spectra are in harmony with the Raman spectra. A sharp infrared band at 3731 cm−1 is assigned to the OH stretching vibration of SiOH units. Raman spectroscopy with complimentary infrared spectroscopy enables the characterization of the Silicate Mineral harmotome.

  • an sem eds and vibrational spectroscopic study of the Silicate Mineral meliphanite ca na 2be si al 2o6 f oh
    Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2015
    Co-Authors: Ray L. Frost, Antonio Wilson Romano, Andrés López, Frederick L Theiss, Ricardo Scholz
    Abstract:

    The Mineral meliphanite (Ca,Na)2Be[(Si,Al)2O6(F,OH)] is a crystalline sodium calcium beryllium Silicate which has the potential to be used as piezoelectric material and for other ferroelectric applications. The Mineral has been characterized by a combination of scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS) and vibrational spectroscopy. EDS analysis shows a material with high concentrations of Si and Ca and low amounts of Na, Al and F. Beryllium was not detected. Raman bands at 1016 and 1050 cm−1 are assigned to the SiO and AlOH stretching vibrations of three dimensional siloxane units. The infrared spectrum of meliphanite is very broad in comparison with the Raman spectrum. Raman bands at 472 and 510 cm−1 are assigned to OSiO bending modes. Raman spectroscopy identifies bands in the OH stretching region. Raman spectroscopy with complimentary infrared spectroscopy enables the characterization of the Silicate Mineral meliphanite.

  • an sem eds and vibrational spectroscopic study of the Silicate Mineral meliphanite ca na 2be si al 2o6 f oh
    Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2015
    Co-Authors: Ray L. Frost, Antonio Wilson Romano, Andrés López, Frederick L Theiss, Ricardo Scholz
    Abstract:

    The Mineral meliphanite (Ca,Na)2Be[(Si,Al)2O6(F,OH)] is a crystalline sodium calcium beryllium Silicate which has the potential to be used as piezoelectric material and for other ferroelectric applications. The Mineral has been characterized by a combination of scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS) and vibrational spectroscopy. EDS analysis shows a material with high concentrations of Si and Ca and low amounts of Na, Al and F. Beryllium was not detected. Raman bands at 1016 and 1050 cm−1 are assigned to the SiO and AlOH stretching vibrations of three dimensional siloxane units. The infrared spectrum of meliphanite is very broad in comparison with the Raman spectrum. Raman bands at 472 and 510 cm−1 are assigned to OSiO bending modes. Raman spectroscopy identifies bands in the OH stretching region. Raman spectroscopy with complimentary infrared spectroscopy enables the characterization of the Silicate Mineral meliphanite.

  • sem edx infrared and raman spectroscopic characterization of the Silicate Mineral yuksporite
    Science & Engineering Faculty, 2015
    Co-Authors: Ray L. Frost, Ricardo Scholz, Andrés López, Frederick L Theiss, Antonio Wilson Romano
    Abstract:

    The Mineral yuksporite (K,Ba)NaCa2(Si,Ti)4O11(F,OH)⋅H2O has been studied using the combination of SEM with EDX and vibrational spectroscopic techniques of Raman and infrared spectroscopy. Scanning electron microscopy shows a single pure phase with cleavage fragment up to 1.0 mm. Chemical analysis gave Si, Al, K, Na and Ti as the as major elements with small amounts of Mn, Ca, Fe and REE. Raman bands are observed at 808, 871, 930, 954, 980 and 1087 cm−1 and are typical bands for a natural zeolite. Intense Raman bands are observed at 514, 643 and 668 cm−1. A very sharp band is observed at 3668 cm−1 and is attributed to the OH stretching vibration of OH units associated with Si and Ti. Raman bands resolved at 3298, 3460, 3562 and 3628 cm−1 are assigned to water stretching vibrations.

Yunfei Xi - One of the best experts on this subject based on the ideXlab platform.

  • raman and infrared spectroscopic characterization of the Silicate Mineral lamprophyllite
    Spectroscopy Letters, 2015
    Co-Authors: Ray L. Frost, Ricardo Scholz, Andrés López, Yunfei Xi
    Abstract:

    The Mineral lamprophyllite is fundamentally a Silicate based upon tetrahedral siloxane units with extensive substitution in the formula. Lamprophyllite is a complex group of soroSilicates with general chemical formula given as A2B4C2Si2O7(X)4, where the site A can be occupied by strontium, barium, sodium, and potassium; the B site is occupied by sodium, titanium, iron, manganese, magnesium, and calcium. The site C is mainly occupied by titanium or ferric iron and X includes the anions fluoride, hydroxyl, and oxide. Chemical composition shows a homogeneous phase, composed of Si, Na, Ti, and Fe. This complexity of formula is reflected in the complexity of both the Raman and infrared spectra. The Raman spectrum is characterized by intense bands at 918 and 940 cm−1. Other intense Raman bands are found at 576, 671, and 707 cm−1. These bands are assigned to the stretching and bending modes of the tetrahedral siloxane units.

  • A vibrational spectroscopic study of the copper bearing Silicate Mineral luddenite
    Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2014
    Co-Authors: Ray L. Frost, Yunfei Xi, Andrés López, Ricardo Scholz
    Abstract:

    The molecular structure of the copper–lead Silicate Mineral luddenite has been analysed using vibrational spectroscopy. The Mineral is only one of many Silicate Minerals containing copper. The intense Raman band at 978 cm−1 is assigned to the ν1 (A1g) symmetric stretching vibration of Si5O14 units. Raman bands at 1122, 1148 and 1160 cm−1 are attributed to the ν3 SiO4 antisymmetric stretching vibrations. The bands in the 678–799 cm−1 are assigned to OSiO bending modes of the (SiO3)n chains. Raman bands at 3317 and 3329 cm−1 are attributed to water stretching bands. Bands at 3595 and 3629 cm−1 are associated with the stretching vibrations of hydroxyl units suggesting that hydroxyl units exist in the structure of luddenite.

  • Infrared and Raman Spectroscopic Characterization of the Silicate Mineral Gilalite Cu5Si6O17 · 7H2O
    Spectroscopy Letters, 2014
    Co-Authors: Andrés Lópes, Ricardo Scholz, Yunfei Xi, Ray L. Frost, Aline Amaral
    Abstract:

    ABSTRACT Gilalite is a copper Silicate Mineral with a general formula of Cu5Si6O17 · 7H2O. The Mineral is often found in association with another copper Silicate Mineral, apachite, Cu9Si10O29 · 11H2O. Raman and infrared spectroscopy have been used to characterize the molecular structure of gilalite. The structure of the Mineral shows disorder, which is reflected in the difficulty of obtaining quality Raman spectra. Raman spectroscopy clearly shows the absence of OH units in the gilalite structure. Intense Raman bands are observed at 1066, 1083, and 1160 cm−1. The Raman band at 853 cm−1 is assigned to the –SiO3 symmetrical stretching vibration and the low-intensity Raman bands at 914, 953, and 964 cm−1 may be ascribed to the antisymmetric SiO stretching vibrations. An intense Raman band at 673 cm−1 with a shoulder at 663 cm−1 is assigned to the ν4 Si-O-Si bending modes. Raman spectroscopy complemented with infrared spectroscopy enabled a better understanding of the molecular structure of gilalite.

  • a vibrational spectroscopic study of the Silicate Mineral ardennite as
    Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2014
    Co-Authors: Ray L. Frost, Ricardo Scholz, Andrés López, Yunfei Xi, Antonio Luciano Gandini
    Abstract:

    Abstract We have used a combination of scanning electron microscopy with EDX and vibrational spectroscopy to study the Mineral ardennite-(As). The Mineral ardennite-(As) of accepted formula Mn 4 2 + (Al,Mg)6(Si3O10)(SiO4)2(AsO4,VO4)(OH)6 is a Silicate Mineral which may contain arsenate and/or vanadates anions. Because of the oxyanions present, the Mineral lends itself to analysis by Raman and infrared spectroscopy. Qualitative chemical analysis shows a homogeneous phase, composed by Si, Mn, Al and As. Ca and V were also observed in partial substitution for Mn and As. Raman bands at 1197, 1225, 1287 and 1394 cm−1 are assigned to SiO stretching vibrations. The strong Raman bands at 779 and 877 cm−1 are assigned to the AsO 4 3 - antisymmetric and symmetric stretching vibrations. The Raman band at 352 cm−1 is assigned to the ν2 symmetric bending vibration. The series of Raman bands between 414 and 471 cm−1are assigned to the ν4 out of plane bending modes of the AsO 4 3 - units. Intense Raman bands observed at 301 and 314 cm−1 are attributed to the MnO stretching and bending vibrations. Raman bands at 3041, 3149, 3211 and 3298 cm−1 are attributed to the stretching vibrations of OH units. There is vibrational spectroscopic evidence for the presence of water adsorbed on the ardennite-(As) surfaces.

  • Infrared and raman spectroscopic characterization of the Silicate Mineral gilalite Cu5Si6O17.7H2O
    Science & Engineering Faculty, 2014
    Co-Authors: Andres Lopez Toro, Ricardo Scholz, Yunfei Xi, Ray L. Frost, Aline Amaral
    Abstract:

    Gilalite is a copper Silicate Mineral with a general formula of Cu5Si6O17 · 7H2O. The Mineral is often found in association with another copper Silicate Mineral, apachite, Cu9Si10O29 · 11H2O. Raman and infrared spectroscopy have been used to characterize the molecular structure of gilalite. The structure of the Mineral shows disorder, which is reflected in the difficulty of obtaining quality Raman spectra. Raman spectroscopy clearly shows the absence of OH units in the gilalite structure. Intense Raman bands are observed at 1066, 1083, and 1160 cm−1. The Raman band at 853 cm−1 is assigned to the –SiO3 symmetrical stretching vibration and the low-intensity Raman bands at 914, 953, and 964 cm−1 may be ascribed to the antisymmetric SiO stretching vibrations. An intense Raman band at 673 cm−1 with a shoulder at 663 cm−1 is assigned to the ν4 Si-O-Si bending modes. Raman spectroscopy complemented with infrared spectroscopy enabled a better understanding of the molecular structure of gilalite.

Frederick L Theiss - One of the best experts on this subject based on the ideXlab platform.

  • an sem eds and vibrational spectroscopic study of the Silicate Mineral meliphanite ca na 2be si al 2o6 f oh
    Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2015
    Co-Authors: Ray L. Frost, Antonio Wilson Romano, Andrés López, Frederick L Theiss, Ricardo Scholz
    Abstract:

    The Mineral meliphanite (Ca,Na)2Be[(Si,Al)2O6(F,OH)] is a crystalline sodium calcium beryllium Silicate which has the potential to be used as piezoelectric material and for other ferroelectric applications. The Mineral has been characterized by a combination of scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS) and vibrational spectroscopy. EDS analysis shows a material with high concentrations of Si and Ca and low amounts of Na, Al and F. Beryllium was not detected. Raman bands at 1016 and 1050 cm−1 are assigned to the SiO and AlOH stretching vibrations of three dimensional siloxane units. The infrared spectrum of meliphanite is very broad in comparison with the Raman spectrum. Raman bands at 472 and 510 cm−1 are assigned to OSiO bending modes. Raman spectroscopy identifies bands in the OH stretching region. Raman spectroscopy with complimentary infrared spectroscopy enables the characterization of the Silicate Mineral meliphanite.

  • an sem eds and vibrational spectroscopic study of the Silicate Mineral meliphanite ca na 2be si al 2o6 f oh
    Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2015
    Co-Authors: Ray L. Frost, Antonio Wilson Romano, Andrés López, Frederick L Theiss, Ricardo Scholz
    Abstract:

    The Mineral meliphanite (Ca,Na)2Be[(Si,Al)2O6(F,OH)] is a crystalline sodium calcium beryllium Silicate which has the potential to be used as piezoelectric material and for other ferroelectric applications. The Mineral has been characterized by a combination of scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS) and vibrational spectroscopy. EDS analysis shows a material with high concentrations of Si and Ca and low amounts of Na, Al and F. Beryllium was not detected. Raman bands at 1016 and 1050 cm−1 are assigned to the SiO and AlOH stretching vibrations of three dimensional siloxane units. The infrared spectrum of meliphanite is very broad in comparison with the Raman spectrum. Raman bands at 472 and 510 cm−1 are assigned to OSiO bending modes. Raman spectroscopy identifies bands in the OH stretching region. Raman spectroscopy with complimentary infrared spectroscopy enables the characterization of the Silicate Mineral meliphanite.

  • sem edx infrared and raman spectroscopic characterization of the Silicate Mineral yuksporite
    Science & Engineering Faculty, 2015
    Co-Authors: Ray L. Frost, Ricardo Scholz, Andrés López, Frederick L Theiss, Antonio Wilson Romano
    Abstract:

    The Mineral yuksporite (K,Ba)NaCa2(Si,Ti)4O11(F,OH)⋅H2O has been studied using the combination of SEM with EDX and vibrational spectroscopic techniques of Raman and infrared spectroscopy. Scanning electron microscopy shows a single pure phase with cleavage fragment up to 1.0 mm. Chemical analysis gave Si, Al, K, Na and Ti as the as major elements with small amounts of Mn, Ca, Fe and REE. Raman bands are observed at 808, 871, 930, 954, 980 and 1087 cm−1 and are typical bands for a natural zeolite. Intense Raman bands are observed at 514, 643 and 668 cm−1. A very sharp band is observed at 3668 cm−1 and is attributed to the OH stretching vibration of OH units associated with Si and Ti. Raman bands resolved at 3298, 3460, 3562 and 3628 cm−1 are assigned to water stretching vibrations.

  • sem edx infrared and raman spectroscopic characterization of the Silicate Mineral yuksporite
    Science & Engineering Faculty, 2015
    Co-Authors: Ray L. Frost, Ricardo Scholz, Andrés López, Frederick L Theiss, Antonio Wilson Romano
    Abstract:

    The Mineral yuksporite (K,Ba)NaCa2(Si,Ti)4O11(F,OH)⋅H2O has been studied using the combination of SEM with EDX and vibrational spectroscopic techniques of Raman and infrared spectroscopy. Scanning electron microscopy shows a single pure phase with cleavage fragment up to 1.0 mm. Chemical analysis gave Si, Al, K, Na and Ti as the as major elements with small amounts of Mn, Ca, Fe and REE. Raman bands are observed at 808, 871, 930, 954, 980 and 1087 cm−1 and are typical bands for a natural zeolite. Intense Raman bands are observed at 514, 643 and 668 cm−1. A very sharp band is observed at 3668 cm−1 and is attributed to the OH stretching vibration of OH units associated with Si and Ti. Raman bands resolved at 3298, 3460, 3562 and 3628 cm−1 are assigned to water stretching vibrations.

  • a vibrational spectroscopic study of the Silicate Mineral pectolite naca2si3o8 oh
    Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2015
    Co-Authors: Ray L. Frost, Antonio Wilson Romano, Andrés López, Frederick L Theiss, Ricardo Scholz
    Abstract:

    Abstract The Mineral pectolite NaCa 2 Si 3 O 8 (OH) is a crystalline sodium calcium Silicate which has the potential to be used in plaster boards and in other industrial applications. Raman bands at 974 and 1026 cm −1 are assigned to the SiO stretching vibrations of linked units of Si 3 O 8 units. Raman bands at 974 and 998 cm −1 serve to identify Si 3 O 8 units. The broad Raman band at around 936 cm −1 is attributed to hydroxyl deformation modes. Intense Raman band at 653 cm −1 is assigned to OSiO bending vibration. Intense Raman bands in the 2700–3000 cm −1 spectral range are assigned to OH stretching vibrations of the OH units in pectolite. Infrared spectra are in harmony with the Raman spectra. Raman spectroscopy with complimentary infrared spectroscopy enables the characterisation of the Silicate Mineral pectolite.