The Experts below are selected from a list of 891 Experts worldwide ranked by ideXlab platform
Massao Ionashiro - One of the best experts on this subject based on the ideXlab platform.
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thermal behavior spectroscopic study and evolved gas analysis ega during pyrolysis of picolinic acid sodium picolinate and its light trivalent lanthanide complexes in solid state
Journal of Analytical and Applied Pyrolysis, 2016Co-Authors: A Do L C S Nascimento, Flávio Junior Caires, Jose Augusto Teixeira, Wilhan Donizete Goncalves Nunes, Francisco Xavier De Campos, O Treufilho, Massao IonashiroAbstract:Abstract Synthesis, characterization, and thermal behavior of light trivalent lanthanide picolinate (La–Gd, except Pm) as well as the thermal behavior of picolinic acid and its sodium salt were investigated employing elemental analysis, complexometry, differential scanning calorimetry (DSC), simultaneous thermogravimetry and differential scanning calorimetry (TG-DSC), infrared spectroscopy (FTIR), X-ray power diffractometry, and evolved gas analysis (EGA) for TG-DSC coupled to FTIR. All the synthesized compounds were obtained in the anhydrous state and the thermal decomposition in dynamic dry air atmosphere occured in a single step or two consecutive steps with formation of the respective oxides, CeO 2 , Pr 6 O 11 and Ln 2 O 3 (Ln = La, Nd to Gd). In dynamic dry nitrogen atmosphere the thermal decomposition occured in two or three consecutive steps and mass loss was observed up to 1000 °C. The EGA data allowed the identification of gaseous products evolved during pyrolysis and oxidative decomposition. The results of density functional theory (DFT) and FTIR also provided information on the ligand’s Denticity.
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synthesis characterization and thermal behavior of solid state compounds of heavy trivalent lanthanide succinates
Thermochimica Acta, 2013Co-Authors: L. S. Lima, Cláudio Teodoro De Carvalho, Adriano Buzutti De Siqueira, Flávio Junior Caires, A C Gigante, D J C Gomes, Massao IonashiroAbstract:Abstract Solid-state Ln–L compounds, where Ln stands for heavy trivalent lanthanides or yttrium(III) (Tb–Lu, Y) and L is succinate, have been synthesized. Simultaneous thermogravimetry and differential thermal analysis (TG-DTA), differential scanning calorimetry (DSC), infrared spectroscopy, TG-DTA coupled to FTIR, elemental analysis, X-ray powder diffractometry and complexometry were used to characterize and study the thermal behavior of these compounds. For the terbium to thulium and yttrium compounds, the dehydration, as well the thermal decomposition of the anhydrous compound occurs in two consecutive steps, while ytterbium and lutetium the dehydration occurs in a single step. The results also led to information about the ligand's Denticity, thermal stability and thermal decomposition of these compounds.
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synthesis characterization and thermal study of solid mandelate of some bivalent transition metal ions in co2 and n2 atmospheres
Journal of Thermal Analysis and Calorimetry, 2013Co-Authors: D J C Gomes, Flávio Junior Caires, L. S. Lima, A C Gigante, Massao IonashiroAbstract:Solid state M-L, where M stands for bivalent transition metals (Mn(II), Fe(II), Co(II), Ni(II), Cu(II) and Zn(II)) and L is mandelate, were synthesized. Simultaneous thermogravimetry and differential scanning calorimetry, elemental analysis and complexometry were used to establish the stoichiometry and to study the thermal behaviour of these compounds in CO2 and N2 atmospheres. The results show that all the compounds were obtained in the anhydrous state and in agreement with the general formula ML2. The thermal decomposition of the compounds occurs in a single (Cu(II)), two (Ni(II)) three (Fe(II), Co(II)), four (Mn(II)) and five (Zn(II)) steps. The results also provided information concerning the ligand’s Denticity, thermal behaviour, final residues and identification of gaseous products evolved during the thermal decomposition of these compounds.
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Synthesis, characterization and thermal behaviour of solid-state compounds of light trivalent lanthanide succinates
Thermochimica Acta, 2010Co-Authors: L. S. Lima, Cláudio Teodoro De Carvalho, Adriano Buzutti De Siqueira, Flávio Junior Caires, Massao IonashiroAbstract:Abstract Characterization, thermal stability and thermal decomposition of light trivalent lanthanide succinates, Ln 2 (C 4 H 4 O 4 ) 3 · n H 2 O (Ln = La to Gd, except Pm) were investigated employing simultaneous thermogravimetry and differential thermal analysis (TG-DTA), differential scanning calorimetry (DSC), infrared spectroscopy, TG-FTIR system, elemental analysis and complexometry. The dehydration of the lanthanum and cerium compounds occurs in a single step, while for the praseodymium to gadolinium compounds the dehydration occurs in two consecutive steps. The thermal decomposition of the anhydrous compounds occurs in consecutive and/or overlapping steps, except for the cerium compound, with formation of the respective oxides, CeO 2 , Pr 6 O 11 and Ln 2 O 3 (Ln = La, Nd to Gd), as final residue. The results also provided information concerning the Denticity of the ligand and thermal behaviour of these compounds.
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Synthesis, characterization and thermal behaviour of heavy lanthanide and yttrium pyruvates in the solid state
Journal of Thermal Analysis and Calorimetry, 2009Co-Authors: Adriano Buzutti De Siqueira, Cláudio Teodoro De Carvalho, E. C. Rodrigues, E. Y. Ionashiro, Gilbert Bannach, Massao IonashiroAbstract:Solid-state Ln–L compounds, where Ln stands for heavy trivalent lanthanides or yttrium (III) (Tb–Lu, Y) and where L is pyruvate, have been synthesized. Thermogravimetry and derivative thermogravimetry (TG/DTG), differential scanning calorimetry (DSC), X-Ray powder diffractometry, infrared spectroscopy, elemental analysis and complexometry were used to characterize and to study the thermal behaviour of these compounds. The results led to information about the composition, dehydration, thermal behaviour, ligand Denticity of the isolated complexes.
Shiv P Halasyamani - One of the best experts on this subject based on the ideXlab platform.
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rbmgco3f a new beryllium free deep ultraviolet nonlinear optical material
Journal of the American Chemical Society, 2015Co-Authors: Thao T Tran, Jiangang He, James M Rondinelli, Shiv P HalasyamaniAbstract:A new deep-ultraviolet nonlinear optical material, RbMgCO3F, has been synthesized and characterized. The achiral nonpolar acentric material is second harmonic generation (SHG) active at both 1064 and 532 nm, with efficiencies of 160 × α-SiO2 and 0.6 × β-BaB2O4, respectively, and exhibits a short UV cutoff, below 190 nm. RbMgCO3F possesses a three-dimensional structure of corner-shared Mg(CO3)2F2 polyhedra. Unlike other acentric carbonate fluorides, in this example, the inclusion of Mg2+ creates pentagonal channels where the Rb+ resides. Our electronic structure calculations reveal that the Denticity of the carbonate linkage, monodentate or bidendate, to the divalent cation is a useful parameter for tuning the transparency window and achieving the sizable SHG response.
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RbMgCO3F: A New Beryllium-Free Deep-Ultraviolet Nonlinear Optical Material
2015Co-Authors: Thao T Tran, James M Rondinelli, Shiv P HalasyamaniAbstract:A new deep-ultraviolet nonlinear optical material, RbMgCO3F, has been synthesized and characterized. The achiral nonpolar acentric material is second harmonic generation (SHG) active at both 1064 and 532 nm, with efficiencies of 160 × α-SiO2 and 0.6 × β-BaB2O4, respectively, and exhibits a short UV cutoff, below 190 nm. RbMgCO3F possesses a three-dimensional structure of corner-shared Mg(CO3)2F2 polyhedra. Unlike other acentric carbonate fluorides, in this example, the inclusion of Mg2+ creates pentagonal channels where the Rb+ resides. Our electronic structure calculations reveal that the Denticity of the carbonate linkage, monodentate or bidendate, to the divalent cation is a useful parameter for tuning the transparency window and achieving the sizable SHG response
L. S. Lima - One of the best experts on this subject based on the ideXlab platform.
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synthesis characterization and thermal behavior of solid state compounds of heavy trivalent lanthanide succinates
Thermochimica Acta, 2013Co-Authors: L. S. Lima, Cláudio Teodoro De Carvalho, Adriano Buzutti De Siqueira, Flávio Junior Caires, A C Gigante, D J C Gomes, Massao IonashiroAbstract:Abstract Solid-state Ln–L compounds, where Ln stands for heavy trivalent lanthanides or yttrium(III) (Tb–Lu, Y) and L is succinate, have been synthesized. Simultaneous thermogravimetry and differential thermal analysis (TG-DTA), differential scanning calorimetry (DSC), infrared spectroscopy, TG-DTA coupled to FTIR, elemental analysis, X-ray powder diffractometry and complexometry were used to characterize and study the thermal behavior of these compounds. For the terbium to thulium and yttrium compounds, the dehydration, as well the thermal decomposition of the anhydrous compound occurs in two consecutive steps, while ytterbium and lutetium the dehydration occurs in a single step. The results also led to information about the ligand's Denticity, thermal stability and thermal decomposition of these compounds.
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synthesis characterization and thermal study of solid mandelate of some bivalent transition metal ions in co2 and n2 atmospheres
Journal of Thermal Analysis and Calorimetry, 2013Co-Authors: D J C Gomes, Flávio Junior Caires, L. S. Lima, A C Gigante, Massao IonashiroAbstract:Solid state M-L, where M stands for bivalent transition metals (Mn(II), Fe(II), Co(II), Ni(II), Cu(II) and Zn(II)) and L is mandelate, were synthesized. Simultaneous thermogravimetry and differential scanning calorimetry, elemental analysis and complexometry were used to establish the stoichiometry and to study the thermal behaviour of these compounds in CO2 and N2 atmospheres. The results show that all the compounds were obtained in the anhydrous state and in agreement with the general formula ML2. The thermal decomposition of the compounds occurs in a single (Cu(II)), two (Ni(II)) three (Fe(II), Co(II)), four (Mn(II)) and five (Zn(II)) steps. The results also provided information concerning the ligand’s Denticity, thermal behaviour, final residues and identification of gaseous products evolved during the thermal decomposition of these compounds.
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Synthesis, characterization and thermal behaviour of solid-state compounds of light trivalent lanthanide succinates
Thermochimica Acta, 2010Co-Authors: L. S. Lima, Cláudio Teodoro De Carvalho, Adriano Buzutti De Siqueira, Flávio Junior Caires, Massao IonashiroAbstract:Abstract Characterization, thermal stability and thermal decomposition of light trivalent lanthanide succinates, Ln 2 (C 4 H 4 O 4 ) 3 · n H 2 O (Ln = La to Gd, except Pm) were investigated employing simultaneous thermogravimetry and differential thermal analysis (TG-DTA), differential scanning calorimetry (DSC), infrared spectroscopy, TG-FTIR system, elemental analysis and complexometry. The dehydration of the lanthanum and cerium compounds occurs in a single step, while for the praseodymium to gadolinium compounds the dehydration occurs in two consecutive steps. The thermal decomposition of the anhydrous compounds occurs in consecutive and/or overlapping steps, except for the cerium compound, with formation of the respective oxides, CeO 2 , Pr 6 O 11 and Ln 2 O 3 (Ln = La, Nd to Gd), as final residue. The results also provided information concerning the Denticity of the ligand and thermal behaviour of these compounds.
Thao T Tran - One of the best experts on this subject based on the ideXlab platform.
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rbmgco3f a new beryllium free deep ultraviolet nonlinear optical material
Journal of the American Chemical Society, 2015Co-Authors: Thao T Tran, Jiangang He, James M Rondinelli, Shiv P HalasyamaniAbstract:A new deep-ultraviolet nonlinear optical material, RbMgCO3F, has been synthesized and characterized. The achiral nonpolar acentric material is second harmonic generation (SHG) active at both 1064 and 532 nm, with efficiencies of 160 × α-SiO2 and 0.6 × β-BaB2O4, respectively, and exhibits a short UV cutoff, below 190 nm. RbMgCO3F possesses a three-dimensional structure of corner-shared Mg(CO3)2F2 polyhedra. Unlike other acentric carbonate fluorides, in this example, the inclusion of Mg2+ creates pentagonal channels where the Rb+ resides. Our electronic structure calculations reveal that the Denticity of the carbonate linkage, monodentate or bidendate, to the divalent cation is a useful parameter for tuning the transparency window and achieving the sizable SHG response.
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RbMgCO3F: A New Beryllium-Free Deep-Ultraviolet Nonlinear Optical Material
2015Co-Authors: Thao T Tran, James M Rondinelli, Shiv P HalasyamaniAbstract:A new deep-ultraviolet nonlinear optical material, RbMgCO3F, has been synthesized and characterized. The achiral nonpolar acentric material is second harmonic generation (SHG) active at both 1064 and 532 nm, with efficiencies of 160 × α-SiO2 and 0.6 × β-BaB2O4, respectively, and exhibits a short UV cutoff, below 190 nm. RbMgCO3F possesses a three-dimensional structure of corner-shared Mg(CO3)2F2 polyhedra. Unlike other acentric carbonate fluorides, in this example, the inclusion of Mg2+ creates pentagonal channels where the Rb+ resides. Our electronic structure calculations reveal that the Denticity of the carbonate linkage, monodentate or bidendate, to the divalent cation is a useful parameter for tuning the transparency window and achieving the sizable SHG response
Flávio Junior Caires - One of the best experts on this subject based on the ideXlab platform.
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thermal behavior spectroscopic study and evolved gas analysis ega during pyrolysis of picolinic acid sodium picolinate and its light trivalent lanthanide complexes in solid state
Journal of Analytical and Applied Pyrolysis, 2016Co-Authors: A Do L C S Nascimento, Flávio Junior Caires, Jose Augusto Teixeira, Wilhan Donizete Goncalves Nunes, Francisco Xavier De Campos, O Treufilho, Massao IonashiroAbstract:Abstract Synthesis, characterization, and thermal behavior of light trivalent lanthanide picolinate (La–Gd, except Pm) as well as the thermal behavior of picolinic acid and its sodium salt were investigated employing elemental analysis, complexometry, differential scanning calorimetry (DSC), simultaneous thermogravimetry and differential scanning calorimetry (TG-DSC), infrared spectroscopy (FTIR), X-ray power diffractometry, and evolved gas analysis (EGA) for TG-DSC coupled to FTIR. All the synthesized compounds were obtained in the anhydrous state and the thermal decomposition in dynamic dry air atmosphere occured in a single step or two consecutive steps with formation of the respective oxides, CeO 2 , Pr 6 O 11 and Ln 2 O 3 (Ln = La, Nd to Gd). In dynamic dry nitrogen atmosphere the thermal decomposition occured in two or three consecutive steps and mass loss was observed up to 1000 °C. The EGA data allowed the identification of gaseous products evolved during pyrolysis and oxidative decomposition. The results of density functional theory (DFT) and FTIR also provided information on the ligand’s Denticity.
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synthesis characterization and thermal behavior of solid state compounds of heavy trivalent lanthanide succinates
Thermochimica Acta, 2013Co-Authors: L. S. Lima, Cláudio Teodoro De Carvalho, Adriano Buzutti De Siqueira, Flávio Junior Caires, A C Gigante, D J C Gomes, Massao IonashiroAbstract:Abstract Solid-state Ln–L compounds, where Ln stands for heavy trivalent lanthanides or yttrium(III) (Tb–Lu, Y) and L is succinate, have been synthesized. Simultaneous thermogravimetry and differential thermal analysis (TG-DTA), differential scanning calorimetry (DSC), infrared spectroscopy, TG-DTA coupled to FTIR, elemental analysis, X-ray powder diffractometry and complexometry were used to characterize and study the thermal behavior of these compounds. For the terbium to thulium and yttrium compounds, the dehydration, as well the thermal decomposition of the anhydrous compound occurs in two consecutive steps, while ytterbium and lutetium the dehydration occurs in a single step. The results also led to information about the ligand's Denticity, thermal stability and thermal decomposition of these compounds.
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synthesis characterization and thermal study of solid mandelate of some bivalent transition metal ions in co2 and n2 atmospheres
Journal of Thermal Analysis and Calorimetry, 2013Co-Authors: D J C Gomes, Flávio Junior Caires, L. S. Lima, A C Gigante, Massao IonashiroAbstract:Solid state M-L, where M stands for bivalent transition metals (Mn(II), Fe(II), Co(II), Ni(II), Cu(II) and Zn(II)) and L is mandelate, were synthesized. Simultaneous thermogravimetry and differential scanning calorimetry, elemental analysis and complexometry were used to establish the stoichiometry and to study the thermal behaviour of these compounds in CO2 and N2 atmospheres. The results show that all the compounds were obtained in the anhydrous state and in agreement with the general formula ML2. The thermal decomposition of the compounds occurs in a single (Cu(II)), two (Ni(II)) three (Fe(II), Co(II)), four (Mn(II)) and five (Zn(II)) steps. The results also provided information concerning the ligand’s Denticity, thermal behaviour, final residues and identification of gaseous products evolved during the thermal decomposition of these compounds.
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Synthesis, characterization and thermal behaviour of solid-state compounds of light trivalent lanthanide succinates
Thermochimica Acta, 2010Co-Authors: L. S. Lima, Cláudio Teodoro De Carvalho, Adriano Buzutti De Siqueira, Flávio Junior Caires, Massao IonashiroAbstract:Abstract Characterization, thermal stability and thermal decomposition of light trivalent lanthanide succinates, Ln 2 (C 4 H 4 O 4 ) 3 · n H 2 O (Ln = La to Gd, except Pm) were investigated employing simultaneous thermogravimetry and differential thermal analysis (TG-DTA), differential scanning calorimetry (DSC), infrared spectroscopy, TG-FTIR system, elemental analysis and complexometry. The dehydration of the lanthanum and cerium compounds occurs in a single step, while for the praseodymium to gadolinium compounds the dehydration occurs in two consecutive steps. The thermal decomposition of the anhydrous compounds occurs in consecutive and/or overlapping steps, except for the cerium compound, with formation of the respective oxides, CeO 2 , Pr 6 O 11 and Ln 2 O 3 (Ln = La, Nd to Gd), as final residue. The results also provided information concerning the Denticity of the ligand and thermal behaviour of these compounds.