The Experts below are selected from a list of 186 Experts worldwide ranked by ideXlab platform
Massao Ionashiro - One of the best experts on this subject based on the ideXlab platform.
-
Synthesis, thermal properties and spectroscopic study of solid mandelate of light trivalent lanthanides
Thermochimica Acta, 2012Co-Authors: A. C. Gigante, L. S. Lima, Flávio Junior Caires, D. J C Gomes, O. Treu-filho, Massao IonashiroAbstract:Characterization, thermal stability and thermal decomposition of light trivalent lanthanide mandelates Ln(C 6 H 5 CH(OH)CO 2 ) 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), experimental and theoretical infrared spectroscopy, elemental analysis, X-ray diffractometry, complexometry and TG–DSC coupled to FTIR. The dehydration of the lanthanum, samarium, europium and Gadolinium Compounds occurs in a single step while for praseodymium and neodymium ones it occurs in two consecutive steps. The thermal decomposition of the anhydrous Compounds occurs in three, four or five consecutive steps, with formation of the respective oxides CeO 2 , Pr 6 O 11 and Ln 2 O 3 (Ln = La, Nd to Gd) as final residues. The results also provide information concerning the composition, thermal behavior and gaseous products evolved during the thermal decomposition of these Compounds. The theoretical and experimental spectroscopic data suggest the possible modes of coordination of the ligand with the lanthanum.
-
Synthesis, characterization and thermal behaviour of solid-state Compounds of light trivalent lanthanide succinates
Thermochimica Acta, 2010Co-Authors: L. S. Lima, Flávio Junior Caires, C. T. Carvalho, Adriano Buzutti De Siqueira, 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.
L. S. Lima - One of the best experts on this subject based on the ideXlab platform.
-
Synthesis, thermal properties and spectroscopic study of solid mandelate of light trivalent lanthanides
Thermochimica Acta, 2012Co-Authors: A. C. Gigante, L. S. Lima, Flávio Junior Caires, D. J C Gomes, O. Treu-filho, Massao IonashiroAbstract:Characterization, thermal stability and thermal decomposition of light trivalent lanthanide mandelates Ln(C 6 H 5 CH(OH)CO 2 ) 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), experimental and theoretical infrared spectroscopy, elemental analysis, X-ray diffractometry, complexometry and TG–DSC coupled to FTIR. The dehydration of the lanthanum, samarium, europium and Gadolinium Compounds occurs in a single step while for praseodymium and neodymium ones it occurs in two consecutive steps. The thermal decomposition of the anhydrous Compounds occurs in three, four or five consecutive steps, with formation of the respective oxides CeO 2 , Pr 6 O 11 and Ln 2 O 3 (Ln = La, Nd to Gd) as final residues. The results also provide information concerning the composition, thermal behavior and gaseous products evolved during the thermal decomposition of these Compounds. The theoretical and experimental spectroscopic data suggest the possible modes of coordination of the ligand with the lanthanum.
-
Synthesis, characterization and thermal behaviour of solid-state Compounds of light trivalent lanthanide succinates
Thermochimica Acta, 2010Co-Authors: L. S. Lima, Flávio Junior Caires, C. T. Carvalho, Adriano Buzutti De Siqueira, 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.
Mario Maglione - One of the best experts on this subject based on the ideXlab platform.
-
The Ba2LnFeNb4O15 “tetragonal tungsten bronze”: Towards RT composite multiferroics
Solid State Sciences, 2009Co-Authors: Michaël Josse, O. Bidault, F. Roulland, Elias Castel, Annie Simon, Dominique Michau, R. Von Der Mühll, Mario MaglioneAbstract:Several Niobium oxides of formula Ba_2LnFeNb_4O_{15} (Ln = La, Pr, Nd, Sm, Eu, Gd) with the Tetragonal Tungsten Bronze (TTB) structure have been synthesised by conventional solid-state methods. The Neodymium, Samarium and Europium Compounds are ferroelectric with Curie temperature ranging from 320 to 440K. The Praseodymium and Gadolinium compound behave as relaxors below 170 and 300 K respectively. The high temperature magnetic susceptibility of the Praseodymium, Neodymium, Samarium, Europium and Gadolinium Compounds indicate that they are ferro or ferrimagnetically ordered below Curie temperatures ranging from 680 to 720K. Both ferroelectric and magnetic hysteresis loops are reported at room temperature, thus confirming the multiferroic behaviour of these Compounds. Crystal-chemical analysis suggests a close relationship between the distortion of the TTB framework induced by the rare earth and the multiferroic properties.
-
The Ba2LnFeNb4O15 Tetragonal Tungsten Bronze: towards RT composite multiferroics
arXiv: Materials Science, 2007Co-Authors: Michaël Josse, O. Bidault, F. Roulland, Elias Castel, Annie Simon, Dominique Michau, R. Von Der Mühll, O. Nguyen, Mario MaglioneAbstract:Several Niobium oxides of formula Ba2LnFeNb4O15 (Ln = La, Pr, Nd, Sm, Eu, Gd) with the Tetragonal Tungsten Bronze (TTB) structure have been synthesised by conventional solid-state methods. The Neodymium, Samarium and Europium Compounds are ferroelectric with Curie temperature ranging from 320 to 440K. The Praseodymium and Gadolinium Compounds behave as relaxors below 170 and 300 K respectively. The Praseodymium, Neodymium, Samarium, Europium and Gadolinium Compounds exhibit magnetic hysteresis loops at room temperature originating from traces of a barium ferrite secondary phase. The presence of both ferroelectric and magnetic hysteresis loops at room temperature allows considering these materials as composites multiferroic. Based on crystal-chemical analysis we propose some relationships between the introduction of Ln3+ ions in the TTB framework and the chemical, structural and physical properties of these materials.
Flávio Junior Caires - One of the best experts on this subject based on the ideXlab platform.
-
Synthesis, thermal properties and spectroscopic study of solid mandelate of light trivalent lanthanides
Thermochimica Acta, 2012Co-Authors: A. C. Gigante, L. S. Lima, Flávio Junior Caires, D. J C Gomes, O. Treu-filho, Massao IonashiroAbstract:Characterization, thermal stability and thermal decomposition of light trivalent lanthanide mandelates Ln(C 6 H 5 CH(OH)CO 2 ) 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), experimental and theoretical infrared spectroscopy, elemental analysis, X-ray diffractometry, complexometry and TG–DSC coupled to FTIR. The dehydration of the lanthanum, samarium, europium and Gadolinium Compounds occurs in a single step while for praseodymium and neodymium ones it occurs in two consecutive steps. The thermal decomposition of the anhydrous Compounds occurs in three, four or five consecutive steps, with formation of the respective oxides CeO 2 , Pr 6 O 11 and Ln 2 O 3 (Ln = La, Nd to Gd) as final residues. The results also provide information concerning the composition, thermal behavior and gaseous products evolved during the thermal decomposition of these Compounds. The theoretical and experimental spectroscopic data suggest the possible modes of coordination of the ligand with the lanthanum.
-
Synthesis, characterization and thermal behaviour of solid-state Compounds of light trivalent lanthanide succinates
Thermochimica Acta, 2010Co-Authors: L. S. Lima, Flávio Junior Caires, C. T. Carvalho, Adriano Buzutti De Siqueira, 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.
A. C. Gigante - One of the best experts on this subject based on the ideXlab platform.
-
Synthesis, thermal properties and spectroscopic study of solid mandelate of light trivalent lanthanides
Thermochimica Acta, 2012Co-Authors: A. C. Gigante, L. S. Lima, Flávio Junior Caires, D. J C Gomes, O. Treu-filho, Massao IonashiroAbstract:Characterization, thermal stability and thermal decomposition of light trivalent lanthanide mandelates Ln(C 6 H 5 CH(OH)CO 2 ) 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), experimental and theoretical infrared spectroscopy, elemental analysis, X-ray diffractometry, complexometry and TG–DSC coupled to FTIR. The dehydration of the lanthanum, samarium, europium and Gadolinium Compounds occurs in a single step while for praseodymium and neodymium ones it occurs in two consecutive steps. The thermal decomposition of the anhydrous Compounds occurs in three, four or five consecutive steps, with formation of the respective oxides CeO 2 , Pr 6 O 11 and Ln 2 O 3 (Ln = La, Nd to Gd) as final residues. The results also provide information concerning the composition, thermal behavior and gaseous products evolved during the thermal decomposition of these Compounds. The theoretical and experimental spectroscopic data suggest the possible modes of coordination of the ligand with the lanthanum.
