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Formation of oxysulfide LnO(2)S(2) and oxysulfate LnO(2)SO(4) phases in the thermal decomposition process of lanthanide sulfonates (Ln = La, Sm)

By Luiz Carlos Machado, Marcos Tadeu D'Orlando de Azeredo, Hamilton Perez Soares Correa, Jivaldo do Rosario Matos and Italo Odone Mazali

Abstract

This study investigates two lanthanide compounds (La(3+) and Sm(3+)) obtained in water/ethyl alcohol solutions employing the anionic surfactant diphenyl-4-amine sulfonate (DAS) as ligand. Both sulfonates were characterized through IR, TG/DTG (O(2) and N(2)). The thermal treatment of both compounds at 1273 K under air leaves residues containing variable percentages of lanthanide oxysulfide/oxysulfate phases shown by synchrotron high-resolution XRD pattern including the Rietveld analysis. The phase distributions found in the residues evidence the differences in the relative stability of the precursors

Topics: Sulfonates, Thermal decomposition, Rietveld analysis, OXYSULFATE/OXYSULFIDE SYSTEMS, POWDER DIFFRACTION, REFINEMENT, BEHAVIOR, OXIDE
Publisher: Springer
Year: 2013
OAI identifier: oai:agregador.ibict.br.RI_UNICAMP:oai:unicamp.sibi.usp.br:SBURI/2032
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