Artículos de revistas
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)
Fecha
2012Registro en:
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY, DORDRECHT, v. 107, n. 1, pp. 305-311, JAN, 2012
1388-6150
10.1007/s10973-011-1451-7
Autor
Machado, Luiz Carlos
D'Orlando de Azeredo, Marcos Tadeu
Correa, Hamilton Perez Soares
Matos, Jivaldo do Rosário
Mazali, Italo Odone
Institución
Resumen
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.