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Journal of the Mexican Chemical Society
versão impressa ISSN 1870-249X
Resumo
CASTANEDA, Rodrigo; CHAVIRA, Elizabeth e PERALTA, Oscar. J. Mex. Chem. Soc [online]. 2014, vol.58, n.1, pp.82-87. ISSN 1870-249X.
Thermal analyses, X-ray diffraction (XRD), and HR-XRD (High Resolution XRD) were used to identify thermal behavior products in a family of solid-state reactions involving rare earth (REE) reagents. REE where sorted in light and heavy groups. The general reactions under study were: REE2O3 + Fe2O3+ As2O3 → 2REEFeO3 + As2O3↑and 2REE(OH)3 + Fe2O3 + As2O3 → 2REEFeO3 + As2O3↑ + 3H2O↑, REE= La, Ce, Nd, Sm, Gd, Dy, Ho, Er, and Yb. Based on the experimental results, it is possible to predict the different compounds of REE products in a series of reactions analyzing only three of the reactions, two for light REE and one for heavy REE.
Palavras-chave : Rare-earth; XRD; TG-DSC; solid-state reaction; thermal stability.