Abstract

CASTANEDA, Rodrigo; CHAVIRA, Elizabeth  and  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.

Keywords : Rare-earth; XRD; TG-DSC; solid-state reaction; thermal stability.

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