Synthesis and dehydration of double oxalates of rare earths(III) with some monovalent metals期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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Synthesis and dehydration of double oxalates of rare earths(III) with some monovalent metals

Authors:	O Gen?ova J ?iftar

Institution:	(1) Institute of Chemistry, Faculty of Science, St. Cyril and Methodius University, 91000 Skopje, Macedonia;(2) Department of Chemistry and Chemical Technology, University of Ljubljana, Ljubljana, Slovenia

Abstract:	The synthesis of double oxalates of rare earths(III) and potassium with empirical formulae K₄Ln₂(C₂O₄)₅·10H₂O (Ln=La, Ce) and KLn(C₂O₄)₂· nH₂O (wheren=4 for Pr-Dy andn=4.5 for Ho-Lu, Y) is described. The compounds obtained were studied by TG, DTG and DTA over the temperature interval 25–500C and by X-ray powder diffraction and chemical analysis. Three structurally different groups were recognized. It was found that either rare earth oxide or basic carbonate (Ln₂O₂·CO₃) and potassium carbonate were obtained as final product at 500C, depending on the rare earth element. The thermal decomposition takes place in two well-resolved stages.

Keywords:	double oxalates potassium rare earths (lanthanons)
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