Thermal decomposition features of calcium and rare-earth oxalates
- Authors: Bushuev N.N.1, Zinin D.S.1
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Affiliations:
- Mendeleev University of Chemical Technology
- Issue: Vol 61, No 2 (2016)
- Pages: 161-167
- Section: Synthesis and Properties of Inorganic Compounds
- URL: https://journal-vniispk.ru/0036-0236/article/view/167115
- DOI: https://doi.org/10.1134/S0036023616020030
- ID: 167115
Cite item
Abstract
Thermal decomposition of Ln2(C2O4)3 · 9H2O concentrate (Ln = La, Ce, Pr, Nd) in the presence of CaC2O4 · H2O was studied by X-ray diffraction, thermogravimetry, and chemical analysis. Annealing at temperatures above 374°C in the absence of calcium oxalate gives rise to the solid solution of CeO2-based rare-earth oxides. Calcite CaCO3 is formed in the presence of calcium oxalate at annealing temperatures above 442°C, which impedes the formation of lanthanide oxide solid solution and favors crystallization of oxides as individual La2O3, CeO2, Pr6O11, and Nd2O3 phases. An increase in temperature above 736°C is accompanied by decomposition of calcium carbonate to give rise to an individual CaO phase and an individual phase of CeO2-based lanthanide oxide solid solution.
About the authors
N. N. Bushuev
Mendeleev University of Chemical Technology
Author for correspondence.
Email: nbushuev@muctr.ru
Russian Federation, Moscow
D. S. Zinin
Mendeleev University of Chemical Technology
Email: nbushuev@muctr.ru
Russian Federation, Moscow
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