Thermal decomposition features of calcium and rare-earth oxalates
| Autor: | D. S. Zinin, N. N. Bushuev |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Lanthanide
Materials science Materials Science (miscellaneous) Thermal decomposition Inorganic chemistry Oxide chemistry.chemical_element 02 engineering and technology Calcium 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences law.invention Inorganic Chemistry Thermogravimetry chemistry.chemical_compound Calcium carbonate chemistry law Physical and Theoretical Chemistry Crystallization 0210 nano-technology Solid solution |
| Zdroj: | Russian Journal of Inorganic Chemistry. 61:161-167 |
| ISSN: | 1531-8613 0036-0236 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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