The phase diagram CaO-Al{sub 2}O{sub 3}-Ta{sub 2}O{sub 5} and the crystal structures of Ca{sub 2}AlTaO{sub 6} and CaAlTaO{sub 5}
Journal Article
·
· Journal of Solid State Chemistry
- Univ. of Aberdeen (United Kingdom). Dept. of Chemistry
- Univ. Autonoma de Nuevo Leon, Monterrey (Mexico). Facultad de Ciencias Quimicas
- CINVESTAV IPN-Unidad Merida (Mexico)
The subsolidus phase diagram CaO-Al{sub 2}O{sub 3}-Ta{sub 2}O{sub 5} has been determined at 1300--1350 C. Two ternary phases are present, Ca{sub 2}AlTaO{sub 6} and the new phase, CaAlTaO{sub 5}. From Rietveld refinement of powder X-ray diffraction data, CaAlTaO{sub 5} has the sphene structure, monoclinic 6.6760(3), 8.9546(3), 7.3494(3) {angstrom}, {beta} = 114.098 (3){degree}, space group C2/c, and Ca{sub 2}AlTaO{sub 6} has a partially ordered double perovskite structure, monoclinic 5.3915(3), 5.4321(4), 7.6508(4) {angstrom}, {beta} = 90.076(5){degree}, space group P2{sub 1}/c. The Al and Ta cations form a rock-salt-type arrangement with 3% cross substitution of Al on Ta sites and vice versa.
- OSTI ID:
- 349914
- Journal Information:
- Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 1 Vol. 143; ISSN 0022-4596; ISSN JSSCBI
- Country of Publication:
- United States
- Language:
- English
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