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The Phase Diagram CaO–Al2O3–Ta2O5and the Crystal Structures of Ca2AlTaO6and CaAlTaO5

✍ Scribed by M. Sales; G. Eguia; P. Quintana; L.M. Torres-Martinez; A.R. West

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
259 KB
Volume
143
Category
Article
ISSN
0022-4596

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✦ Synopsis

The subsolidus phase diagram CaO-Al 2 O 3 -Ta 2 O 5 has been determined at 1300-1350°C. Two ternary phases are present, Ca 2 AlTaO 6 and the new phase, CaAlTaO 5 . From Rietveld refinement of powder X-ray diffraction data, CaAlTaO 5 has the sphene structure, monoclinic 6.6760(3), 8.9546(3), 7.3494(3) A s , ‫890.411؍‬ (3)°, space group C2/c, and Ca 2 AlTaO 6 has a partially ordered double perovskite structure, monoclinic 5.3915(3), 5.4321(4), 7.6508(4) A s , ‫,°)5(670.09؍‬ space group P2 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.

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