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Subsolidus Phase Equilibria in the System CaO–Al2O3–CoO and the Crystal Structure of Novel Ca3CoAl4O10

✍ Scribed by B. Vazquez; L.M. Torres-Martinez; N. Alvarez; J.F. Vente; P. Quintana

Publisher
Elsevier Science
Year
2002
Tongue
English
Weight
264 KB
Volume
166
Category
Article
ISSN
0022-4596

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✦ Synopsis

The subsolidus phase diagram, CaO+Al 2 O 3 +CoO, and its phase relations below 13003C have been studied in air. The stability regions of nine subsolidus compatibility triangles were established and a new ternary phase was found. The structure of this compound, Ca 3 CoAl 4 O 10 (orthorhombic, space group Pbc2 1 , a ‫؍‬ 5.1452(2) A > , b ‫؍‬ 16.7731(5) A > , c ‫؍‬ 10.7055(3) A > ), was determined from X-ray di4raction data and found to be isostructural with Ca 3 ZnAl 4 O 10 . This is an open framework compound with three crystallographically di4erent channels, each with a diameter of &3.5 A > . The two end members of the binary CoO+CaO system are surrounded by small regions of solid solutions. Lab color parameters were measured in several compositions. No ternary phases were found when Co was substituted by other divalent cations such as Sr,

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