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Phase Relations in the System In2O3–TiO2–Fe2O3at 1100°C in Air

✍ Scribed by Francisco Brown; Maria J.R Flores; Noboru Kimizuka; Yuichi Michiue; Mitsuko Onoda; Takahiko Mohri; Masaki Nakamura; Nobuo Ishizawa

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
221 KB
Volume
144
Category
Article
ISSN
0022-4596

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✦ Synopsis

3 ‫؍‬ 0.384:0.464:0.152 (mole ratio) on the line ''InFeO 3 ''-''In 2 Ti 2 O 7 .'' The crystal structures of In 3 Ti 2 FeO 10 are pyrochlore related with a m ‫؍‬ 5.9171 (5) A s , b m ‫؍‬ 3.3696 (3) A s , c m ‫؍‬ 6.3885 (6) A s , and ‫؍‬ 108.02 (1)°in a monoclinic crystal system at 1100°C, and a 0 ‫؍‬ 5.9089 (5) A s , b 0 ‫؍‬ 3.3679 (3) A s , and c 0 ‫؍‬ 12.130 (1) A s in an orthorhombic system at 1200°C. The relationship between the lattice constants of these phases and those of the cubic pyrochlore type are approximately as follows:

) c p and ‫؍‬ 109.47°in the monoclinic system, and

) c p , and c 0 ‫؍‬ 2 3 a p ؉ (؊ 2 3 ) bp؉ ( 23 ) c p in the orthorhombic system, where a p ‫؍‬ b p ‫؍‬ c p ‫؍‬ 9.90 (A s ) are the lattice constants of ''In 2 Ti 2 O 7 '' having the cubic pyrochlore type. All solid solutions of In 3 Ti 2 FeO 10 have incommensurate structures with a periodicity of q ؋ b* (q ‫؍‬ 0.281-0.356) along the b* axis and the stoichiometric phase has q ‫؍‬ 1 3 . InFeO 3 having a layered structure type is unstable between 750 and 1100°C.

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