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Formation, Transformation, and Decomposition of Y 2 TeO 6
Author(s) -
Yamaguchi Osamu,
Uegaki Tatsuji,
Shimizu Kiyoshi
Publication year - 1988
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1988.tb06397.x
Subject(s) - tetragonal crystal system , octahedron , decomposition , yttrium , crystallography , tellurium , metastability , materials science , amorphous solid , hexagonal crystal system , phase (matter) , chemistry , crystal structure , metallurgy , organic chemistry , oxide
A metastable modification of Y 2 TeO 6 crystallizes at 770°C to 870°C at a heating rate of 10°C·min −1 in air from an amorphous material prepared by the simultaneous hydrolysis of yttrium and tellurium alkoxides. It has a tetragonal unit cell with a=1.0428 nm and c=1.7524 nm. The tetragonal‐to‐hexagonal phase transformation occurs at 920° to 960°C. Hexagonal Y 2 TeO 6 decomposes into Y 6 TeO 12 and TeO 3 ↑ at 1220° to 1320°C; only Y 6 TeO 12 is obtained as the decomposition product. Both modifications of Y 2 TeO 6 are built up by octahedral TeO 6 groups.