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Pyrochlore Phase Formation in the System Bi 2 O 3 –ZnO–Ta 2 O 5
Author(s) -
Khaw C. C.,
Lee C. K.,
Zainal Z.,
Miles G. C.,
West A. R.
Publication year - 2007
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.1551-2916.2007.01608.x
Subject(s) - solid solution , pyrochlore , phase diagram , phase (matter) , materials science , analytical chemistry (journal) , mineralogy , crystallography , chemistry , metallurgy , organic chemistry , chromatography
The subsolidus phase diagram of the system Bi 2 O 3 –ZnO–Ta 2 O 5 in the region of the cubic pyrochlore phase has been determined at 1050°C. This phase forms a solid solution area that includes the ideal composition P, Bi 3 Zn 2 Ta 3 O 14 ; possible solid solution mechanisms are proposed, supported by density measurements of Zn‐deficient solid solutions. The general formula of the solid solutions is Bi 3+ y Zn 2− x Ta 3− y O 14− x − y , based on the creation of Zn 2+ , O 2− vacancies in Zn‐deficient compositions and a variable Bi/Ta ratio.