A NEW HIGH-PRESSURE PHASE OF BISMUTH OXIDE

Authors
ATOU T FAQIR H KIKUCHI M CHIBA H SYONO Y
Citation
T. Atou et al., A NEW HIGH-PRESSURE PHASE OF BISMUTH OXIDE, Materials research bulletin, 33(2), 1998, pp. 289-292
Citations number
9
Categorie Soggetti
Material Science
Journal title
Materials research bulletin → ACNP
ISSN journal
00255408
Volume
33
Issue
2
Year of publication
1998
Pages
289 - 292
Database
ISI
SICI code
0025-5408(1998)33:2<289:ANHPOB>2.0.ZU;2-G
Abstract
A new polymorphic form of bismuth oxide (Bi2O3) is synthesized by a hi gh-pressure technique (6 GPa and 880 degrees C, and subsequently slow cooling). This phase can exist under ambient conditions, but it is fai rly unstable. The crystal structure is determined to be the A-type rar e-earth sesquioxide structure that is isotypic to La2O3. Hexagonal cel l parameters are measured to be a = 3.878(1) Angstrom and c = 6.303(1) Angstrom. The pressure effect on a polarizable 6s2 lone pair characte r of Bi3+ is discussed. (C) 1998 Elsevier Science Ltd.