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High-pressure scandium oxide and its place in the molar volume relationships of dense structures of M 2 X 3 and ABX 3 type

1969; American Geophysical Union; Volume: 74; Issue: 12 Linguagem: Inglês

10.1029/jb074i012p03238

2156-2202

Allen F. Reid, A. E. Ringwood,

Thermal Expansion and Ionic Conductivity

Journal of Geophysical Research (1896-1977)Volume 74, Issue 12 p. 3238-3252 High-pressure scandium oxide and its place in the molar volume relationships of dense structures of M 2 X 3 and ABX 3 type A. F. Reid, A. F. ReidSearch for more papers by this authorA. E. Ringwood, A. E. RingwoodSearch for more papers by this author A. F. Reid, A. F. ReidSearch for more papers by this authorA. E. Ringwood, A. E. RingwoodSearch for more papers by this author First published: 15 June 1969 https://doi.org/10.1029/JB074i012p03238Citations: 71AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onEmailFacebookTwitterLinkedInRedditWechat Abstract Sc2O3 has been transformed at 1000°C and 130 kb from the relatively open C-rare-earth structure type to the monoclinic B-rare-earth form with unit cell dimensions α = 13.173 A, b = 3.194 A, c = 7.976 A, and β = 100.40°. The calculated density, 4.16 g/cm3, represents an increase of 8.3% over the density of C-type Sc2O3 and reflects an increase in coordination from six to seven fold for two-thirds of the scandium atoms. Under the same conditions In2O3 was transformed to a corundum form, but a corundum form of Sc2O3 could not be obtained at any intermediate pressure. Graphs of average metal-oxygen bond length versus molar volume, using these high-pressure phases as key examples and six-coordinate bond lengths as reference points, have enabled us to define the molar volume for a given M2X3 or ABX3 composition in any of the denser structural forms. 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