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Science 8 August 1969:
Vol. 165. no. 3893, pp. 586 - 588
DOI: 10.1126/science.165.3893.586
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Articles

Modified Spinel, Beta-Manganous Orthogermanate: Stability and Crystal Structure

Nobuo Morimoto 1, Syun-Iti Akimoto 2, Kichiro Koto 3, and Masayasu Tokonami 3

1 Institute of Scientific and Industrial Research, Osaka University, Yamadakami, Suita, Osaka, Japan
2 Institute for Solid State Physics, University of Tokyo, Roppongi, Minato, Tokyo, Japan
3 Institute of Scientific and Industrial Research, Osaka University

A new high-pressure polymorph with a modified spinel structure, beta-Mn2GeO4, is stable in a pressure range intermediate between the field of the polymorph with the olivine structure and that of another high-pressure polymorph. Oxygen atoms are located approximately in cubic close packing with manganese and germanium atoms in octahedral and tetrahedral interstices, respectively, as in the spinel structure; however, germanium atoms form Ge2O7 groups instead of isolated GeO4 groups.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Comparative high-pressure crystal chemistry of wadsleyite, {beta}-(Mg1-xFex)2SiO4, with x = 0 and 0.25.
R. M. Hazen, M. B. Weinberger, H. Yang, and C. T. Prewitt (2000)
American Mineralogist 85, 770-777
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Science. ISSN 0036-8075 (print), 1095-9203 (online)