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

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Science  08 Aug 1969:
Vol. 165, Issue 3893, pp. 586-588
DOI: 10.1126/science.165.3893.586


A new high-pressure polymorph with a modified spinel structure, β-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.

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