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Some High-pressure Transformations in Pyroxenes

Nature volume 196, pages 883–884 (1962)Cite this article

Abstract

WE have recently investigated the effects of high pressures on the following germanates, which were found to possess pyroxene structures, namely, FeGeO3, CoGeO3, (Mg0.75Ni0.25)GeO3, MgGeO3 and MnGeO3. These compounds were synthesized by heating tablets formed from intimately mixed oxide components at various suitable temperatures between 900° C and 1,400° C for times sufficient to reach equilibrium. In the case of FeGeO3, the tablet was formed from the required proportions of iron powder, Fe2O3 and GeO2. This was wrapped in platinum foil, sealed in an evacuated silica tube, and then heated at 900° C for 24 h. X-ray diffraction photographs of the resultant products revealed that FeGeO3, CoGeO3 and (Mg0.75Ni0.25)GeO3 possessed clinopyroxene structures whereas MgGeO3 and MnGeO3 displayed orthopyroxene structures. We were unable to synthesize a compound with the composition NiGeO3.

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Authors and Affiliations

  1. Department of Geophysics, Australian National University, Canberra

    A. E. RINGWOOD & MERREN SEABROOK

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  1. A. E. RINGWOOD
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  2. MERREN SEABROOK
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RINGWOOD, A., SEABROOK, M. Some High-pressure Transformations in Pyroxenes. Nature 196, 883–884 (1962). https://doi.org/10.1038/196883a0

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