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Two synthetic compounds containing chromium in different valency states

Published online by Cambridge University Press:  14 March 2018

W. Johnson
W. Johnson*
Affiliation:
The United Steel Companies Limited, Research and Development Dept., Swinden Laboratories, Moorgate, Rotherham, Yorkshire
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Summary

Two compounds, one an apatite and the other a perovskite, have been synthesized by sintering mixtures containing CaO and Cr2O3, and CaO, Cr2O3, and Fe2O3 respectively. The apatite formed by partial oxidation of the Cr2O3 and subsequent pick-up of moisture from the atmosphere, to give Ca5(CrO4)3OH. The perov-skite formed as a non-stoicheiometric compound Ca4(Fe,Cr)4O11 by partial oxidation of the Cr2O3 during firing. Lattice parameters and interplanar spacings are given for the two structures.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 32 , Issue 248 , March 1960 , pp. 408 - 411
Copyright
Copyright © 1960, The Mineralogical Society

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