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Two synthetic compounds containing chromium in different valency states

Published online by Cambridge University Press:  14 March 2018

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

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
Copyright
Copyright © 1960, The Mineralogical Society

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