Conclusions
We investigated compositions, properties and structure of elementary nuclei for Kimpersai chrome spinels, separated by acids from rocks of 6 new sources in Kazakhstan.
The chemical composition of chrome spinels is relatively constant and close to the stoichiometric, with R2O3: RO changing from 0.9 to 1.2.
According to the classification given in [13]they are related to magnesia chromites (Mg, Fe) Cr2O4
The properties of chrome spinels change with their composition almost linearly. The melting temperature of the chrome spinel is 2050–2060°, that is, they are highly refractory materials and valuable raw materials for the production of new types of refractories.
The x ray defraction method established that in the Kimpersai chrome spinels the ordinary crystalline structure is predominant. The bivalent cations of magnesium and iron are located in the tetrahedral form and the trivalent cations of chromium, aluminum and iron in the octahedral. In the elementary nucleus of such chrome-spinels the cations are distributed in the following manner: 5–6 ions Mg2+ and 2–3 ions Fe2+ are located in the tetrahedral, and 12–13 ions Cr3+, 2–3 ions Al3+, and 1 ion Fe3+ in the octahedral. The oxygen parameter for Kimpersai chrome spinels is somewhat greater than the value for the ideal spinel structure, which can be explained by the expansion of the tetrahedral gaps and the compression of the octahedral.
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Translated from Ogeupory, No.8, pp. 29–36, August, 1966.
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Zubakov, S.M., Aspandiyarova, S.G. Composition and properties of chrome spinels separated by acids from kimpersai rocks. Refractories 7, 453–459 (1966). https://doi.org/10.1007/BF01836515
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DOI: https://doi.org/10.1007/BF01836515