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The X-ray pattern of low-temperature cristobalite

Published online by Cambridge University Press:  14 March 2018

A. H. Jay
A. H. Jay*
Affiliation:
Central Research Department, The United Steel Companies Limited, Stocksbridge, near Sheffield
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Extract

Cristobalite is found as the first product in the conversion of quartz following a high-temperature heating, and it constitutes a large percentage of the crystalline material in most manufactured silica bricks. It is present also in fireclay products, the amount being dependent upon the nature of the raw material and the conditions of firing. In the majority of these products the cristobalite is only poorly developed, i.e. the crystals are only perfect over distances of the order of about 1 × 10-6 cm. This value is derived from the diffuseness of the high-order reflections on the X-ray powder photograph. On the other hand, the crystals of cristobalite are well developed in the hot face of an open hearth silica roof-brick.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 27 , Issue 187 , December 1944 , pp. 54 - 55
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1944

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References

page 54 note 1 Nieuwenkamp, W., Zeits. Krist., 1935, vol. 92, p. 82. [M.A. 6–329.]Google Scholar

page 54 note 1 Nieuwenkamp's values, a 7·02, c 6·92 kX (7·02 = √2 × 4·965).