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The high-temperature behaviour of beryl melts and glasses

Published online by Cambridge University Press:  14 March 2018

R. P. Miller  and
R. A. Mercer
R. P. Miller
Affiliation:
National Chemical Laboratory, Teddington, Middlesex
R. A. Mercer
Affiliation:
National Chemical Laboratory, Teddington, Middlesex
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Summary

The course of all crystalline structural changes undergone by the mineral beryl, its melt and glass, has been followed as a function of widely differing but accurately known thermal history. Non-equilibrium ordering processes have been characterized by new techniques in high-temperature microscopy.

The relative influence that beryllium and aluminium ions exert on the phase changes has been established by studies on synthetic melts and glasses representing hypothetical beryls of differing ratios of Be2+:Al3+ ions.

The dynamic changes between the oxide and orthosilicate structures into which the systems reconstitute include the formation of a metastable hybrid beryllium aluminium silicate, which is viewed as a beryllium-containing mullite. The crystallochemical changes have been interpreted in terms of a structural model of the melts and glasses that is shown to be consistent with the ordering effects predicted from the field strengths of the cations.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 35 , Issue 270 , June 1965 , pp. 250 - 276
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1965

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