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The mechanism of growth of quartz crystals into fused silicaIt is proposed that the growth of quartz crystals into fused silica is effected by a mechanism involving the breaking of an Si-O bond and its association with an OH group, followed by cooperative motion of the nonbridging oxygen and the hydroxyl group which results in the crystallization of a row of several molecules along a crystalline-amorphous interfacial ledge. This mechanism explains, at least qualitatively, all the results of the earlier experimental study of the dependence of quartz crystal growth upon applied pressure: large negative activation volume; single activation enthalpy below Si-O bond energy; growth velocity constant in time, proportional to the hydroxyl and chlorine content, decreasing with increasing degree of reduction, and enhanced by nonhydrostatic stresses; lower pre-exponential for the synthetic than for the natural silica.
Document ID
19810037734
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Fratello, V. J.
(Harvard Univ. Cambridge, MA, United States)
Hays, J. F.
(Harvard Univ. Cambridge, MA, United States)
Spaepen, F.
(Harvard Univ. Cambridge, MA, United States)
Turnbull, D.
(Harvard University Cambridge, Mass., United States)
Date Acquired
August 11, 2013
Publication Date
December 1, 1980
Publication Information
Publication: Journal of Applied Physics
Volume: 51
Subject Category
Solid-State Physics
Accession Number
81A22138
Funding Number(s)
CONTRACT_GRANT: NSF EAR-79-06321
CONTRACT_GRANT: NGL-22-007-247
CONTRACT_GRANT: NSF DMR-77-01111
Distribution Limits
Public
Copyright
Other

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