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On the Dissolution of Grown Synthetic Quartz Inside the Autoclaves
Author(s) -
Kotru P. N.
Publication year - 1978
Publication title -
kristall und technik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0023-4753
DOI - 10.1002/crat.19780130105
Subject(s) - hillock , quartz , etching (microfabrication) , trigonal crystal system , materials science , dissolution , prism , crystallography , isotropic etching , mineralogy , composite material , geology , chemistry , optics , crystal structure , physics , layer (electronics)
Some results of microtopographical investigations on various habit faces of hydrothermally grown cultured quartz crystals are reported. Circular hillocks with a background of minor rhombohedral surface as dull as the surface surrounding the hillocks are illustrated. The dullness of the surfaces is attributed to microetching of bulk quartz crystals. Unusual etch patterns on major rhombohedral faces are illustrated. Oriented raised humps on rhombohedral faces are explained to be as a result of interaction of etch fronts from different etch nuclei surrounding the humps. Rare observations of oriented depressions on trigonal trapezohedron and prism faces are reported. Possibilities that may lead to etching of bulk quartz crystals both inside as well as outside the growing chambers are discussed. From the considerations of various facets of the processes involved, it emerges that the etch patterns are indicative of quartz crystals getting etched in the growing chambers itself when the supply quartz is exhausted and where the growing chambers is the hottest.