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Inclined Dislocations in Synthetic Calcite Crystals
Author(s) -
Desai C. C.,
George K. V.
Publication year - 1981
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.2170160616
Subject(s) - cleavage (geology) , calcite , materials science , crystallography , polishing , partial dislocations , crystal (programming language) , nucleation , etching (microfabrication) , dislocation , mineralogy , composite material , chemistry , layer (electronics) , organic chemistry , fracture (geology) , computer science , programming language
A large number of perfect (100) cleavages were obtained by cleaving the laboratory grown synthetic calcite crystals. By etching such cleavages in 20% ammonium chloride solution, it is established that the pits indicate the sites of dislocations in the crystals. This is further confirmed by comparing the etch patterns on matched cleavage surfaces. Eccentricity of the pits has been attributed to the inclined nature of dislocations. Existence of parallel dislocations seems to be due to the purity of the crystal. These observations are verified by comparing etch patterns produced on opposite faces of a thin flake (0.048 mm thick) and also by successive etching and polishing a cleavage surface. It is conjectured that curl‐bottomed pits nucleate at the sites of screw dislocations in the crystal. The implications are discussed.