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Chemical dissolution of calcite cleavages in aqueous solutions of sodium hydroxide
Author(s) -
Shah A. J.,
Pandya J. R.
Publication year - 1985
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170200620
Subject(s) - dissolution , activation energy , sodium hydroxide , aqueous solution , etching (microfabrication) , arrhenius equation , isotropy , calcite , isotropic etching , chemistry , hydroxide , anisotropy , etch pit density , cleavage (geology) , mineralogy , materials science , crystallography , inorganic chemistry , composite material , organic chemistry , optics , physics , layer (electronics) , fracture (geology)
Optical study of isotropic and anisotropic etch rates by controlled chemical dissolution of calcite cleavage surfaces employing aqueous solution of sodium hydroxide at various etching temperatures is presented. The etch rates are found to be independent of etching time. The isotropic etch rates are found to be smaller than anisotropic etch rates, whereas Arrhenius plots yield activation energy for anisotropic dissolution greater than that for isotropic etching. It is also shown from a comparative study of chemical effect of various etchants on calctie cleavages that for a given plane shape of dislocation etch pits the activation energy is constant and independent of etching temperature and etchant concentration and that it is a characteristic of the etchant and not of the crystal.