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Kinetics of growth of calcite crystals in presence of ammonium ions
Author(s) -
Söhnel O.,
Handlířová M.,
Macenauer J.
Publication year - 1990
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.2170251202
Subject(s) - calcite , supersaturation , aqueous solution , crystal growth , chemistry , kinetics , ion , crystal (programming language) , growth rate , reaction rate constant , kinetic energy , inorganic chemistry , ammonium , crystallography , analytical chemistry (journal) , mineralogy , chromatography , organic chemistry , geometry , mathematics , physics , quantum mechanics , computer science , programming language
The growth of calcite crystals from an aqueous supersaturated solution of initial concentration 0.15 mol m −3 containing 10 mol m −3 of (NH 4 ) 2 CO 3 has been studied at 298 K. The progress of growth has been followed through determining the composition of the solution by chemical analysis. The crystal growth is controlled by the surface reaction mechanism and satisfies a kinetic equation of the second order with the rate constant 3.7 × 10 −6 m 4 mol −1 s −1 that is independent on the surface area of the present solid. NH 4 + ions do not change the crystal growth mechanism but decrease the growth rate of calcite crystals.