Premium
The Crystallisation of Calcium Molybdate and Tungstate from Lithium Chloride Melts by Continuous Cooling. The Kinetics of Crystal Growth in Alumina Crucibles
Author(s) -
Packter A.,
Roy B. N.
Publication year - 1974
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.19740091205
Subject(s) - supersaturation , crystallization , tungstate , molybdate , crystal (programming language) , crystal growth , kinetics , materials science , lithium (medication) , lithium chloride , chloride , chemical engineering , mineralogy , inorganic chemistry , chemistry , metallurgy , crystallography , medicine , physics , organic chemistry , quantum mechanics , computer science , engineering , programming language , endocrinology
The kinetics of crystallisation of calcium molybdate and tungstate from unstirred supersaturated solutions in lithium chloride melts — in alumina crucibles — was studied by continuous cooling from initial temperature T 0 = 800°C down to room temperature at cooling rates R T = 20° to 200°C hr −1 . The solutions were analysed chemically and the crystals were examined by optical microscopy. Crystal growth started practically immediately after the onset of cooling: at first, the amount of material deposited onto crystals was far less than the amount of excess solute developed within the supersaturated solutions but crystallisation rates then increased as the crystal sizes increased. Then, after some time t * (at about seventy percent crystallisation), all excess solute was deposited onto growing crystals.