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Kinetics of crystal growth of strontium tungstate from solutions in sodium tungstate melts by continuous cooling
Author(s) -
Roy B. N.,
Appalasami S.
Publication year - 1979
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.19790140104
Subject(s) - tungstate , sodium tungstate , crystallization , diffusion , strontium , crystal (programming language) , crystal growth , sodium , materials science , kinetics , inorganic chemistry , chemistry , thermodynamics , tungsten , crystallography , metallurgy , physics , organic chemistry , computer science , programming language , quantum mechanics
The crystallisation kinetics of strontium tungstate from unstirred saturated solutions in sodium tungstate melts was studied by continuous cooling from initial crystallisation temperatures T 0 = 1000° to 800°C to room temperature at cooling rates R T = 0.67° to 3.3°C min −1 . The main crystal growth was diffusion rate‐controlled; the final crystal growth was rate‐controlled by the development rate of excess solute concentration. The estimated diffusion rate constant ( k D ) values increased with cooling rates and initial crystallisation temperatures. They are higher than the rate constants for diffusion‐controlled growth of calcium tungstate from sodium tungstate melts, but very much smaller than those for strontium tungstate from lithium chloride melts.