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Proximity between reacting partners for diffusion‐controlled growth of barium tungstate crystals from sodium tungstate melts
Author(s) -
Roy B. N.,
Goh Kim Hong
Publication year - 1980
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.19800151009
Subject(s) - tungstate , crystallization , sodium tungstate , diffusion , enthalpy , barium , thermodynamics , materials science , activation energy , crystal growth , crystal (programming language) , crystallography , chemistry , tungsten , physics , metallurgy , computer science , programming language
The separation distance ( d 12 ) between a diffusing particle and its host necessary for a successful diffusion was estimated for diffusion‐controlled crystal growth of BaWO 4 from Na 2 WO 4 melts. Such distances slightly increased with increased cooling rates ( R T ) and crystallization temperatures ( T 0 ). The energy ( E ), enthalpy (Δ H a ), entropy (Δ S a ) and free‐energy (Δ G a ) of activation, and the probability factor ( P ) were also estimated. These parameters did not change with the changes in R T and T 0 .