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The crystallisation of alkaline‐earth metal silicates and titanates from metal chloride melts solubility‐temperatur phase diagram studies
Author(s) -
Packter A.
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.19800150204
Subject(s) - solubility , silicate , phase diagram , metal , inorganic chemistry , barium , titanate , calcium silicate , phase (matter) , calcium titanate , strontium , chemistry , materials science , mineralogy , ceramic , organic chemistry , composite material
The solubility‐temperature phase diagrams have been analysed for calcium and barium silicate solutions and for calcium, strontium and barium titanate solutions in the metal chloride melts. These systems are typical binary metal salt mixtures with no solid solution or compound formation. Activity coefficients were estimated from log solubility v reciprocal temperature plots and the anion polymerisation numbers were estimated from these coefficients. The metal silicate systems are non‐ideal at silicate mole fractions from 0.1 to 0.8: the solubilities at any temperature are appreciably greater than the ideal values determined from the temperatures and enthalpies of metal silicate fusion: the calcium silicate systems contain upto 50 percent trisilicate chains, while the barium silicate systems contain up to 100 percent trisilicate chains and significant amounts of tetrasilicate chains. The metal titanate systems are practically ideal at titanate mole fractions from 0.01 to 0.3 and possibly upt < 0.6; the solubilities at any temperature are then determined by the temperatures and enthalpies of metal titanate fusion, only.