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The Coprecipitation of Magnesium Titanyl Hydroxide Powders from Aqueous Solution: Precipitate Compositions and Coprecipitation and Ageing Mechanisms
Author(s) -
Packter A.,
Derry A.
Publication year - 1986
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.2170211106
Subject(s) - coprecipitation , magnesium , hydroxide , chemistry , inorganic chemistry , potentiometric titration , microcrystalline , nuclear chemistry , organic chemistry , ion , crystallography
Abstract Series of magnesium titanyl hydroxides were coprecipitated at ambient temperature, from different mixed metal cation solutions at C M tot = 0.1 M and Mg/TiO ratios from 2 to 1/2), with sodium hydroxide solution. The relevant single precipitations and the coprecipitations were monitored by potentiometric p H titration and the final coprecipitate compositions were examined by chemical analysis, infra‐red spectrophotometry and thermal analysis. The main coprecipitates were «intramicellar mixtures» of microcrystalline titanyl hydroxide with excess magnesium hydroxide or of magnesium hydroxide with excess titanyl hydroxide. The coprecipitates aged in alkaline magnesium hydroxide suspension were mixtures of titanyl hydroxide, magnesium hydroxide and from fifty to ninety percent (relative to the original/magnesium content) of magnesium hydroxotitanate hydrates Mg[TiO(OH) 4 ] · h H 2 O, Mg[TiO 2 (OH) 2 ] · h H 2 O and Mg[Ti 2 O 2 (OH) 6 ] · h H 2 O.