Abstract
Coprecipitation of barium and lead sulphate was studied from a stand point of crystallography. To each mixed solution of barium and lead nitrates, whose compositions were 10:0, 7.5:2.5, 5:5, 2.5:7.5 and 0:10 by the mole ratio, ammonium sulphate solution was added. The precipitates were analyzed chemically, by the electron microscopy and by the X-ray diffraction method. Barium and lead sulphates precipitated homogeneously by the conventional precipitation method and heterogeneously by the precipitation from homogeneous solution. The morphological characteristics of precipitated particles changed according to the composition of precipitate. The lattice constants of precipitated crystals also changed gradually by the alteration of the composition of precipitate. It seems that the precipitate was composed of a solid solution of barium and lead sulphates.
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