Thermal Change of the Coprecipitates of Cadmium Sulfide and Mercury (II) Sulfide Prepared from the Different Salts:Studies on Mercury Cadmium Sulfide Pigments VI

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The effects of starting salts on the color, particle size and crystal structure of mercury-cadmium-sulfide pigment were investigated. The coprecipitates of cadmium sulfide and mercury (II) sulfide were prepared by adding sodium sulfide solution to mixed solutions of cadmium salts and mercury (II) salts. Starting salts used in this experiment are chloride, nitrate, sulfate and acetate of cadmium and mercury (II). The coprecipitates were calcined at 300-500°C, or hydrothermaly treated at 350°C for 2 hours.<BR>The powder properties of the coprecipitates and their heat treated products were investigated by spectral reflectance, electron microscopy, X-ray diffraction and thermal analysis.<BR>The sample-C prepared from the chloride and sample-A prepared from the acetate developed red color by calcination, but the sample-N prepared from the nitrate and the sample-S prepared from the sulfate did not develop red color. The red color pigments were obtained by treating the coprecipitates hydrothermally. It was found that the red pigments were the [(Cd, Hg) S] solid solutions with a crystalline hexagonal CdS structure.
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