Studies on mercury cadmium sulfide pigments. IV:Addition of zinc
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The authors reported the studies previously on the preparation of the HgS-CdS pigments and the relations between the blending composition and coloring of the HgS-CdS systems, and between the crystal structure and the blending composition or thermal treatment temperature.<BR>This report deals colors and crystal structures of the pigments in HgS-CdS-ZnS systems.<BR>Hg, Cd and Zn were coprecipitated as sulfides by Na<SUB>2</SUB>S solution from their chloride solutions. The coprecipitates were filtrated, dried, ground and then calcined for 3 hrs. at 350°C.<BR>X-ray diffraction studies were carried out using a Toshiba diffractometer, and measurements of diffuse reflectance spectra were made with a Hitachi spectro photometer (Beckmann type).<BR>The values of the energy gap were calculated from the wave lengths corresponding to the intersection of the straight-line extrapolation above and below the short wave length knee of the reflectance curve, i.e., the same procedure was used as that employed by Larach, Shrader and Stocker. (Phys. Rev. 108,587 (1957)) <BR>Results : <BR>1. ZnS has not the same property of extender as BaSO 4. It makes the solid solution with HgS, CdS. and HgS-CdS.<BR>2. The colors obtained in this study with the HgS-CdS-ZnS systems ranged from light yellow (lemon) to dark maroon, depending on the content of each component of the samples.<BR>3. As the amounts of CdS or ZnS increase, the colors of the pigments shift toward the hypochromic hues, and this effect of ZnS in greater than CdS. In case of HgS, it shifts toward the bathochromic hues.<BR>4. The crystal structures of the solid solutions tend to be hexagonal with increasing CdS contents. and to be cubic with increasing HgS or ZnS contents.<BR>The interplaner spacing becomes smaller with increasing ZnS contents.<BR>5. The values of the energy-gap calculated from the reflectance curves increase with increasing ZnS or CdS contents, but decrease with increasing HgS contents.
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