Sulphurization of coprecipitated carbonates for formation of CaLa2S4
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Factors including BET surface area and La/Ca mole ratio of the coprecipitated carbonates, pH value of the solvent and decomposition atmosphere before sulphurization for fabrication of ultrafine CaLa2S4 powder were investigated. The CaLa2S4 powder was formed through decomposition of coprecipitated carbonates in vacuum and sulphurization with hydrogen sulphide at low temperature. The resultant powder was determined to be a pure CaLa2S4 without oxysulphide phase, as analysed by X-ray diffraction. It consisted of fine particles of size ∼1.6 μm and showed translucency after sintering at 1400 °C under an H2S atmosphere.
KeywordsHydrogen Polymer Atmosphere Sulphide Fine Particle
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- 1.K. J. Sauders, T. Y. Wong and R. L. Gentilman, Adv. Optical Mater. Proc. SPIE 505 (1984) 3.Google Scholar
- 8.G. Spinolo and U. A. Tamurini, “Microstructure-Kinetics Relationship in Thermal Decomposition of Alkali-Earth Carbonates”, in “High Tech Ceramics”, edited by P. Vincenzini (Elsevier Science, Amsterdam, 1987) pp. 367–74.Google Scholar
- 9.T. Toide, Bull. Tokyo Inst. Technol. 126 (1975) 35.Google Scholar
- 11.L. F. Hamilton and S. G. Simpson, “Quantitative Chemical Analysis” 12th Edn (Macmillan, New York, 1964) p. 321.Google Scholar
- 14.Powder Diffraction File, Joint Committee on Powder Diffraction Standards, International Center for Diffraction Data, Swarthmore, PA (1975) Card 22-645.Google Scholar
- 15.Idem., (1957) Card 8-464.Google Scholar
- 16.Idem., (1975) Card 27-263.Google Scholar
- 17.Idem., (1976) Card 29-338.Google Scholar
- 18.E. D. Weil, “Sulphur Compounds”, in “Encyclopedia of Chemical Technology”, Vol. 22, 3rd Edn (Wiley, New York, 1978) p. 115.Google Scholar
- 19.B. C. Gates, J. R. Katzer and G. C. A. Schuit, “Chemistry of Catalytic Processes” (McGraw-Hill, New York, 1979).Google Scholar