Abstract—
Solid-state reactions have been used to study phase relations between KLa(SO4)2 and CaSO4 at temperatures in the range 600–800°C. The phase diagram of the KLa(SO4)2–CaSO4 system has been constructed using thermogravimetry and X-ray diffraction results. The system has been shown to contain neither intermediate compounds nor solid solutions. The KLa(SO4)2 double sulfate decomposes at a temperature of 970°C. An endothermic peak at a temperature of 900°C is observed over the entire composition range and corresponds to a eutectic line. Differential thermal analysis curves of the constituent sulfates KLa(SO4)2 and CaSO4 do not show this peak. The largest magnitude of the 900°C endotherm corresponds to a eutectic containing 70 mol % CaSO4.
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REFERENCES
Bushuev, N.N., Nikonova, N.S., and Mishenina, N.V., The system CaSO4–SrSO4, Russ. J. Inorg. Chem., 1988, vol. 33, no. 2, pp. 299–301.
Ying-Cen Chen, Pei-Yi Hsu, Tuan, W., and Po-Liang Lai, From phase diagram to the design of strontium-containing carrier, J. Asian Ceram. Soc., 2020. https://doi.org/10.1080/21870764.2020.1774972
Bushuev, N.N., Tavrovskaya, A.Ya., Babaev, S.I., and Egorova, A.N., Investigation of the NaLa(SO4)2–CaSO4 system, Russ. J. Inorg. Chem., 1989, vol. 34, no. 1, pp. 100–103.
Bushuev, N.N., Efremov, O.N., and Tavrovskaya, A.Ya., NaCe(SO4)2–CaSO4 system, Russ. J. Inorg. Chem., 1988, vol. 33, no. 3, pp. 418–420.
Bushuev, N.N., Tavrovskaya, A.Ya., and Zaitsev, P.M., NaNd(SO4)2–CaSO4 System, Russ. J. Inorg. Chem., 1988, vol. 33, no. 9, pp. 1384–1385.
Bushuev, N.N., Galaktionov, S.S., and Maier, A.A., NaLn(SO)2–CaSO4 (Ln = La, Ce, Nd) systems, Izv. Akad. Nauk SSSR, Neorg. Mater., 1990, vol. 26, no. 1, pp. 167–171.
Bushuev, N.N., Nabiev, A.G., and Klassen, P.V., Vliyanie primesei na kristallizatsiyu sul’fata kal’tsiya v proizvodstve ekstraktsionnoi fosfornoi kisloty (Effect of Impurities on Calcium Sulfate Crystallization in the Production of Wet-Process Phosphoric Acid), Seriya Mineral’nye udobreniya i sernaya kislota (Mineral Fertilizers and Sulfuric Acid Series), Moscow: NIITEKhIM, 1990.
Bushuev, N.N., Fiziko-khimicheskoe issledovanie strukturnykh osobennostei sul’fata kal’tsiya (Detailed Physicochemical Study of the Structure of Calcium Sulfate), Seriya Mineral’nye udobreniya i sernaya kislota (Mineral Fertilizers and Sulfuric Acid Series), Moscow: NIITEKhIM, 1990.
Zhang, H., Zhao, H., Chen, J., Li, J., Yu, J., and Nie, J., Defect study of MgO–CaO material doped with CeO2, Adv. Mater. Sci. Eng., 2013, vol. 2013, p. 5, paper 673786.
Ghoneim, N.M., Mandour, M.A., and Serry, M.A., Sintering of lime doped with La2O3 and CeO2, Ceram. Int., 1989, vol. 15, no. 6, pp. 357–362.
Bushuev, N.N. and Zinin, D.S., Thermal decomposition features of calcium and rare-earth oxalates, Russ. J. Inorg. Chem., 2016, vol. 61, no. 2, pp. 161–167.
Bushuev, N.N., Nabiev, A.G., Petropavlovskii, I.A., and Smirnova, I.S., Character of inclusion of REE of the cerium subgroup in the structure of calcium sulfate crystallohydrates, Russ. J. Appl. Chem., 1988, vol. 61, no. 10, pp. 1973–1977.
Bushuev, N.N., Maslennikov, B.M., and Borisov, V.M., Phase transitions during dehydration of CaSO4 · 2H2O, Russ. J. Inorg. Chem., 1983, vol. 28, no. 10, pp. 1404–1407.
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Bushuev, N.N., Egorova, A.N. & Tyul’bendzhyan, G.S. KLa(SO4)2–CaSO4 System. Inorg Mater 57, 142–145 (2021). https://doi.org/10.1134/S0020168521020047
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DOI: https://doi.org/10.1134/S0020168521020047