Abstract
The Ag2Se–GeSe2–SnSe2 system has been studied in the temperature range 290–430 K using differential thermal analysis, X-ray diffraction, and emf measurements concerning silver concentration cells with Ag4RbI5 as a solid electrolyte. We have constructed a number of vertical sections; the 300-, 800-, and 900-K isothermal sections of the phase diagram; and a projections of the liquidus surface. It has been shown that the only pseudobinary join, Ag8GeSe6–Ag8SnSe6, contains a continuous series of solid solutions between the two crystalline phases of the constituent selenides and divides the system into two independent subsystems. Ag2Se–Ag8GeSe6–Ag8SnSe6 is a univariant, eutectic subsystem, and GeSe2–Ag8GeSe6–Ag8SnSe6–SnSe2 is an invariant eutectic subsystem. Experimental emf data were used to evaluate partial thermodynamic functions of the silver in the high-temperature and low-temperature Ag8Ge1–x Sn x Se6 solid solutions.
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Fiziko-khimicheskie svoistva poluprovodnikovykh veshchestv. Spravochnik (Physicochemical Properties of Semiconducting Substances: A Handbook), Novoselova, A.V. and Lazarev, V.B., Eds., Moscow: Nauka, 1976.
Babanly, M.B., Yusibov, Yu.A., and Abishev, V.T., Trekhkomponentnye khal’kogenidy na osnove medi i serebra (Ternary Copper Silver Chalcogenides), Baku: Bakinsk. Gos. Univ., 1993.
He, Q., Huang, Sh., Wang, Ch., et al., The role of Mott–Schottky heterojunctions in Ag–Ag8SnS6 as counter electrodes in dye-sensitized solar cells, Chem-SusChem, 2015, vol. 8, no. 5, pp. 817–820.
Fujikane, M., Kurosaki, K., Muta, H., and Yamanaka, S., Thermoelectric properties of Ag8GeTe6, J. Alloys Compd., 2005, vol. 396, pp. 280–282.
Lu Chun-Lin, Zhang Lin, Zhang Yun-Wang, Liu Shen-Ye, and Mei Yang, Electronic, optical properties, surface energies and work functions of Ag8SnS6: firstprinciples method, Chin. Phys. B, 2015, vol. 24, paper 017 501.
Ivanov-Schitz, A.K. and Murin, I.V., Ionika tverdogo tela (Solid State Ionics), St. Petersburg: S.-Peterburg. Univ., 2000, vol. 1.
Hull, S., Berastegui, P., and Grippa, A., Ag+ diffusion within the rock-salt structured superionic conductor Ag4Sn3S8, J. Phys.: Condens. Matter, 2005, vol. 17, pp. 1067–1084.
Aliyeva, Z.M., Bagheri, S.M., Aliev, Z.S., Alverdiyev, I.J., Yusibov, Yu.A., and Babanly, M.B., The phase equilibria in the Ag2S–Ag8GeS6–Ag8SnS6 system, J. Alloys Compd., 2014, vol. 611, pp. 395–400.
Alieva, Z.M., Bagkheri, S.M., Alverdiev, I.J., Yusibov, Yu.A., and Babanly, M.B., Phase equilibria in the pseudoternary system Ag2Se–Ag8GeSe6–Ag8SnSe6, Inorg. Mater., 2014, vol. 50, no. 10, pp. 1063–1068.
Bagheri, S.M., Imamaliyeva, S.Z., Mashadiyeva, L.F., and Babanly, M.B., Phase equilibria in the Ag8SnS6–Ag8SnSe6 system, Int. J. Adv. Sci. Technol. Res., 2014, issue 4, no. 2, pp. 291–296.
Bagkheri, S.M., Alverdiev, I.J., Yusibov, Yu.A., and Babanly, M.B., Phase equilibria in the Ag8GeS6–Ag8GeSe6 system and some properties of solid solutions, Azerb. Khim. Zh., 2014, no. 3, pp. 15–21.
Gorochov, O., Les composés Ag8MX6 (M = Si, Ge, Sn et X = S, Se, Te), Bull. Soc. Chim. Fr., 1968, pp. 2263–2275.
Ollitrault-Fichet, R., Rivet, J., and Flahaut, J., Diagramme de phase du systeme Ag–Ge–Se, J. Less-Common. Met., 1985, vol. 114, pp. 273–289.
Salaeva, Z.Yu., Allazov, M.R., and Movsum-zade, A.A., Systems Ag2Se–GeSe2 and Ag8GeSe6–Ge, Zh. Neorg. Khim., 1985, vol. 30, no. 7, pp. 1834–1837.
Mikolaichuk, A.G. and Moroz, V.N., Concerning the existence of the Ag2GeSe3 compound, Zh. Neorg. Khim., 1987, vol. 32, no. 9, pp. 2312–2313.
Velásquez-Velásquez, A., Belandria, E., Fernandez, B.J., Avila Godoy, R., Delgado, G., and Acosta-Najarro, G.D., Synthesis and characterization of the ternary compound Ag2GeSe3, Phys. Status Solidi B, 2000, vol. 220, no. 1, pp. 683–686.
Ollitrault Fichet, R., Rivet, J., Flahaut, J., Daher, H., and Khanafer, M., Description du systeme ternaire Ag–Sn–Se, J. Less-Common Met., 1988, vol. 138, pp. 241–261.
Carré, D., Ollitrault Fichet, R., and Flahaut, J., Structure de Ag8GeSe6 β, Acta Crystallogr., Sect. B: Struct. Crystallogr. Cryst. Chem., 1980, vol. 36, pp. 245–249.
Moroz, V.M., Shchurok, A.I., Mykolaichuk, O.G., Byalyk, M.V., et al., System Ag–Sn–Se. Detailed structure of T–x space, Fiz. Khim. Tverd. Tila, 2003, vol. 4, no. 3, pp. 532–535.
Gulay, L.D., Olekseyuk, I.D., and Parasyuk, O.V., Crystal structure of β-Ag8SnSe6, J. Alloys Compd., 2002, vol. 339, pp. 113–117.
Karakhanova, M.I., Sokolova, L.P., and Novoselova, A.V., Phase diagram of the system SnSe2–GeSe2, Izv. Akad. Nauk SSSR, Neorg. Mater., 1976, vol. 12, pp. 1221–1222.
Glazov, V.M., Burkhanov, A.S., and Saleeva, N.M., A procedure for the preparation of single-phase copper and silver chalcogenides, Izv. Akad. Nauk SSSR, Neorg. Mater., 1977, vol. 13, no. 5, pp. 917–919.
Babanly, M.B. and Yusibov, Yu.A., Elektrokhimicheskie metody v termodinamike neorganicheskikh sistem (Electrochemical Methods in the Thermodynamics of Inorganic Systems), Baku: ELM, 2011.
Babanly, M.B., Yusibov, Y.A., and Babanly, N.B., The EMF method with solid-state electrolyte in the thermodynamic investigation of ternary copper and silver chalcogenides, Electromotive Force and Measurement in Several Systems, Kara, S., Ed., Intech, 2011, pp. 57–78.
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Original Russian Text © I.J. Alverdiev, S.M. Bagheri, Z.M. Aliyeva, Yu.A. Yusibov, M.B. Babanly, 2017, published in Neorganicheskie Materialy, 2017, Vol. 53, No. 8, pp. 801–809.
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Alverdiev, I.J., Bagheri, S.M., Aliyeva, Z.M. et al. Phase equilibria in the Ag2Se–GeSe2–SnSe2 system and thermodynamic properties of Ag8Ge1–x Sn x Se6 solid solutions. Inorg Mater 53, 786–796 (2017). https://doi.org/10.1134/S0020168517080027
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DOI: https://doi.org/10.1134/S0020168517080027