Сибирский федеральный университет

Тип публикации: статья из журнала

Год издания: 2022

Идентификатор DOI: 10.1016/j.jssc.2022.123573

Аннотация: The purpose of the paper is to establish the position of the tie-lines in the Sb-Sm-Se system at 450 ​°C and 620 ​°C, to determine the optical band gap of the phases. The Sb component is in equilibrium with the γ-Sm2Se3-X-Sm3Se4 (ST Th3P4) solid solution region with α-Sm2Se3. A continuous solid solution forms between the SmSb and SmSe (ST NaCl) phases, with which the Sm3Se4 and Sm4Sb3 phases are in equilibrium. The SmSb-Sm3Se4, Sm3Se4-SmSb2, SmSe-Sm3Sb2 phases are also in equilibrium. In the Sb–Sm2Se3–Se system at 450°С, the tie-line passes between the Sb2Se3–Sm2Se3, Sb2Se3-SmSe1.9 phases. In the Sb–Se system based on Sb2Se3, a solid solution of the subtraction type Sb2-X□XSe3 (X ​= ​0–0.04) is formed. In the Sb-Sm-Se system, there is a solid solution of the substitution type along the cuts from Sb2Se3 to the Sm2Se3 (7 ​mol. % Sm2Se3), SmSe1.9 (4 ​mol. % SmSe1.9) phases. The extreme compositions of solid solutions have a peritectic point. Due to the change in the position of the tie-lines in the Sb–Sm2Se3–Se system at 620 ​°C, additional phases appear in the equilibrium samples from the Sb2Se3–Sm2Se3 section (annealing at 450 ​°C) when heated above 620 ​°C: Sb, SmSe1.9. The optical band gap of the phases is: Sb2-xSmxSe3 solid solution 1.17–1.19 ​eV, α-Sm2Se3 1.62 ​eV. Optical properties of incommensurate SmSe1.9 crystal that were investigated for the first time for this class of crystals indicate complex electronic structure that can be characterized as a multi band gap one, with at least two values of the band gap, 1.08 and 1.68 ​eV. Using optical spectroscopy, Sm ions in SmSe1.9 are proved to be predominantly in 3+ oxidation state. Previously, the formation of ternary compounds in the system was reported in the literature. Carefully conducted research allows us to assert their absence. © 2022 Elsevier Inc.

Журнал: Journal of Solid State Chemistry

Выпуск журнала: Vol. 316

Номера страниц: 123573

ISSN журнала: 00224596

Издатель: Academic Press Inc.

• Shtykova M.A. (Tyumen State University, Volodarsky Str. 6, Tyumen, 625003, Russian Federation)
• Vorob'eva V.P. (Institute of Physical Materials Science SB RAS, Sakhyanova Str. 6, Ulan-Ude, 670047, Russian Federation)
• Fedorov P.P. (Prokhorov General Physics Institute of the Russian Academy of Sciences, Vavilov Str. 38, Moscow, 119991, Russian Federation)
• Molokeev M.S. (Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Akademgorodok Str. 50, Building 38660036, Russian Federation, Siberian Federal University, Krasnoyarsk, Svobodnyj Av. 79660079, Russian Federation)
• Aleksandrovsky A.S. (Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Akademgorodok Str. 50, Building 38660036, Russian Federation, Siberian Federal University, Krasnoyarsk, Svobodnyj Av. 79660079, Russian Federation)
• Elyshev A.V. (Tyumen State University, Volodarsky Str. 6, Tyumen, 625003, Russian Federation)
• Palamarchuk I.V. (Tyumen State University, Volodarsky Str. 6, Tyumen, 625003, Russian Federation)
• Yurev I.O. (Tyumen State University, Volodarsky Str. 6, Tyumen, 625003, Russian Federation, Department of Physical and Applied Chemistry, Kurgan State University, Sovetskaya Str. 63/4, Kurgan640020, Russian Federation)
• Ivanov A.V. (Urals Scientific-Research Institute of Chemicals with Experimental Plant, Montazhnikov Str. 9, Yekaterinburg, 620050, Russian Federation)
• Habibullayev N.N. (Tyumen State University, Volodarsky Str. 6, Tyumen, 625003, Russian Federation)
• Abulkhaev M.U. (Tyumen State University, Volodarsky Str. 6, Tyumen, 625003, Russian Federation)
• Andreev O.V. (Tyumen State University, Volodarsky Str. 6, Tyumen, 625003, Russian Federation, Institute of Solid State Chemistry, Ural Branch, Russian Academy of Sciences, Pervomaiskaya Str. 91, Yekaterinburg, 620990, Russian Federation)

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