Structure and physicochemical properties of glasses in the (As2Se3)1 − z -(SnSe2) z − x -(Tl2Se) x and (As2Se3)1 − z -(SnSe) z − x -(Tl2Se) x systems
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A comparative investigation of glasses in the As2Se3)1 − z -(SnSe2) z − x -(Tl2Se) x and (As2Se3)1 − z -(SnSe) z − x -(Tl2Se) x systems has been performed. In both systems, the glass formation regions are shifted toward the As2Se3 compound. Only tin(IV) in the structure of glasses in the (As2Se3)1 − z -(SnSe) z − x -(Tl2Se) x system is identified by Mössbauer spectroscopy, whereas glasses in the (As2Se3)1 − z -(SnSe) z − x -(Tl2Se) x system contain both Sn(II) and Sn(IV). The presence of tin in the oxidation state 2+ in the structural network of the glasses does not lead to impurity conduction. The dependences of the density, the microhardness, and the glass transition temperature on the glass composition are explained in the framework of the model according to which the structure of these glasses is built up of structural units corresponding to the As2Se3, AsSe, TlAsSe2, Tl2Se, SnSe, and SnSe2 compounds. It is established that, for crystalline alloys in the (As2Se3)1 − z -(SnSe) z − x -(Tl2Se) x system, there exist two compounds (Tl2SnSe3 and Tl4SnSe4), which are formed by the peritectic reactions; however, structural units of these compounds are not formed in the structural network of glasses.
KeywordsGlass Transition Temperature Isomer Shift Glass Composition Glass Physic Chalcogenide Glass
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- 1.Castro Arata, R.A., Primesnye U − tsentry kak instrument issledovaniya khal’kogenidnykh stekloobraznykh poluprovodnikov (U− Impurity Centers as a Tool for Investigating Chalcogenide Vitreous Semiconductors), St. Petersburg: Herzen Russian State Pedagogical University, 2006 [in Russian].Google Scholar
- 2.Bordovskii, G.A., Castro, R.A., Seregin, P.P., and Dobrodub, A.A., Properties and Structure of (As2Se3)1 − z(SnSe)z − x(GeSe)x and (As2Se3)1 − z(SnSe2)z − x(GeSe2)x Glasses, Fiz. Khim. Stekla, 2006, vol. 32, no. 3, pp. 438–445 [Glass Phys. Chem. (Engl. transl.), 2006, vol. 32, no. 3, pp. 320–324].Google Scholar
- 3.Borisova, Z.U., Khal’kogenidnye poluprovodnikovye stekla (Chalcogenide Semiconductor Glasses), Leningrad: Leningrad State University, 1983 [in Russian].Google Scholar