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Defects of the hypervalent configuration type and their manifestation in properties of chalcogenide glasses

  • Proceedings of the International Conference “Glasses and Solid Electrolytes” (St. Petersburg, Russia, May 17–19, 1999)
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Abstract

The results obtained in quantum-chemical investigations of defects of the hypervalent configuration (HVC) type in chalcogenide glasses are reviewed for the first time. The similarity and difference between the hypervalent configurations and conventional defects of the valence alternation pair (VAP) type are analyzed. It is demonstrated that the hypervalent configurations are more energetically favorable and, hence, offer advantages in the interpretation of macroscopic (features of structural diffraction, high viscosity of melts, breaking-free mechanism of bond switching upon viscous flow, mechanical strength in the solid state, excess entropy, etc.) and microscopic (electron-optical) glass properties, including the properties traditionally interpreted within double-well potentials and soft atomic configurations. The prospects of the hypervalent configuration model and the ensuing new directions in studies of chalcogenide glasses are considered.

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Authors and Affiliations

  1. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Leninskiipr. 31, 117907, Moscow, Russia

    S. A. Dembovsky & F. V. Grigor’ev

  2. Institute of New Chemical Problems, Russian Academy of Sciences, p/o Chernogolovka, 142432, Noginskii raion, Moscow oblast, Russia

    A. S. Zyubin

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  1. S. A. Dembovsky
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  2. A. S. Zyubin
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  3. F. V. Grigor’ev
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Dembovsky, S.A., Zyubin, A.S. & Grigor’ev, F.V. Defects of the hypervalent configuration type and their manifestation in properties of chalcogenide glasses. Glass Phys Chem 26, 231–241 (2000). https://doi.org/10.1007/BF02738289

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