The shape of order in glasses

Authors

  • E. A. Chechetkina

    Corresponding author
    1. Institute of General and Inorganic Chemistry, Leninsky Pr. 31, 119991 Moscow, Russia
    • Institute of General and Inorganic Chemistry, Leninsky Pr. 31, 119991 Moscow, Russia
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  • Dedicated to Stanford R. Ovshinsky on the occasion of his 90th birthday

Abstract

The chemical bond approach to the glassy state is discussed. It is based on two concepts: Ovshinsky's idea of bond option as a necessary condition for amorphization, and Dembovsky's notions about hypervalent bonds (HVB) as alternative bonding state responsible for glass specificity and glass formation at all. The third idea is self-organization of HVBs in the form of a bond wave, which provides an interconnected interpretation of three structural levels: short-range order that is different at around HVB and far outside it, medium-range order in the wavefronts populated with HVB, and long-range order due to the bond wave itself. Experimental evidences and practical consequences of the bond-wave picture are discussed.

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