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Paracrystallinity or randomness: a challenge for non crystalline structure

M. POPESCU1,* , M. LEONOVICI2

Affiliation

  1. National Institute R&D for Materials Physics, P. O. Box MG. 7, 077125-Bucharest-Magurele, Romania
  2. University of Bucharest, Department of Solid State Physics, P.O. Box MG. 11, 077125 Bucharest-Magurele, Romania

Abstract

The structure of low coordinated disordered materials can be understood in the frame of basically different theories: the formation of a continuous random network with all the valence bonds satisfied, the formation of small clusters (amorphites) having all the bond at the margins satisfied (closed clusters) or open clusters with many dangling bonds that are partially compensated due to the formation of valence alternation pairs, and last but not least the formation of so-called nano paracrystalline structures, i.e. deformed nano-crystalline structures. We show that an intermediate model based on a mixture of closed and open clusters as well as layer like configurations can explain the structure and properties of the binary arsenic chalcogenide glasses..

Keywords

Amorphous, Paracrystal, Randomness, Arsenic chlacogenide, Structural modelling.

Submitted at: Sept. 1, 2006
Accepted at: Sept. 13, 2006

Citation

M. POPESCU, M. LEONOVICI, Paracrystallinity or randomness: a challenge for non crystalline structure, Journal of Optoelectronics and Advanced Materials Vol. 8, Iss. 5, pp. 1831-1837 (2006)