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REVIEWS OF TOPICAL PROBLEMS

Disorder and order in long-wave high-temperature acoustics (II): monatomic liquids

M. B. Gitis

Chishinau Technical Institute named after S. Lazo

Abstract: Manifestations of order in topologically disordered media are analyzed. Amorphous materials and monatomic melts are considered as examples of disordered media. It is shown that in the case of close-packed liquids geometric and chemical short-range order are most clearly manifested in the acoustic properties. In these materials ordering is of a dynamical character. The temperature dependence of the acoustic properties correlates well with the results of x-ray and neutron diffraction methods of investigation and substantially supplements the latter. The contributions from loss of long-range order and intensification of thermal translational motion on melting are distinguished from one another by comparing the bulk moduli of elasticity of melts, crystals, and amorphous substances.

PACS: 62.60.+v, 62.10.+s, 62.65.+k, 62.20.Dc, 64.70.Dv

Received: April 27, 1992

DOI: 10.3367/UFNr.0162.199211c.0111

 English version: Physics–Uspekhi, 1992, 35:11, 956–990