Methodological notes

Structural transformations in metals at high compression ratios

Moscow State Institute of Steel and Alloys (Technology University), Leninskii prosp. 4, Moscow, 117936, Russian Federation

An analysis of crystal structure stability against homogeneous deformation is carried out for simple and transition metals with body-centered cubic (bcc) and face-centered cubic (fcc) lattices under pressure. It is shown that at high compression ratios a crystal lattice can turn unstable against shear deformations, leading to new lower-symmetry structures. To analyze these structures, the Landau theory of phase transitions with finite deformation tensor components as order parameters is applied. A comparison is made with experimental data on high-pressure phases. Prospects are discussed for using the suggested approach to explain structural transformations in solids at high pressures.

Fulltext is available at IOP
PACS: 61.50.Ks, 61.66.Bi, 62.20.D−, 62.50.−p (all)
DOI: 10.3367/UFNe.0179.200908f.0883
Citation: Vekilov Yu Kh, Krasil’nikov O M "Structural transformations in metals at high compression ratios" Phys. Usp. 52 831–834 (2009)
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Оригинал: Векилов Ю Х, Красильников О М «Структурные превращения в металлах при больших степенях сжатия» УФН 179 883–886 (2009); DOI: 10.3367/UFNr.0179.200908f.0883

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