Structural transformations in metals at high compression ratios

Yu.Kh. Vekilov, O.M. Krasil’nikov
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.

PACS: 61.50.Ks, 61.66.Bi, 62.20.D−, 62.50.−p (all)
DOI: 10.3367/UFNe.0179.200908f.0883
URL: https://ufn.ru/en/articles/2009/8/f/
Web of Science

000273727200006
Scopus

2-s2.0-70450250432
ADS NASA

2009PhyU...52..831V
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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