Lattice Instability of Cs2HgCl4 Crystals
The lattice dynamics of Cs2HgCl4 crystals and its relation to the pressure induced proper ferroelastic instability is analyzed using a rigid‐ion model in the quasiharmonic approximation. Such a simple model is already sufficient to reproduce the lattice instability leading to appearance of the prope...
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| Published in: | physica status solidi (b) Vol. 211; no. 2; pp. 631 - 640 |
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| Main Authors: | , , , , , , |
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Berlin
WILEY-VCH Verlag
01-02-1999
WILEY‐VCH Verlag |
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| Abstract | The lattice dynamics of Cs2HgCl4 crystals and its relation to the pressure induced proper ferroelastic instability is analyzed using a rigid‐ion model in the quasiharmonic approximation. Such a simple model is already sufficient to reproduce the lattice instability leading to appearance of the proper ferroelastic phase transition. It has been shown that the lattice loses its stability with respect to the transverse acoustical mode TAZ(k ∥ b), whereas the soft optical mode (B3g symmetry at k = 0) remains stable. This fact is in agreement with the phenomenological theory. |
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| AbstractList | The lattice dynamics of Cs2HgCl4 crystals and its relation to the pressure induced proper ferroelastic instability is analyzed using a rigid‐ion model in the quasiharmonic approximation. Such a simple model is already sufficient to reproduce the lattice instability leading to appearance of the proper ferroelastic phase transition. It has been shown that the lattice loses its stability with respect to the transverse acoustical mode TAZ(k ∥ b), whereas the soft optical mode (B3g symmetry at k = 0) remains stable. This fact is in agreement with the phenomenological theory. |
| Author | Kityk, A. V. Trach, I. B. Girnyk, I. S. Zadorozhna, A. V. Shchur, Ya.I. Martynyuk-Lototska, I.Yu Vlokh, O. G. |
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| Copyright | 1999 WILEY‐VCH Verlag Berlin GmbH, Fed. Rep. of Germany |
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| References | A. V. Kityk, V. P. Soprunyuk, O. G. Vlokh, I. D. Olekseyuk, and S. A. Piroga, Fiz. Tverd. Tela 34, 2044 (1992). R. Blinc and B. Zeks, Soft Modes in Ferroelectrics and Antiferroelectrics, Elsevier Publ. Co., New York 1974 (p. 282). Ya. I. Shchur, A. V. Kityk, I. B. Trach, and O. G. Vlokh, Ukr. Fiz. Zh. 43, 960 (1998). A. V. Kityk, O. M. Mokry, V. P. Soprunyuk, and O. G. Vlokh, J. Phys.: Condensed Matter 5, 5189 (1993). S. A. Linde, A. Ya. Mikhailova, V. I. Pakhomov, V. V. Kirilenko, and V. G. Shulga, Koord. Khimiya 9, 998 (1983). A. V. Kityk, A. V. Zadorozhna, Ya. I. Shchur, L. Yu. Martynyuk-Lototska, and O. G. Vlokh, phys. stat. sol. (b) 210, 35 (1998). 1974 1983; 9 1998; 210 1998; 43 1992; 34 1993; 5 1978 |
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| Snippet | The lattice dynamics of Cs2HgCl4 crystals and its relation to the pressure induced proper ferroelastic instability is analyzed using a rigid‐ion model in the... |
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| Title | Lattice Instability of Cs2HgCl4 Crystals |
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