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Peculiarities of the low-symmetry phase structure near the phase-transition point (1993)

Chechin, G. M. ; Ipatova, E. A. ; Sakhnenko, V. P.

[S.l.] : International Union of Crystallography (IUCr)

Acta crystallographica 49 (1993), S. 824-831

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ISSN: 1600-5724

Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Topics: Chemistry and Pharmacology , Geosciences , Physics

Notes: The structure of the low-symmetry phase near the transition point depends on the number of arbitrary parameters, which is smaller than that determined by the space group GD of this phase. Such a feature gives rise to some nontrivial structural effects in the vicinity of the transition point: there are numerical relationships among the displacements of the atoms belonging to different orbits of the GD group. In some cases, atoms may be displaced in a direction not singled out by symmetry in any of the 230 space groups. These effects are revealed by group-theoretical methods and the Landau concept of one irreducible representation.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1107/S0108767393003824

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