Počet záznamů: 1

Symmetry mode analysis of the phase transitions in Rb.sub.2./sub.ZnBr.sub.4./sub..

  1. 1.
    0366892 - FZU-D 2012 RIV DE eng J - Článek v odborném periodiku
    Zúniga, F. J. - Perez-Mato, J. M. - Orobengoa, D. - Petříček, Václav - Breczewski, T.
    Symmetry mode analysis of the phase transitions in Rb2ZnBr4.
    Zeitschrift für Kristallographie. Roč. 226, č. 5 (2010), s. 454-466 ISSN 0044-2968
    Grant ostatní: AV ČR(CZ) Praemium Academiae
    Výzkumný záměr: CEZ:AV0Z10100521
    Klíčová slova: structure analysis * symmetry-adapted modes * structure refinement
    Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
    Impakt faktor: 1.155, rok: 2010

    Crystal structures of low temperature phases III, IV and V of rubidium zinc bromide have been determined by single crystal X-ray diffraction at 90 K, 85 K, and 30 K, respectively. The analysis of the structures in terms of symmetry-adapted modes of the high temperature prototype phase permits the identification of the modes responsible for each phase and to assess its thermal evolution. The primary mode responsible for the incommensurate and lock-in phases remains dominant throughout the whole transition sequence, maintaining its structure and slightly increasing its amplitude as tempera! ture decreases. The two monoclinic phases IV and V are presumably due to the instability of a second mode associated with a single active irreducible representation.
    Trvalý link: http://hdl.handle.net/11104/0201727