Тип публикации: статья из журнала
Год издания: 2014
Идентификатор DOI: 10.1016/j.jfluchem.2014.09.031
Ключевые слова: Tetragonal tungsten bronze structure, Phase transition, Charge ordering, Thermal properties
Аннотация: Heat capacity, thermal dilatation, structure, Mossbauer spectra and dielectric permittivity of fluoride KFe2F6 with tetragonal tungsten bronze crystal structure were studied. The as-made sample undergoes two structural phase transitions P4/mbm (T-1 approximate to 340 K) -> Pbam (T-2 approximate to 250 K) -> G(2) and magnetic phase transformation at T-m approximate to 133 K. Heating up to 600-700 K and subsequent cooling in helium atmosphere leads to a change of phase transition temperatures and diffused anomalies in thermal expansion. The results obtained and influence of thermal prehistory of the sample on its physical properties are discussed in the context of previous studies on related fluorides KFe2F6, which sometimes suggest conflicting structural details. (C) 2014 Elsevier B.V. All rights reserved.
Издание
Журнал: JOURNAL OF FLUORINE CHEMISTRY
Выпуск журнала: Vol. 168
Номера страниц: 204-211
ISSN журнала: 00221139
Место издания: LAUSANNE
Издатель: ELSEVIER SCIENCE SA
Персоны
- Gorev M.V. (Siberian Federal University)
- Flerov I.N. (Siberian Federal University)
- Molokeev M.S. (L.V. Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences)
- Kartashev A.V. (L.V. Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences)
- Pogoreltsev E.I. (Siberian Federal University)
- Bayukov O.A. (L.V. Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences)
- Tressaud A. (Institut de Chimie de la Matiere Condensee, CNRS)
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