Phase transitions in fluoride KFe2F6 with tetragonal tungsten bronze structure

Описание

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, Charge ordering, Phase transition, Tetragonal tungsten bronze structure, 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 Показать полностьюtransformation 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.

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Издание

Журнал: JOURNAL OF FLUORINE CHEMISTRY

Выпуск журнала: Vol. 168

Номера страниц: 204-211

ISSN журнала: 00221139

Место издания: LAUSANNE

Издатель: ELSEVIER SCIENCE SA

Авторы

  • 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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