Тип публикации: статья из журнала

Год издания: 2015

Идентификатор DOI: 10.1016/j.jfluchem.2015.06.024

Ключевые слова: Cubic fluorides, Phase transitions, X-ray, Calorimetry, Crystal optics

Аннотация: Reinvestigations of the room temperature structure of ammonium heptafluorostannate (NH4)(3)SnF7=(NH4)(2)SnF6 center dot NH4F = (NH4)(3)[SnF6]F by both powder and single crystal X-ray diffractions have revealed that its real symmetry is Pa-3 (Z = 8) instead of Pin-3m (Z = 1) suggested earlier. Polarizing optical observations, heat cПоказать полностьюapacity, X-ray powder, and single crystal measurements were performed in a wide temperature range (100-420 K). A reversible structural phase transition of the first order between two cubic modifications Pa-3 Pm-3m was found at about T-0 = 360 K. The structural models associated with partially disordered and totally ordered high and low temperature phases, respectively, comply with a large value of phase transition entropy. (C) 2015 Elsevier B.V. All rights reserved.

Журнал: JOURNAL OF FLUORINE CHEMISTRY

Выпуск журнала: Vol. 178

Номера страниц: 86-92

ISSN журнала: 00221139

Место издания: LAUSANNE

Издатель: ELSEVIER SCIENCE SA

• Flerov I.N. (Siberian Federal University)
• Molokeev M.S. (Far Eastern State Transport University)
• Pogoreltsev E.I. (Siberian Federal University)
• Mel'nikova S.V. (L.V. Kirensky Institute of Physics, Siberian Branch of RAS)
• Misyul S.V. (Siberian Federal University)
• Laptash N.M. (Institute of Chemistry, Far Eastern Branch of RAS)
• Udovenko A.A. (Institute of Chemistry, Far Eastern Branch of RAS)

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