Structural transformation between two cubic phases of (NH4)3SnF7

descriptionPublicationkeyboard_double_arrow_right Article 01 Oct 2015 Russian Federation English Publisher:Elsevier BVJournal:Journal of Fluorine Chemistry, volume 178, pages 86-92 (issn: 0022-1139,

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Authors: I.N. Flerov; M.S. Molokeev; N.M. Laptash; A.A. Udovenko; E.I. Pogoreltsev; S.V. Mel’nikova; S.V. Misyul;

doi: 10.1016/j.jfluchem.2015.06.024

Structural transformation between two cubic phases of (NH4)3SnF7

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Abstract

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 capacity, 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.

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Country

Russian Federation

Related Organizations

Siberian Federal University
Russian Federation
Far Eastern State Transport University
Russian Federation

Keywords

Cubic fluorides, X-ray, Phase transitions, Crystal optics, Calorimetry, 540, 530, 29.19

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