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Physics of the Solid State

, Volume 59, Issue 5, pp 986–991 | Cite as

Thermal, optical, and dielectric properties of fluoride Rb2TaF7

  • E. I. Pogorel’tsevEmail author
  • S. V. Mel’nikova
  • A. V. Kartashev
  • M. V. Gorev
  • I. N. Flerov
  • N. M. Laptash
Phase Transitions

Abstract

The thermal, optical, and dielectric properties of fluoride Rb2TaF7 were investigated. It was observed that the variation in chemical pressure in fluorides A 2 +TaF7 caused by the cation substitution of rubidium for ammonium does not affect the ferroelastic nature of structural distortions, but leads to stabilization of the high- and low-temperature phases and enhancement of birefringence. The entropy of the phase transition P4/nmmCmma is typical of the shift transformations, which is consistent with a model of the initial and distorted phase structures. The anisotropy of chemical pressure causes the change of signs of the anomalous strain and baric coefficient dT/dp of Rb2TaF7 as compared with the values for its ammonium analog.

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Copyright information

© Pleiades Publishing, Ltd. 2017

Authors and Affiliations

  • E. I. Pogorel’tsev
    • 1
    • 2
    Email author
  • S. V. Mel’nikova
    • 1
  • A. V. Kartashev
    • 1
    • 3
  • M. V. Gorev
    • 1
    • 2
  • I. N. Flerov
    • 1
    • 2
  • N. M. Laptash
    • 4
  1. 1.Kirensky Institute of Physics, Federal Research Center, Siberian BranchRussian Academy of SciencesKrasnoyarskRussia
  2. 2.Siberian Federal UniversityKrasnoyarskRussia
  3. 3.Krasnoyarsk State Pedagogical UniversityKrasnoyarskRussia
  4. 4.Institute of Chemistry, Far East BranchRussian Academy of SciencesVladivostokRussia

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