New anion-conducting solid solutions Bi1-xTex(O,F) 2+δ (x > 0.5) and glass-ceramic material on their base

V. A. Prituzhalov, E. I. Ardashnikova, A. A. Vinogradov, V. A. Dolgikh, J. J. Videau, E. Fargin, A. M. Abakumov, N. V. Tarakina, G. Van Tendeloo

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3 Citations (Scopus)

Abstract

The anion-excess fluorite-like solid solutions with general composition Bi1-xTex(O,F)2+δ (x > 0.5) have been synthesized by a solid state reaction of TeO2, BiF3 and Bi2O3 at 873 K with following quenching. The homogeneity areas and polymorphism of the I ↔ IV Bi1-xTex(O,F) 2+δ phases were investigated. The crystal structure of the low temperature IV-Bi1-xTex(O,F)2+δ phase has been solved using electron diffraction and X-ray powder diffraction (a = 11.53051(9) , S.G. Ia-3, RI = 0.046, RP = 0.041). Glass formation area in the Bi2O3-BiF3-TeO 2 (10% TiO2) system was investigated. IVBi 1-xTex(O,F)2+δ phase starts to crystallize at short-time (0.5-3 h) annealing of oxyfluoride glasses at temperatures above Tg (600-615 K). The ionic conductivity of the crystalline Bi1-xTex(O,F)2+δ phase and corresponding glass-ceramics was investigated. Activation energy of conductivity Ea = 0.41(2) eV for the IV-Bi1-xTex(O,F) 2+δ crystalline samples and Ea = 0.73 eV for the glass-ceramic samples were obtained. Investigation of the oxyfluoride samples with a constant cation ratio demonstrates essential influence of excess fluorine anions on the ionic conductivity.

Original languageEnglish
Pages (from-to)1110-1116
Number of pages7
JournalJournal of Fluorine Chemistry
Volume132
Issue number12
DOIs
Publication statusPublished - Dec 2011
Externally publishedYes

Keywords

  • Anion conductivity
  • Crystal structure
  • Fluorite
  • Glass-ceramics
  • Oxyfluorides

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