Fluorine conducting ceramics based on BiF3
- Authors: Sorokin N.I.1
-
Affiliations:
- Shubnikov Institute of Crystallography of Kurchatov Complex of Crystallography and Photonics of NRC “Kurchatov Institute”
- Issue: Vol 69, No 3 (2024)
- Pages: 522-527
- Section: НАНОМАТЕРИАЛЫ, КЕРАМИКА
- URL: https://ruspoj.com/0023-4761/article/view/673193
- DOI: https://doi.org/10.31857/S0023476124030188
- EDN: https://elibrary.ru/XNVMBG
- ID: 673193
Cite item
Abstract
The temperature dependence of the ionic conductivity of a ceramic sample of the Bi0.94Ba0.06F2.94 solid electrolyte was studied using impedance spectroscopy in the temperature range 293–473 K. The ceramics was obtained by solid-phase synthesis (873 K, 3 h) in a closed Cu ampoule and is a heterovalent solid solution of tysonite structure (space group) with lattice parameters a = 7.1482(8) and c = 7.3279(5) Å. The conductivity value at room temperature and its activation enthalpy are equal to σcer = 3 × 10–5 S/cm and DHs = 0.49 ± 0.05 eV, respectively. The ion-conducting properties of isostructural solid electrolytes Bi1–yBayF3–y and La1–yBayF3–y with similar values of ionic radii of matrix cations (1.17 and 1.16 Å for Bi3+ and La3+, respectively) are compared. The conductivity at 473 K of Bi0.94Ba0.06F2.94 ceramics exceeds the electrical conductivity of ceramics and La0.95Ba0.05F2.95 single crystals by 6 and 3.3 times, respectively.
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About the authors
N. I. Sorokin
Shubnikov Institute of Crystallography of Kurchatov Complex of Crystallography and Photonics of NRC “Kurchatov Institute”
Author for correspondence.
Email: nsorokin1@yandex.ru
Russian Federation, Moscow
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