Fluorine Conducting Ceramics Based on BiF3

IF 0.6 4区材料科学 Q4 CRYSTALLOGRAPHY Crystallography Reports Pub Date : 2024-07-25 DOI:10.1134/S1063774524600431

N. I. Sorokin

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Abstract

The temperature dependence of the ionic conductivity of a Bi_0.94Ba_0.06F_2.94 solid electrolyte ceramic sample has been studied by impedance spectroscopy in the temperature range of 293–473 K. The ceramics obtained by the solid-state synthesis (873 K, 3 h) in a closed Cu ampoule is a heterovalent solid solution of tysonite structure (sp. gr. \(P\bar {3}c1\)) with the lattice parameters a = 7.1482(8) Å and c = 7.3279(5) Å. The room-temperature conductivity and its activation enthalpy are, respectively, σ_cer = 3 × 10⁻⁵ S/cm and ΔH_σ = 0.49 ± 0.05 eV. The ion-conducting properties of the isostructural Bi\(_{{1 - y}}\)Ba_yF\(_{{3 - y}}\) and La\(_{{1 - y}}\)Ba_yF\(_{{3 - y}}\) solid electrolytes with similar ionic radii of the matrix cations (1.17 and 1.16 Å for Bi³⁺ and La³⁺, respectively) have been compared. The conductivity of Bi_0.94Ba_0.06F_2.94 ceramics at 473 K exceeds the electrical conductivity of La_0.95Ba_0.05F_2.95 ceramics and single crystal by factors of 6 and 3.3, respectively.

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基于 BiF3 的氟导电陶瓷

通过阻抗光谱法研究了 Bi0.94Ba0.06F2.94 固体电解质陶瓷样品在 293-473 K 温度范围内离子电导率的温度依赖性。\室温电导率及其活化焓分别为 σcer = 3 × 10-5 S/cm 和 ΔHσ = 0.49 ± 0.05 eV。比较了基体阳离子离子半径相似（Bi3+ 和 La3+分别为 1.17 和 1.16 Å）的等结构 Bi\(_{{1 - y}}\)BayF\(_{{3 - y}}\ 和 La\(_{{1 - y}}\)BayF\(_{{3 - y}}\ 固体电解质的离子导电特性。在 473 K 下，Bi0.94Ba0.06F2.94 陶瓷的电导率分别比 La0.95Ba0.05F2.95 陶瓷和单晶体的电导率高出 6 倍和 3.3 倍。

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来源期刊

Crystallography Reports 化学-晶体学

CiteScore

1.10

自引率

28.60%

发文量

审稿时长

4-8 weeks

期刊介绍： Crystallography Reports is a journal that publishes original articles short communications, and reviews on various aspects of crystallography: diffraction and scattering of X-rays, electrons, and neutrons, determination of crystal structure of inorganic and organic substances, including proteins and other biological substances; UV-VIS and IR spectroscopy; growth, imperfect structure and physical properties of crystals; thin films, liquid crystals, nanomaterials, partially disordered systems, and the methods of studies.