{"title":"Fluorine Conducting Ceramics Based on BiF3","authors":"N. I. Sorokin","doi":"10.1134/s1063774524600431","DOIUrl":null,"url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The temperature dependence of the ionic conductivity of a Bi<sub>0.94</sub>Ba<sub>0.06</sub>F<sub>2.94</sub> 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. <span>\\(P\\bar {3}c1\\)</span>) with the lattice parameters <i>a</i> = 7.1482(8) Å and <i>c</i> = 7.3279(5) Å. The room-temperature conductivity and its activation enthalpy are, respectively, σ<sub>cer</sub> = 3 × 10<sup>−5</sup> S/cm and Δ<i>H</i><sub>σ</sub> = 0.49 ± 0.05 eV. The ion-conducting properties of the isostructural Bi<span>\\(_{{1 - y}}\\)</span>Ba<sub><i>y</i></sub>F<span>\\(_{{3 - y}}\\)</span> and La<span>\\(_{{1 - y}}\\)</span>Ba<sub><i>y</i></sub>F<span>\\(_{{3 - y}}\\)</span> solid electrolytes with similar ionic radii of the matrix cations (1.17 and 1.16 Å for Bi<sup>3+</sup> and La<sup>3+</sup>, respectively) have been compared. The conductivity of Bi<sub>0.94</sub>Ba<sub>0.06</sub>F<sub>2.94</sub> ceramics at 473 K exceeds the electrical conductivity of La<sub>0.95</sub>Ba<sub>0.05</sub>F<sub>2.95</sub> ceramics and single crystal by factors of 6 and 3.3, respectively.</p>","PeriodicalId":527,"journal":{"name":"Crystallography Reports","volume":null,"pages":null},"PeriodicalIF":0.6000,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Crystallography Reports","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1134/s1063774524600431","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"CRYSTALLOGRAPHY","Score":null,"Total":0}
引用次数: 0
Abstract
The temperature dependence of the ionic conductivity of a Bi0.94Ba0.06F2.94 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, σcer = 3 × 10−5 S/cm and ΔHσ = 0.49 ± 0.05 eV. The ion-conducting properties of the isostructural Bi\(_{{1 - y}}\)BayF\(_{{3 - y}}\) and La\(_{{1 - y}}\)BayF\(_{{3 - y}}\) 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 Bi0.94Ba0.06F2.94 ceramics at 473 K exceeds the electrical conductivity of La0.95Ba0.05F2.95 ceramics and single crystal by factors of 6 and 3.3, respectively.
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.
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