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Abstract <p>Lead-containing heterovalent solid solutions <i>R</i><sub>1–<i>y</i></sub>Pb<sub><i>y</i></sub>F<sub>3–<i>y</i></sub> (<i>R</i> is rare-earth elements) with a tysonite-type structure (space group <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(P\bar 3c1\)</EquationSource> <!--NanoTech2560095Ivanovskaya-m1--> </InlineEquation>) are promising solid electrolytes for fluorine-ion current sources. Powder samples of concentrated nanoscale solid solutions <i>R</i><sub>0.85</sub>Pb<sub>0.15</sub>F<sub>2.85</sub> (<i>R</i> = La, Pr) are obtained by mechanochemical synthesis from individual components PbF<sub>2</sub> and LaF<sub>3</sub> (PrF<sub>3</sub>). The lattice parameters are equal to <i>a</i> = 7.1897(7) Å, <i>c</i> = 7.3545(8) Å and <i>a</i> = 7.0843(6) Å, <i>c</i> = 7.2444(7) Å for compositions with <i>R</i> = La and Pr, respectively. The ionic conductivity of cold-pressed <i>R</i><sub>0.85</sub>Pb<sub>0.15</sub>F<sub>2.85</sub> nanoceramics in the temperature range of 297–816 K is studied using impedance spectroscopy. The ionic conductivity values are 2.0 × 10<sup>–3</sup> and 4.3&#xa0;× 10<sup>–3</sup> S/cm (500 K) for La<sub>0.85</sub>Pb<sub>0.15</sub>F<sub>2.85</sub> and Pr<sub>0.85</sub>Pb<sub>0.15</sub>F<sub>2.85</sub> nanoceramics, respectively. The mechanism of ionic conduction is due to the migration of fluorine vacancies along the boundaries of crystalline grains. The conductivity characteristics of <i>R</i><sub>0.85</sub>Pb<sub>0.15</sub>F<sub>2.85</sub> ceramics (<i>R</i> = La, Pr) allow us to consider them as promising fluorine-conducting solid electrolytes for low-temperature research and practical applications.</p>

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On the Ionic Conductivity of Tysonite Nanofluorides R0.85Pb0.15F2.85 (R = La, Pr) Obtained by Mechanosynthesis

  • 期刊论文

  • 发表日期：

    2025年8月1日

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  • N. A. Ivanovskaya,
  • I. I. Buchinskaya,
  • N. I. Sorokin

摘要

Abstract

Lead-containing heterovalent solid solutions R1–yPbyF3–y (R is rare-earth elements) with a tysonite-type structure (space group \(P\bar 3c1\) ) are promising solid electrolytes for fluorine-ion current sources. Powder samples of concentrated nanoscale solid solutions R0.85Pb0.15F2.85 (R = La, Pr) are obtained by mechanochemical synthesis from individual components PbF2 and LaF3 (PrF3). The lattice parameters are equal to a = 7.1897(7) Å, c = 7.3545(8) Å and a = 7.0843(6) Å, c = 7.2444(7) Å for compositions with R = La and Pr, respectively. The ionic conductivity of cold-pressed R0.85Pb0.15F2.85 nanoceramics in the temperature range of 297–816 K is studied using impedance spectroscopy. The ionic conductivity values are 2.0 × 10–3 and 4.3 × 10–3 S/cm (500 K) for La0.85Pb0.15F2.85 and Pr0.85Pb0.15F2.85 nanoceramics, respectively. The mechanism of ionic conduction is due to the migration of fluorine vacancies along the boundaries of crystalline grains. The conductivity characteristics of R0.85Pb0.15F2.85 ceramics (R = La, Pr) allow us to consider them as promising fluorine-conducting solid electrolytes for low-temperature research and practical applications.