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Abstract <p>The impedance spectroscopy method was used to study single crystals of (Pb<sub>0.67</sub>Cd<sub>0.33</sub>)<sub>0.7</sub><i>R</i><sub>0.3</sub>F<sub>2.3</sub> solid solutions (<i>R</i> = Ho, Er) with a fluorite structure, the compositions of which correspond to special (saddle) points on the liquidus surface in PbF<sub>2</sub>−CdF<sub>2</sub>−<i>R</i>F<sub>3</sub> ternary systems. Electrophysical measurements of single crystals were performed in the temperature range from 550 to 750 K in the cooling mode. The ionic conductivity values extrapolated to a temperature of 500 K are 2.2 × 10<sup>−5</sup> and 2.6 × 10<sup>−5</sup> S/cm for compositions with <i>R</i> = Ho and Er, respectively. As compared with the isovalent solid solution Pb<sub>0.67</sub>Cd<sub>0.33</sub>F<sub>2</sub>, the ionic conductivity of concentrated ternary solid solutions (Pb<sub>0.67</sub>Cd<sub>0.33</sub>)<sub>0.7</sub><i>R</i><sub>0.3</sub>F<sub>2.3</sub> (<i>R</i> = Ho, Er) and the previously studied (Pb<sub>0.67</sub>Cd<sub>0.33</sub>)<sub>0.75</sub>Lu<sub>0.25</sub>F<sub>2.25</sub> decreases by ~3 orders of magnitude. A possible reason for the sharp decrease in the fluorine-ionic conductivity upon heterovalent substitution in Pb<sub>0.67</sub>Cd<sub>0.33</sub>F<sub>2</sub> is discussed.</p>

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Ionic Conductivity of Concentrated Solid Solutions in PbF2–CdF2–RF3 Systems (R = Ho, Er)

  • 期刊论文

  • 发表日期：

    2026年2月1日

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  • N. I. Sorokin,
  • I. I. Buchinskaya

摘要

Abstract

The impedance spectroscopy method was used to study single crystals of (Pb0.67Cd0.33)0.7R0.3F2.3 solid solutions (R = Ho, Er) with a fluorite structure, the compositions of which correspond to special (saddle) points on the liquidus surface in PbF2−CdF2−RF3 ternary systems. Electrophysical measurements of single crystals were performed in the temperature range from 550 to 750 K in the cooling mode. The ionic conductivity values extrapolated to a temperature of 500 K are 2.2 × 10−5 and 2.6 × 10−5 S/cm for compositions with R = Ho and Er, respectively. As compared with the isovalent solid solution Pb0.67Cd0.33F2, the ionic conductivity of concentrated ternary solid solutions (Pb0.67Cd0.33)0.7R0.3F2.3 (R = Ho, Er) and the previously studied (Pb0.67Cd0.33)0.75Lu0.25F2.25 decreases by ~3 orders of magnitude. A possible reason for the sharp decrease in the fluorine-ionic conductivity upon heterovalent substitution in Pb0.67Cd0.33F2 is discussed.