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<p>In this work, pressure-dependent ionic transport and relaxation properties of Pb<sub>0.7</sub>Sn<sub>0.3</sub>F<sub>2</sub> (lead tin fluoride; LTF) solid solutions are investigated for the first time for highly conductive fluoride ion conductors. The LTF material was prepared using the mechanochemical synthesis technique at room temperature, and its structural properties were examined by X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques. The LTF material exhibits a cubic β-PbF<sub>2</sub> fluorite-type structure. A nanopowder of LTF was obtained with a crystallite size of 40&#xa0;nm, and the nanosized grains were confirmed by SEM. Hydrostatic pressure up to 18&#xa0;kbar was applied to the LTF material, and electrical impedance measurements were performed in the 180–340&#xa0;K range. The DC ionic conductivity was extracted at different temperatures and pressures. It was found that the ionic conductivity decreases with increasing applied pressure, albeit with no change in its activation energy of 0.33&#xa0;eV. Analysis of the conductivity spectra suggests that the applied pressure leads to the suppression of the mobility of fluoride ions, resulting in reduced ionic conductivity. The activation volume was estimated to be between 1.37 and 2.09 cm<sup>3</sup>/mol in the 220–300&#xa0;K range, which is comparable to other fast/superionic conductors. The dielectric constant also decreases with applied pressure in the low-frequency region due to decreased ionic conduction. The relaxation time determined from the impedance and the dielectric loss is found to increase with pressure, with an activation volume of 2.01 and 1.8&#xa0;cm<sup>3</sup>/mol, respectively.</p>

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Effect of pressure on the ionic conduction and relaxation properties of Pb0.7Sn0.3F2 fluoride ion conductors

  • 期刊论文

  • 发表日期：

    2025年8月23日

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  • Mohamad M. Ahmad

摘要

In this work, pressure-dependent ionic transport and relaxation properties of Pb0.7Sn0.3F2 (lead tin fluoride; LTF) solid solutions are investigated for the first time for highly conductive fluoride ion conductors. The LTF material was prepared using the mechanochemical synthesis technique at room temperature, and its structural properties were examined by X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques. The LTF material exhibits a cubic β-PbF2 fluorite-type structure. A nanopowder of LTF was obtained with a crystallite size of 40 nm, and the nanosized grains were confirmed by SEM. Hydrostatic pressure up to 18 kbar was applied to the LTF material, and electrical impedance measurements were performed in the 180–340 K range. The DC ionic conductivity was extracted at different temperatures and pressures. It was found that the ionic conductivity decreases with increasing applied pressure, albeit with no change in its activation energy of 0.33 eV. Analysis of the conductivity spectra suggests that the applied pressure leads to the suppression of the mobility of fluoride ions, resulting in reduced ionic conductivity. The activation volume was estimated to be between 1.37 and 2.09 cm3/mol in the 220–300 K range, which is comparable to other fast/superionic conductors. The dielectric constant also decreases with applied pressure in the low-frequency region due to decreased ionic conduction. The relaxation time determined from the impedance and the dielectric loss is found to increase with pressure, with an activation volume of 2.01 and 1.8 cm3/mol, respectively.