Pressure-induced ionic to mixed ionic and electronic conduction transition in solid electrolyte LaF3
Literature Information
Yalan Yan, Hao Liu, Guozhao Zhang, Shuang Tong, Chunxiao Gao, Yonghao Han
The ionic transport properties of solid electrolyte LaF3 were systematically studied under high pressures up to 30.6 GPa with alternate-current impedance spectra measurements and first-principles calculations. From the impedance spectra measurements, LaF3 was found to transform from pure ionic conduction to mixed ionic and electronic conduction at 15.0 GPa, which results from the pressure-induced structural phase transition from a tysonite-type structure to an anti-Cu3Ti-type structure. F− ion migration can be suppressed by pressure, causing a decrease of the ionic conductivity of LaF3. By first-principles calculations, the pressure-dependent diffusion behaviors of the F− ions can be understood. The increased overlap of electron clouds at the interstitial site between rigid La3+ and liquid F− lattices leads to the appearance of electronic conduction in anti-Cu3Ti-type structured LaF3.
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