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Mobility of Charge Carriers in a Single Crystal and Nanoceramic of the Superionic Pb1 – xSnxF2 Conductor (x = 0.2)

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Abstract

A crystallophysical model of ion transfer in the superionic Pb1 – xSnxF2 conductor with a fluorite (CaF2) structure is proposed. The concentration dependence of the ionic conductivity of Pb1 – xSnxF2 single crystals and poly- and nanocrystals is analyzed. The single-crystal form of the superionic conductor is characterized by the highest conductivity. The mobility and concentration of anionic charge carriers in a single crystal and ceramics of Pb1 – xSnxF2 (x = 0.2) is calculated on the basis of structural and electrophysical data. The mobility of carriers μmob = 2.5 × 10–6 cm2/s V (at 293 K) in a single crystal is seven times higher than in nanoceramic. The concentration of carriers nmob = 1.7 × 1021 and 3.6 × 1021 cm3 (4.5 and 9.5% of the total number of anions) for a single crystal and nanoceramic, respectively. The comparison of isostructural Pb0.8Sn0.2F2, Pb0.67Cd0.33F2, and Pb0.9Sc0.1F2.1 single crystals shows that anionic carriers have a maximum mobility in the β-PbF2 and SnF2 based solid solution.

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Funding

This work was supported by the Ministry of Science and Higher Education within the works on the state task for the Federal Research Center “Crystallography and Photonics” of the Shubnikov Institute of Crystallography of the Russian Academy of Sciences.

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  1. Federal Research Center Crystallography and Photonics, Shubnikov Institute of Crystallography, Russian Academy of Sciences, 119333, Moscow, Russia

    N. I. Sorokin

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  1. N. I. Sorokin
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Correspondence to N. I. Sorokin.

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Translated by E. Glushachenkova

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Sorokin, N.I. Mobility of Charge Carriers in a Single Crystal and Nanoceramic of the Superionic Pb1 – xSnxF2 Conductor (x = 0.2). Phys. Solid State 61, 2014–2018 (2019). https://doi.org/10.1134/S1063783419110362

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  • DOI: https://doi.org/10.1134/S1063783419110362

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