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Study of charge carrier mobility in superionic conductor La0.95Sr0.05F2.95 by electric modulus spectroscopy
Russian version
Sorokin N. I. 1
1Shubnikov Kurchatov Institute of Crystallography of the Kurchatov Institute of Crystallography and Photonics, Moscow, Russian Federation
Email: nsorokin1@yandex.ru
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The spectra of the complex electric modulus M^*(ν)=M'+ iM'' for a single crystal of the superionic conductor La0.95Sr0.05F2.95 with the tysonite structure (space group P3c1) were studied in the frequency ranges of 10-1-107 Hz and temperatures of 133-273 K. The diagrams of the complex electric modulus M^*(ν) are characterized by a distribution of the dielectric relaxation time of charge carriers (fluorine vacancies). Relaxation peaks caused by the mobility of ion carriers are observed on the frequency dependences of the imaginary part of the electric modulus M''(ν). Based on the temperature change in the position of the relaxation maxima, the average hopping frequency, carrier mobility and activation enthalpy of ion transfer were calculated, which are νh=3.1·107 Hz, μmob=1.5·10-7 cm2/(sV) at room temperature (293 K, extrapolation) and Δ Hh=0.37±0.02 eV, respectively. Keywords: dielectric spectroscopy, superionic conductor, lanthanum fluoride, strontium fluoride, tysonite structure, complex electrical module.
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