HIGH-TEMPERATURE ANOMALY OF THE ANIONIC CONDUCTIVITY IN LaF 3  CRYSTALS

N. I. Sorokin; Сорокин Н. И.

doi:10.31857/S0023476123010253

HIGH-TEMPERATURE ANOMALY OF THE ANIONIC CONDUCTIVITY IN LaF₃ CRYSTALS

Authors: Sorokin N.I.¹
Affiliations:
1. Shubnikov Institute of Crystallography, Federal Scientific and Research Center “Crystallography and Photonics,” Russian Academy of Sciences, Moscow, 119333 Russia
Issue: Vol 68, No 1 (2023)
Pages: 58-61
Section: ФИЗИЧЕСКИЕ СВОЙСТВА КРИСТАЛЛОВ
URL: https://rjmseer.com/0023-4761/article/view/673542
DOI: https://doi.org/10.31857/S0023476123010253
EDN: https://elibrary.ru/DQZAOR
ID: 673542

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Abstract

The anionic electrical conductivity σ_dc(T) of the superionic LaF₃ conductor single crystal has been studied by impedance spectroscopy in a wide (312–1073 K) temperature range. Electrical measurements in a protective nitrogen atmosphere have been carried out. It is shown that the σ_dc values change from 1.5 × 10^–5 to 7 × 10^–2 S/cm (by a factor of ~5 × 10³) in the investigated temperature range. A high-temperature anomaly of the σ_dc(T) dependence has been found at T₀ ≈ 970 K, which is apparently indicative of the onset of a diffuse (Faraday) phase transition in the LaF₃ tysonite structure.

Keywords

ANIONIC ELECTRICAL CONDUCTIVITY, TEMPERATURE DEPENDENCE

About the authors

N. I. Sorokin

Shubnikov Institute of Crystallography, Federal Scientific and Research Center “Crystallography and Photonics,” Russian Academy of Sciences, Moscow, 119333 Russia

Author for correspondence.
Email: nsorokin1@yandex.ru
Россия, Москва

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