High-Temperature Anomaly of the Anionic Conductivity in LaF3 Crystals

The anionic electrical conductivity σ dc ( T ) of the superionic LaF 3 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 cha...

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Bibliographic Details
Published in:Crystallography reports 2023-02, Vol.68 (1), p.69-72
Main Author: Sorokin, N. I.
Format: Article
Language:English
Subjects:
Crystallography and Scattering Methods
Electrical measurement
Electrical resistivity
High temperature
Lanthanum fluorides
Phase transitions
Physical Properties of Crystals
Physics
Physics and Astronomy
Single crystals
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Summary:The anionic electrical conductivity σ dc ( T ) of the superionic LaF 3 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 × 10 3 ) in the investigated temperature range. A high-temperature anomaly of the σ dc ( T ) dependence has been found at T 0 ≈ 970 K, which is apparently indicative of the onset of a diffuse (Faraday) phase transition in the LaF 3 tysonite structure.
ISSN:1063-7745
1562-689X
DOI:10.1134/S1063774523010236