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.

中文翻译：

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LaF3晶体中阴离子电导率的高温异常

摘要

超离子 LaF ₃导体单晶的阴离子电导率 σ _dc ( T ) 在较宽的温度范围 (312–1073 K) 内通过阻抗谱进行了研究。已在氮气保护气氛中进行了电气测量。结果表明，在研究的温度范围内， σ _dc值从 1.5 × 10 ^–5变化到 7 × 10 ^–2 S/cm（约 5 × 10 ^3倍）。在T ₀ ≈ 970 K处发现了σ _dc ( T ) 依赖性的高温异常，这显然表明 LaF 中开始发生弥散（法拉第）相变。₃泰索尼特结构。