Abstract

The thermal diffusivity and thermal conductivity of multiferroics Bi_1 – xHo_xFeO₃ (x = 0–0.20) have been studied in the high-temperature region of 300–1200 K. It is established that alloying with the rare-earth element (holmium) strongly increases the specific heat in a wide temperature range T > 300 K and significantly changes temperature anomalies of the thermal diffusion and thermal conductivity near phase transitions. Dominant mechanisms of phonon heat transfer near the ferroelectric and antiferromagnetic phase transitions are considered. The temperature dependence of the mean free path is determined. The results obtained are discussed along with the structural investigation data.

中文翻译：

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Bifer – Bi x – x Ho x FeO 3（x = 0–0.20）中的传热过程

摘要

在300–1200 K的高温区域研究了多铁Bi _{1 –  x} Ho _x FeO ₃（x = 0–0.20）的热扩散系数和热导率。建立了与稀土元素（ ）在一个宽广的温度范围T > 300 K内会显着增加比热，并在相变附近显着改变热扩散和导热系数的温度异常。考虑了在铁电和反铁磁相变附近的声子传热的主要机理。确定平均自由程的温度依赖性。讨论了获得的结果以及结构研究数据。