Abstract

The specific heat and the dielectric permittivity of Bi_0.8Ho_0.2FeO₃ multiferroics have been studied in the wide temperature range 300–750 K. The doping with rare-earth element holmium is found to lead to substantial changes in the temperature dependences of specific heat C_p and dielectric permittivity ε' at high temperatures. The additional contribution to the specific heat is shown can be interpreted as a Schottky anomaly for three-level states which form due to a distortion of the lattice parameters as a result of doping. Additional anomaly characteristic of a phase transition is observed in temperature dependences of C_p and ε'. The results are discussed in combination with the data of structural studies.

中文翻译：

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Bi 0.8 Ho 0.2 FeO 3多铁的比热和介电性能

摘要

已经在300–750 K的宽温度范围内研究了Bi _0.8 Ho _0.2 FeO ₃多铁的比热和介电常数。发现掺入稀土元素to会导致比热的温度依赖性发生重大变化。C _p和高温下的介电常数ε'。对于比热的附加贡献可以被示出为对于三能级状态的肖特基异常，该三能级状态由于掺杂导致的晶格参数的畸变而形成。在C _p的温度依赖性中观察到相变的其他异常特征和ε'。结合结构研究数据讨论了结果。