Thermophysical Properties of PbFe0.5Ta0.5O3 Ferroelectric Ceramics with Nanopolar Structure

IF 0.7 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Inorganic Materials Pub Date : 2025-06-30 DOI:10.1134/S0020168525700293

S. N. Kallaev, A. G. Bakmaev, Z. M. Omarov, K. Bormanis

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Abstract

The thermophysical properties of the PbFe_0.5Ta_0.5O₃ relaxor ferroelectric have been studied in the temperature range 150–800 K. We have revealed anomalies in its heat capacity, thermal diffusivity, and thermal conductivity in the region of the broad ferroelectric transition at T_C ≈ 275 K, the Burns temperature T_B ≈ 690 K, and an intermediate temperature T* ≈ 380 K. The anomalous behavior of heat capacity in the temperature range 200–700 K has been shown to be due to three-level states (Schottky anomaly). We have examined prevailing phonon mechanisms of heat transport in the multiferroic with a nanopolar structure. The anomalous behavior of its thermophysical properties in the temperature range T_B > T > T_C has been attributed to the growth and changes in the system of reorientable nanopolar regions. We have demonstrated that studies of thermophysical properties allow one to determine all characteristic temperatures of relaxor ferroelectrics, related to the formation of a nanopolar structure and its variation with temperature. The results of this study are discussed in combination with structure data.

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纳米结构PbFe0.5Ta0.5O3铁电陶瓷的热物理性质

研究了PbFe0.5Ta0.5O3弛豫铁电体在150 ~ 800 K范围内的热物理性质。在TC≈275 K、Burns温度TB≈690 K和中间温度T*≈380 K的宽铁电跃迁区，我们发现了它的热容量、热扩散率和导热系数的异常。在200-700 K温度范围内，热容的异常行为是由三能级态引起的（肖特基异常）。我们研究了具有纳米极结构的多铁体中普遍存在的声子热输运机制。其热物理性质在TB >； T >； TC温度范围内的异常行为归因于可重定向纳米极区系统的生长和变化。我们已经证明，热物理性质的研究允许人们确定弛豫铁电体的所有特征温度，这些温度与纳米极结构的形成及其随温度的变化有关。结合结构数据对研究结果进行了讨论。

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来源期刊

Inorganic Materials 工程技术-材料科学：综合

CiteScore

1.40

自引率

25.00%

发文量

审稿时长

3-6 weeks

期刊介绍： Inorganic Materials is a journal that publishes reviews and original articles devoted to chemistry, physics, and applications of various inorganic materials including high-purity substances and materials. The journal discusses phase equilibria, including P–T–X diagrams, and the fundamentals of inorganic materials science, which determines preparatory conditions for compounds of various compositions with specified deviations from stoichiometry. Inorganic Materials is a multidisciplinary journal covering all classes of inorganic materials. The journal welcomes manuscripts from all countries in the English or Russian language.