Chadha Henchiri, Ala Mabrouki, Haishan Zhou, Fatma Argoubi, Shouxi Gu, Qiang Qi, E. Dhahri, M. A. Valente
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引用次数: 0
摘要
采用溶胶-凝胶法制备了La0.9-0.1MnO2.9化合物，旨在获得一种具有有趣的磁致性和热电性能的材料。制备的材料呈斜方晶系，具有 R-3c 空间群。在磁化率与温度关系图中，可以观察到顺磁（PM）-铁磁（FM）转变，居里温度 TC 为 209 K。根据等温磁化曲线计算，样品的磁熵变化峰值以 TC 为中心。总电子密度态（TDOS）显示，自旋上升态具有金属特性，而自旋下降态则具有 Eg = 1.3 eV 的半导体特性。热电性能分析表明，ZT（评估化合物在热电场中的效率）在 420 K 时达到 1.1，表现良好。
Experimental and DFT Study of the Magnetic, Magnetocaloric and Thermoelectrical Properties of the Lacunar La0.9·0.1 MnO2.9 Compound
The La0.9·0.1MnO2.9 compound were prepared by sol–gel method with the aim of obtaining a material with interesting magnetocaloric and thermoelectric properties. The prepared material crystallized in rhombohedric system with R-3c space group. In the magnetization vs. temperature graph, it is observed a paramagnetic (PM)-ferromagnetic (FM) transition with a Curie temperature TC of 209 K. From the fit of hysteresis cycle at 5 K, it is observed that the dominant contribution is ferromagnetic. A magnetic entropy change, calculated from the isothermal magnetization curves, was observed for the sample with a peak centered on TC. The total electronic density states (TDOS) show the coexistence of metallic behavior for spin-up states and semiconductor characteristic, with a Eg = 1.3 eV, for spin-down states. Thermoelectric properties analysis revealed promising behavior with ZT that assesses the efficacy of a compound in a thermoelectric field, reaching 1.1 at 420 K.
期刊介绍：
The Journal of Low Temperature Physics publishes original papers and review articles on all areas of low temperature physics and cryogenics, including theoretical and experimental contributions. Subject areas include: Quantum solids, liquids and gases; Superfluidity; Superconductivity; Condensed matter physics; Experimental techniques; The Journal encourages the submission of Rapid Communications and Special Issues.
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