Magnetocaloric properties of La0.9K0.1MnO3 and La0.8K0.1Pb0.1MnO3 bulk perovskite manganites

IF 2.8 4区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC Journal of Materials Science: Materials in Electronics Pub Date : 2024-11-25 DOI:10.1007/s10854-024-13873-x

S. Ait Bouzid, N. Elhamouchi, M. Sajieddine, O. Aitmellal, V. Kuncser, A. C. Galca, N. Iacob, M. Enculescu, A. Essoumhi

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Abstract

In the present work, we report the synthesis and investigations of La_0.9K_0.1MnO₃ and La_0.8K_0.1Pb_0.1MnO₃ bulk samples which could be potential magnetocaloric materials for magnetic refrigeration close to room temperature. A flash combustion reaction and sintering at 1200 °C for 10 h are used to prepare the bulk materials. Both compounds crystallized into a rhombohedral structure with R\(\overline{3 }\)c space group confirmed by X-ray powder diffraction results. Scanning electron microscopy analysis, combined with XRD peak profiles is performed to estimate the particle/crystallite size of the samples. Moreover, the Curie temperature, T_C, is found to be higher in lead-rich sample due to the enhancement of the grain size and the Mn³⁺–O–Mn⁴⁺ double exchange (DE) interaction. Therefore, the bulk sample La_0.8K_0.1Pb_0.1MnO₃ shows a room temperature phase transition of 289 K as well as a higher saturation magnetization. The La_0.8K_0.1Pb_0.1MnO₃ bulk compound exhibits a high and sharp peak in magnetic entropy change up to 5.5 Jkg⁻¹ K⁻¹ under 5 T at the magnetic transition temperature T_C. To compare the magnetocaloric performances of the studied compounds, relative cooling power (RCP) was employed. The obtained experimental results revealed that the increase in particle size influences severely the magnetocaloric properties.

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La0.9K0.1MnO3 和 La0.8K0.1Pb0.1MnO3 块状包晶锰酸盐的磁致性质

在本研究中，我们报告了 La0.9K0.1MnO3 和 La0.8K0.1Pb0.1MnO3 块体样品的合成和研究，这些样品可能是用于接近室温的磁制冷的潜在磁致性材料。制备块状材料采用了闪燃反应和在 1200 °C 下烧结 10 小时的方法。X 射线粉末衍射结果证实，这两种化合物都结晶成 R\(\overline{3 }\)c 空间群的斜方体结构。扫描电子显微镜分析结合 X 射线粉末衍射峰图，可以估算出样品的颗粒/晶粒尺寸。此外，由于晶粒尺寸增大和 Mn3+-O-Mn4+ 双交换（DE）相互作用，发现富铅样品的居里温度 TC 较高。因此，块状样品 La0.8K0.1Pb0.1MnO3 的室温相变温度为 289 K，饱和磁化率更高。La0.8K0.1Pb0.1MnO3 块体化合物在 5 T 的磁转变温度 TC 下显示出高而尖锐的磁熵变化峰值，高达 5.5 Jkg-1 K-1。为了比较所研究化合物的磁致冷性能，采用了相对冷却功率（RCP）。实验结果表明，粒度的增加会严重影响磁致性。

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来源期刊

Journal of Materials Science: Materials in Electronics 工程技术-材料科学：综合

CiteScore

5.00

自引率

7.10%

发文量

1931

审稿时长

2 months

期刊介绍： The Journal of Materials Science: Materials in Electronics is an established refereed companion to the Journal of Materials Science. It publishes papers on materials and their applications in modern electronics, covering the ground between fundamental science, such as semiconductor physics, and work concerned specifically with applications. It explores the growth and preparation of new materials, as well as their processing, fabrication, bonding and encapsulation, together with the reliability, failure analysis, quality assurance and characterization related to the whole range of applications in electronics. The Journal presents papers in newly developing fields such as low dimensional structures and devices, optoelectronics including III-V compounds, glasses and linear/non-linear crystal materials and lasers, high Tc superconductors, conducting polymers, thick film materials and new contact technologies, as well as the established electronics device and circuit materials.