Comparative analysis of magnetocaloric effect in La0.67-xEuxBa0.33Mn0.85Fe0.15O3 (x = 0 and 0.1) polycrystalline manganites: experimental vs. theoretical determination

IF 1.7 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

Journal of Electroceramics Pub Date : 2024-07-20 DOI:10.1007/s10832-024-00358-w

Aïda Ben Jazia Kharrat, Nassira Chniba-Boudjada, Wahiba Boujelben

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Abstract

This research study explores the magnetic and magnetocaloric properties of La_0.67-xEu_xBa_0.33Mn_0.85Fe_0.15O₃ (x = 0 and 0.1) magnetic compounds elaborated using the Sol–Gel method, based on a phenomenological approach proposed by Mahmoud Aly Hamad. The studied compounds exhibit a second-order ferromagnetic (FM) to paramagnetic (PM) transition with increasing temperature. A correlation between the experimental measurements and the theoretical analysis is established. Indeed, the value of the magnetocaloric effect was determined from the theoretical model based on magnetization as a function of temperature at several magnetic fields. Under an applied magnetic field of 5T, the absolute values of the maximum magnetic entropy change are evaluated at 0.92 and 0.60 J kg⁻¹ K⁻¹ for x = 0 and 0.1 respectively. This reduction may be attributed to a Curie temperature distribution implying also a decrease in the relative cooling power (RCP). The RCP and the specific heat capacity values are also estimated thanks to this model. The results predicted by this model allow us to propose these compounds as promising candidates for magnetic refrigeration.

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La0.67-xEuxBa0.33Mn0.85Fe0.15O3（x = 0 和 0.1）多晶锰矿中磁致效应的比较分析：实验与理论测定结果对比

本研究以 Mahmoud Aly Hamad 提出的现象学方法为基础，探讨了利用溶胶-凝胶法制备的 La0.67-xEuxBa0.33Mn0.85Fe0.15O3 （x = 0 和 0.1）磁性化合物的磁性和磁致性。随着温度的升高，所研究的化合物表现出二阶铁磁性（FM）向顺磁性（PM）的转变。实验测量与理论分析之间建立了相关性。事实上，磁致效应的值是根据磁化率与温度在不同磁场下的函数关系的理论模型确定的。在 5T 的外加磁场下，x = 0 和 0.1 时的最大磁熵变化绝对值分别为 0.92 和 0.60 J kg-1 K-1。这一下降可能归因于居里温度分布，也意味着相对冷却功率（RCP）的下降。该模型还估算了 RCP 和比热容值。根据该模型预测的结果，我们建议将这些化合物作为磁制冷的理想候选物质。

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来源期刊

Journal of Electroceramics 工程技术-材料科学：硅酸盐

CiteScore

2.80

自引率

5.90%

发文量

审稿时长

5.7 months

期刊介绍： While ceramics have traditionally been admired for their mechanical, chemical and thermal stability, their unique electrical, optical and magnetic properties have become of increasing importance in many key technologies including communications, energy conversion and storage, electronics and automation. Electroceramics benefit greatly from their versatility in properties including: -insulating to metallic and fast ion conductivity -piezo-, ferro-, and pyro-electricity -electro- and nonlinear optical properties -feromagnetism. When combined with thermal, mechanical, and chemical stability, these properties often render them the materials of choice. The Journal of Electroceramics is dedicated to providing a forum of discussion cutting across issues in electrical, optical, and magnetic ceramics. Driven by the need for miniaturization, cost, and enhanced functionality, the field of electroceramics is growing rapidly in many new directions. The Journal encourages discussions of resultant trends concerning silicon-electroceramic integration, nanotechnology, ceramic-polymer composites, grain boundary and defect engineering, etc.