La/Ba/Fe/ eu基锰矿复合材料的磁热效应及临界行为研究

IF 3.2 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

Journal of Sol-Gel Science and Technology Pub Date : 2025-06-18 DOI:10.1007/s10971-025-06845-y

A. Ben Jazia Kharrat, W. Boujelben

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引用次数: 0

摘要

本研究采用溶胶-凝胶法合成La0.67Ba0.33Mn0.85Fe0.15O3（样品C1）和La0.57Eu0.1Ba0.33Mn0.85Fe0.15O3（样品C2）化合物，形成复合材料。测定了C1和C2的居里温度分别为170 K和100 K。这两种化合物都表现出相对较低的磁热特性。为了增强MC效应，对C1和C2组成的复合材料进行了理论研究。结果表明，优化后的复合材料由80%的C1和20%的C2组成，其居里温度为110 K，具有磁制冷应用的潜力。从修正的Arrott图和Kouvel-Fisher方法中提取的精炼临界指数β、γ和δ表明，复合材料的磁性行为遵循平均场模型。四种模型对La0.67Ba0.33Mn0.85Fe0.15O3/La0.57Eu0.1Ba0.33Mn0.85Fe0.15O3复合材料相对斜率（RS）的温度依赖性

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Investigation on magnetocaloric effect and critical behaviour of a La/Ba/Fe/Eu-based manganite composite

In this study, La_0.67Ba_0.33Mn_0.85Fe_0.15O₃ (sample C1) and La_0.57Eu_0.1Ba_0.33Mn_0.85Fe_0.15O₃ (sample C2) compounds were synthesized using the sol-gel method to form a composite material. The Curie temperatures of C1 and C2 were determined to be 170 K and 100 K, respectively. Both compounds exhibited relatively low magnetocaloric (MC) properties. To enhance the MC effect, a theoretical investigation was conducted on a composite composed of C1 and C2. The results indicate that the optimized composite, consisting of 80% C1 and 20% C2, exhibits a Curie temperature of 110 K and shows potential for magnetic refrigeration applications. The refined critical exponents β, γ, and δ, extracted from modified Arrott plots and the Kouvel-Fisher method, suggest that the composite’s magnetic behavior follows the mean-field model.

Graphical Abstract

Temperature dependence of the relative slope (RS) of the La_0.67Ba_0.33Mn_0.85Fe_0.15O₃/La_0.57Eu_0.1Ba_0.33Mn_0.85Fe_0.15O₃ composite using the four studied models.

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来源期刊

Journal of Sol-Gel Science and Technology 工程技术-材料科学：硅酸盐

CiteScore

4.70

自引率

4.00%

发文量

280

审稿时长

2.1 months

期刊介绍： The primary objective of the Journal of Sol-Gel Science and Technology (JSST), the official journal of the International Sol-Gel Society, is to provide an international forum for the dissemination of scientific, technological, and general knowledge about materials processed by chemical nanotechnologies known as the "sol-gel" process. The materials of interest include gels, gel-derived glasses, ceramics in form of nano- and micro-powders, bulk, fibres, thin films and coatings as well as more recent materials such as hybrid organic-inorganic materials and composites. Such materials exhibit a wide range of optical, electronic, magnetic, chemical, environmental, and biomedical properties and functionalities. Methods for producing sol-gel-derived materials and the industrial uses of these materials are also of great interest.