Annealing temperature effects on the structural and magnetocaloric properties of La0.75Dy0.05Sr0.2MnO3

IF 2.5 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Applied Physics A Pub Date : 2025-05-09 DOI:10.1007/s00339-025-08567-y

M. Baccari, A. Elghoul, A. Krichene, W. Boujelben, N. Chniba Boudjada

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引用次数: 0

Abstract

The search for efficient magnetic refrigerants near room temperature is still motivating the scientific committee. In this context, we have tried to study the effect of annealing temperature on the structural, magnetic and magnetocaloric properties of the La_0.75Dy_0.05Sr_0.2MnO₃ compound, synthesized by the sol–gel method. The structural analysis revealed the coexistence of both rhombohedral R \(\overline{3 }\) c and orthorhombic Pnma structural phases, with the presence of some impurities for the nanosized compound sintered at 800 °C. All the samples display a ferromagnetic–paramagnetic transition, with the presence of a glassy state at low temperatures. Reducing the sintering temperature from 1200 °C to 1000 °C shifts the Curie point to higher temperatures, which can be linked to the weakening of superexchange interactions. The results of the magnetocaloric study show that the compound sintered at 1000 °C exhibits an important relative cooling power (80.05 J.kg⁻¹) under a magnetic field of 2 T at 285 K, which suggests that this compound is a potential candidate for magnetic cooling near room temperature.

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退火温度对La0.75Dy0.05Sr0.2MnO3结构和磁热性能的影响

寻找接近室温的高效磁性制冷剂仍在激励着科学委员会。在此背景下，我们试图研究退火温度对溶胶-凝胶法合成的La0.75Dy0.05Sr0.2MnO3化合物的结构、磁性和磁热性能的影响。结构分析表明，在800℃下烧结的纳米级化合物存在菱形R \(\overline{3 }\) c和正交Pnma结构相，并存在一些杂质。所有样品都表现出铁磁-顺磁转变，并在低温下呈现玻璃态。将烧结温度从1200℃降低到1000℃，使居里点温度升高，这可能与超交换相互作用的减弱有关。磁热学研究结果表明，在285 K、2 T磁场下，1000℃烧结的化合物具有重要的相对冷却能力（80.05 J.kg−1），表明该化合物是室温附近磁冷却的潜在候选者。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Applied Physics A 工程技术-材料科学：综合

CiteScore

4.80

自引率

7.40%

发文量

964

审稿时长

38 days

期刊介绍： Applied Physics A publishes experimental and theoretical investigations in applied physics as regular articles, rapid communications, and invited papers. The distinguished 30-member Board of Editors reflects the interdisciplinary approach of the journal and ensures the highest quality of peer review.