以50:50和75:25的比例组合Pr0.63Dy0.07Sr0.3/La0.8Dy0.2MnO3锰矿石对磁制冷技术改进的影响

IF 2.8 3区物理与天体物理 Q2 PHYSICS, CONDENSED MATTER

Physica B-condensed Matter Pub Date : 2025-04-25 DOI:10.1016/j.physb.2025.417310

R. Hamdi , D. Ramotar , S.S. Hayek , A. Samara , S.A. Mansour , Y. Haik

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引用次数: 0

摘要

研究了Pr0.63Dy0.07Sr0.3MnO3 （PrDySr）、La0.8Dy0.2MnO3 （LaDy）及其复合材料（50:50和75:25）的结构、磁性和磁热性能，以评估其在先进冷却技术中的适用性。结构分析证实了纳米晶的存在，在所有样品中表现出一致的正交结构。磁性测量表明，在居里温度附近有明显的铁磁到顺磁相变，以及在阻塞温度下的固态冻结行为。在所测试的体系中，50:50的复合材料表现出优异的磁热性能，达到了207.12(1)J/kg的等温熵变，在4 T磁场中表现出显著的相对冷却能力。这些发现将50:50的复合材料定位为一种非常有前途的节能磁制冷材料，具有卓越的性能和实用性。

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The impact of combining Pr0.63Dy0.07Sr0.3/La0.8Dy0.2MnO3 manganites at a ratio of 50:50 and 75:25 on the improvement of magnetic refrigeration technique

Structural, magnetic, and magnetocaloric properties of Pr_0.63Dy_0.07Sr_0.3MnO₃ (PrDySr), La_0.8Dy_0.2MnO₃ (LaDy), and their composites (50:50 and 75:25) were meticulously examined to assess their applicability in advanced cooling technologies. Structural analysis verified the presence of nanosized crystallites exhibiting a consistent orthorhombic structure across all samples. Magnetic measurements indicated a clear ferromagnetic-to-paramagnetic phase transition close to the Curie temperature, as well as solid-state freezing behavior at the blocking temperature. Among the examined systems, the 50:50 composite displayed outstanding magnetocaloric performance, attaining an extraordinary isothermal entropy change of 207.12(1) J/kg and exhibiting significant relative cooling power in a 4 T magnetic field. These findings position the 50:50 composite as a highly promising material for energy-efficient magnetic refrigeration, offering both superior performance and practical applicability.

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来源期刊

Physica B-condensed Matter 物理-物理：凝聚态物理

CiteScore

4.90

自引率

7.10%

发文量

703

审稿时长

44 days

期刊介绍： Physica B: Condensed Matter comprises all condensed matter and material physics that involve theoretical, computational and experimental work. Papers should contain further developments and a proper discussion on the physics of experimental or theoretical results in one of the following areas: -Magnetism -Materials physics -Nanostructures and nanomaterials -Optics and optical materials -Quantum materials -Semiconductors -Strongly correlated systems -Superconductivity -Surfaces and interfaces