Na5Gd4F(SiO4)4 中的大低温磁致效应

IF 1.8 3区工程技术 Q3 PHYSICS, APPLIED

Cryogenics Pub Date : 2024-10-01 DOI:10.1016/j.cryogenics.2024.103955

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引用次数: 0

摘要

基于磁性材料磁致效应的绝热退磁制冷一直被认为是达到亚开尔文温度的有效技术。本文研究了 Na5Gd4F(SiO4)4 化合物的磁性能和 MCE。由于 Na5Gd4F(SiO4)4 具有较高的 Gd3+ 离子/阴离子配位比和弱磁相互作用，因此在 2.6 K 条件下，当磁场变化为 0-7 T 时，Na5Gd4F(SiO4)4 的磁熵变化高达 49.6 J-kg-1-K-1，超过了相同条件下的商用磁性制冷剂 Gd3Ga5O12。此外，在 0-7 T 的磁场变化下，其制冷量和相对制冷功率分别达到 308.9 J-kg-1 和 406.7 J-kg-1。这些特性表明，Na5Gd4F(SiO4)4 化合物是一种很有前途的磁性制冷材料。

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Large cryogenic magnetocaloric effect in Na5Gd4F(SiO4)4

The adiabatic demagnetization refrigeration based on the magnetocaloric effect of magnetic materials has been regarded as an effective technology to attain sub-Kelvin temperature. In this article, the magnetic properties and MCE of Na₅Gd₄F(SiO₄)₄ compound are investigated. Due to the high Gd³⁺ ion/anion ligand ratio and weak magnetic interaction, Na₅Gd₄F(SiO₄)₄ exhibits a large magnetic entropy change of 49.6 J·kg⁻¹·K⁻¹ under magnetic field change of 0–7 T at 2.6 K, which surpasses the commercial magnetic refrigerant Gd₃Ga₅O₁₂ under the same conditions. Besides, its refrigeration capacity and the relative cooling power under magnetic field change of 0–7 T reaches up to 308.9 J·kg⁻¹ and 406.7 J·kg⁻¹, respectively. These properties indicate that Na₅Gd₄F(SiO₄)₄ compound is a promising magnetic refrigeration material.

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来源期刊

Cryogenics 物理-热力学

CiteScore

3.80

自引率

9.50%

发文量

审稿时长

2.1 months

期刊介绍： Cryogenics is the world''s leading journal focusing on all aspects of cryoengineering and cryogenics. Papers published in Cryogenics cover a wide variety of subjects in low temperature engineering and research. Among the areas covered are: - Applications of superconductivity: magnets, electronics, devices - Superconductors and their properties - Properties of materials: metals, alloys, composites, polymers, insulations - New applications of cryogenic technology to processes, devices, machinery - Refrigeration and liquefaction technology - Thermodynamics - Fluid properties and fluid mechanics - Heat transfer - Thermometry and measurement science - Cryogenics in medicine - Cryoelectronics