Giant cryogenic magnetocaloric effect in mineral of gaudefroyite: Direct and indirect measurements

IF 1.8 3区工程技术 Q3 PHYSICS, APPLIED

Cryogenics Pub Date : 2024-04-23 DOI:10.1016/j.cryogenics.2024.103848

A. Amirov , Yu. Koshkid'ko , R.K. Li , J. Ćwik , A. Mashirov , C. Greaves

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引用次数: 0

Abstract

The magnetic and magnetocaloric properties of gaudefroyite minerals were studied. The magnetocaloric effect was investigated by direct and indirect methods in the temperature range 4.2–40 K and magnetic field up to 10 T. The magnetization was measured in a low magnetic field (200 Oe) with zero-field cooled and field cooling protocol and previous observation of typical spin glass behavior was confirmed. The giant magnetic entropy changes with anisotropic behavior and maximums |ΔS_m|= 17 J kg⁻¹ K⁻¹ (H||c) at 18 K and |ΔS_m|= 20 J kg⁻¹ K⁻¹ (H||ab) at 12 K at an applied magnetic field 10 T were observed. The direct measurements of the magnetocaloric effect demonstrated the maximum of adiabatic temperature changes of ΔT_ad = 11 K at a magnetic field change of 10 T (H||ab) at 11.5 K. Obtained values of magnetocaloric parameters for the mineral of gaudefroyite are comparable to promising materials for magnetic crycooling technologies (for example, hydrogen (LH₂) liquefaction) and have an advantage for the absence of rare-earth elements in the gaudefroyite.

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高德弗罗伊石矿物中的巨低温磁致效应：直接和间接测量

研究了高辉石矿物的磁性和磁致性。在低磁场（200 Oe）、零磁场冷却和磁场冷却协议下测量了磁化，证实了之前观察到的典型自旋玻璃行为。在应用磁场为 10 T 时，观察到巨磁熵随各向异性行为而变化，在 18 K 时达到最大值 |ΔSm|= 17 J kg-1 K-1 (H||c)，在 12 K 时达到最大值 |ΔSm|= 20 J kg-1 K-1 (H||ab)。磁致冷效应的直接测量结果表明，在 11.5 K 时，当磁场变化为 10 T 时，绝热温度变化的最大值为 ΔTad = 11 K (H||ab)。所获得的高辉石矿物的磁致冷参数值与有望用于磁致冷技术的材料（例如氢气 (LH2) 液化）相当，并且高辉石中不含有稀土元素。

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

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