The role of Mn in the stabilization of adiabatic temperature changes of LaFe11.2−xMnxCo0.7Si1.1 alloys in an alternating magnetic field

IF 9.6 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Rare Metals Pub Date : 2025-04-03 DOI:10.1007/s12598-025-03266-2

Adler Gamzatov, Nurizhat Abdulkadirova, Kamil Kamilov, Akhmed Batdalov, Akhmed Aliev, Piotr Gebara, Hu Zhang

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Abstract

The results of the study of the effect of partial substitution of Fe by Mn in the LaFe_11.2−xMn_xCo_0.7Si_1.1 system on magnetization, specific heat, magnetostriction and magnetocaloric effect are presented. Direct measurements of the adiabatic temperature change (∆T_ad) were carried out in alternating magnetic fields (AMF) using the magnetic field modulation method. Partial substitution of Fe atoms by Mn atoms leads to a shift in the Curie temperature (T_C) towards lower temperatures without a noticeable deterioration in magnetic properties. A correlation was found between the structural component of the magnetocaloric effect and the stability of the frequency of the ∆T_ad in the AMFs—an increase in the manganese concentration leads to a decrease in magnetostriction and to a lower dependence of ∆T_ad on the frequency of the magnetic field. Estimates of the specific cooling power Q_C as a function of the frequency of the AMF showed that the highest value of Q_C at f = 20 Hz in a magnetic field of 12 kOe is 26.3 W g⁻¹ and is observed for the composition with x = 0.1. This value is higher than that of Gd, for which, under the same conditions, Q_C = 21.6 W g⁻¹. All the samples studied show stability of the value of ΔT_ad without any sign of deterioration of the effect up to 60,000 cycles of switching on/off of the magnetic field of 12 kOe. The discovered frequency and cyclic stability of ΔT_ad of the studied samples increase their prospects for application in magnetic cooling technology.

Graphical Abstract

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Mn对交变磁场下LaFe11.2−xMnxCo0.7Si1.1合金绝热温度变化的稳定作用

本文研究了在LaFe11.2−xMnxCo0.7Si1.1体系中，Mn部分取代Fe对磁化、比热、磁致伸缩和磁热效应的影响。采用磁场调制法在交变磁场（AMF）中直接测量绝热温度变化（∆Tad）。铁原子被Mn原子部分取代导致居里温度（TC）向较低温度移动，但磁性能没有明显的恶化。在amfs中，磁热效应的结构成分与∆Tad频率的稳定性之间存在相关性——锰浓度的增加导致磁致伸缩减小，∆Tad对磁场频率的依赖性降低。对特定冷却功率QC作为AMF频率函数的估计表明，在12 kOe的磁场中，f = 20 Hz时QC的最大值为26.3 W g−1，并且在x = 0.1的组合物中观察到。该值高于Gd，在相同条件下，QC = 21.6 W g−1。所研究的所有样品都显示出ΔTad值的稳定性，在12 kOe磁场的6万次开关中没有任何恶化的迹象。所研究样品的频率和ΔTad的循环稳定性增加了它们在磁冷却技术中的应用前景。图形抽象

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

Rare Metals 工程技术-材料科学：综合

CiteScore

12.10

自引率

12.50%

发文量

2919

审稿时长

2.7 months

期刊介绍： Rare Metals is a monthly peer-reviewed journal published by the Nonferrous Metals Society of China. It serves as a platform for engineers and scientists to communicate and disseminate original research articles in the field of rare metals. The journal focuses on a wide range of topics including metallurgy, processing, and determination of rare metals. Additionally, it showcases the application of rare metals in advanced materials such as superconductors, semiconductors, composites, and ceramics.