Adler Gamzatov, Nurizhat Abdulkadirova, Kamil Kamilov, Akhmed Batdalov, Akhmed Aliev, Piotr Gebara, Hu Zhang
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A correlation was found between the structural component of the magnetocaloric effect and the stability of the frequency of the ∆<i>T</i><sub>ad</sub> in the AMFs—an increase in the manganese concentration leads to a decrease in magnetostriction and to a lower dependence of ∆<i>T</i><sub>ad</sub> on the frequency of the magnetic field. Estimates of the specific cooling power <i>Q</i><sub>C</sub> as a function of the frequency of the AMF showed that the highest value of <i>Q</i><sub>C</sub> at <i>f</i> = 20 Hz in a magnetic field of 12 kOe is 26.3 W g<sup>−1</sup> and is observed for the composition with <i>x</i> = 0.1. This value is higher than that of Gd, for which, under the same conditions, <i>Q</i><sub>C</sub> = 21.6 W g<sup>−1</sup>. All the samples studied show stability of the value of Δ<i>T</i><sub>ad</sub> without any sign of deterioration of the effect up to 60,000 cycles of switching on/off of the magnetic field of 12 kOe. 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Direct measurements of the adiabatic temperature change (∆<i>T</i><sub>ad</sub>) 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 (<i>T</i><sub>C</sub>) 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 ∆<i>T</i><sub>ad</sub> in the AMFs—an increase in the manganese concentration leads to a decrease in magnetostriction and to a lower dependence of ∆<i>T</i><sub>ad</sub> on the frequency of the magnetic field. 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引用次数: 0
摘要
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
The role of Mn in the stabilization of adiabatic temperature changes of LaFe11.2−xMnxCo0.7Si1.1 alloys in an alternating magnetic field
The results of the study of the effect of partial substitution of Fe by Mn in the LaFe11.2−xMnxCo0.7Si1.1 system on magnetization, specific heat, magnetostriction and magnetocaloric effect are presented. Direct measurements of the adiabatic temperature change (∆Tad) 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 (TC) 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 ∆Tad in the AMFs—an increase in the manganese concentration leads to a decrease in magnetostriction and to a lower dependence of ∆Tad on the frequency of the magnetic field. Estimates of the specific cooling power QC as a function of the frequency of the AMF showed that the highest value of QC 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, QC = 21.6 W g−1. All the samples studied show stability of the value of ΔTad 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 ΔTad of the studied samples increase their prospects for application in magnetic cooling technology.
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.
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