Effect of x-ray irradiation on magnetocaloric materials, (MnNiSi)1-x(Fe2Ge)x and LaFe13-x-yMnxSiyHz

IF 1.8 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Research Express Pub Date : 2024-09-17 DOI:10.1088/2053-1591/ad791f

John Peter J Nunez, Vaibhav Sharma, Jessika V Rojas, Radhika Barua and Ravi L Hadimani

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Abstract

Understanding the behavior of magnetocaloric materials when exposed to high-energy x-ray irradiation is pivotal for advancing magnetic cooling technologies under extreme environments. This study investigates the magnetic and structural changes of two well-studied magnetocaloric materials, (MnNiSi)1−x(Fe2Ge)x composition (x = 0.34) and LaFe13-x-yMnxSiyHz composition (x = 0.30,y = 0.1.26 and z = 1.53) alloys upon irradiation. The alloys were exposed to x-ray radiation with a dosage of a continuous sweeping rate of ∼>120 Gy min−1 and an absorbed dose of 35 kGy . Both the samples didn’t show any observable crystal change after irradiation. There was a considerable change in magnetization at low applied magnetic fields in magnetization versus temperature measurements from 2.72 emu g−1 to 4.01 emu g−1 in the irradiated (MnNiSi)1−x(Fe2Ge)x sample and 4.41 emu g−1 to 5.49 emu/g for the LaFe13-x-yMnxSiyHz alloys. The Magnetization versus magnetic field isotherms near transition temperature exhibited irradiation-induced magnetic hysteresis for the (MnNiSi)1−x(Fe2Ge)x (x = 0.34) while the LaFe13-x-yMnxSiyHz samples did not result in any irradiation-induced magnetic hysteresis. In both the samples the magnitude of entropy change did not change due to irradiation however, the peak entropy change shifted to different temperatures in both the samples, (MnNiSi)1−x(Fe2Ge)x (x = 0.34), showed a maximum entropy change, ΔSmag of ∼ 11.139 J/kgK at 317.5 K compared to ΔSmag of ∼ 11.349 J/kgK at Tave peak of 312.5 K for the irradiated sample. LaFe13-x-yMnxSiyHz, pristine sample exhibited a maximum magnetic entropy change, ΔSmag ∼ 18.663 J/kgK, with the corresponding peak temperature, Tave peak, of 295 K compared to ΔSmag ∼ 18.736 J/kgK, at Tave peak of 300 K. It was determined that irradiation applied to the samples did not induce any structural or magnetic phase changes in the selected compositions but rather modified the magnetic properties marginally.

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X 射线辐照对磁致性材料 (MnNiSi)1-x(Fe2Ge)x 和 LaFe13-x-yMnxSiyHz 的影响

了解磁致性材料在受到高能 X 射线辐照时的行为，对于在极端环境下推进磁冷却技术至关重要。本研究调查了两种经过充分研究的磁致性材料在辐照时的磁性和结构变化，这两种材料是由 (MnNiSi)1-x(Fe2Ge)x 组成（x = 0.34）和 LaFe13-x-yMnxSiyHz 组成（x = 0.30、y = 0.1.26 和 z = 1.53）的合金。合金受到的 X 射线辐照剂量为连续扫描速率 ∼>120 Gy min-1，吸收剂量为 35 kGy。两种样品在辐照后都没有出现任何可观察到的晶体变化。在低外加磁场下，磁化率随温度变化的测量结果显示，辐照 (MnNiSi)1-x(Fe2Ge)x 样品的磁化率从 2.72 emu g-1 上升到 4.01 emu g-1，LaFe13-x-yMnxSiyHz 合金的磁化率从 4.41 emu g-1 上升到 5.49 emu/g。转变温度附近的磁化与磁场等温线显示，(MnNiSi)1-x(Fe2Ge)x (x = 0.34) 具有辐照诱导的磁滞现象，而 LaFe13-x-yMnxSiyHz 样品则没有任何辐照诱导的磁滞现象。在这两种样品中，熵变化的幅度并没有因为辐照而发生变化，但是，在这两种样品中，熵变化的峰值都转移到了不同的温度，(MnNiSi)1-x(Fe2Ge)x (x = 0.(MnNiSi)1-x(Fe2Ge)x(x=0.34)在 317.5 K 时显示出最大熵变 ΔSmag ∼ 11.139 J/kgK，而辐照样品在 312.5 K 的熵变峰值时显示出最大熵变 ΔSmag ∼ 11.349 J/kgK。LaFe13-x-yMnxSiyHz 原始样品的磁熵变化最大，ΔSmag ∼ 18.663 J/kgK，相应的峰值温度 Tave 峰值为 295 K，而 Tave 峰值为 300 K 时的ΔSmag ∼ 18.736 J/kgK。

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来源期刊

Materials Research Express MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

4.50

自引率

4.30%

发文量

640

审稿时长

12 weeks

期刊介绍： A broad, rapid peer-review journal publishing new experimental and theoretical research on the design, fabrication, properties and applications of all classes of materials.