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工程轻元素修改的LaFe_11.6Si_1.4化合物使可调节的巨型磁热效应成为可能

Fengqi Zhang^1,2, Ziying Wu², Xiaofang Zhang³

¹JC STEM Lab of Energy and Materials Physics, Department of Physics, City University of Hong Kong, Kowloon, Hong Kong SAR, 999077, China.

Advanced science (Weinheim, Baden-Wurttemberg, Germany)

|May 19, 2025

概括

在La,Fe,Si) ₁₃材料中添加轻元素的兴奋剂提高了用于磁热制冷的基里温度. 兴奋剂保持了巨大的磁热效应,显示了固态冷却技术的前景.

科学领域:

材料科学材料科学材料科学
固态物理固态物理
热力学是一种热力学.

背景情况:

磁热制冷为传统的基于压缩的冷却提供了一个有希望的替代方案.
基于La,Fe,Si的材料是实际磁热应用的关键候选者.
提高基里温度和调整巨型磁热效应 (GMCE) 对发展至关重要.

研究的目的:

为了研究轻元素 (C,F,S) 兴奋剂对LaFe_11.6Si_1.4化合物的特性的影响.
探索提高基里温度 (T_C) 和实现可调节的GMCE的策略.
了解兴奋剂,微观结构和磁热性能之间的关系.

主要方法:

对轻元素 (C,F,S) 修饰的LaFe_11.6Si_1.4化合物的系统实验研究.
对库里温度 (T_C),热歇斯底里斯和磁变化 (R) 的分析.
确定剂部位占用率,微观结构观察,并分析转移稳定的原子变化.

主要成果:

所有被兴奋的样本都表现出T_C的增加,对热歇斯底里的影响最小.
兴奋剂维持了显著的GMCE,最大磁变化为19.2 J kg^-1 K^-1 在2 T.
间歇性兴奋剂在转移T_C方面被证明更有效,但由于改变了杂交,兴奋剂破坏了第一阶段的过渡.

结论:

间歇性兴奋剂是一种有效的策略,用于增加La (Fe,Si) 材料中的T_C.
格子压力和共价杂交之间的相互作用对于控制磁热性质至关重要.
兴奋剂提供了一种可行的途径,以保持GMCE,同时增强T_C用于先进的制冷.

关键词:

拉 (Fe,Si) 13 (Fe,Si) 13 (Fe,Si) 13 (Fe,Si) 13 (La) (Fe,Si) 13 (La) (Fe,Si) 13 (La) (Fe,Si) 13 (La) (Fe,Si) 13 (La) (Fe,Si) 13 (La) (Fe,Si) 13 (La) (Fe,Si) 13 (La) (Fe,Si) 13 (La) (Fe,Si) 13 (La) (Fe,Si) 13 (La) (Fe,Si) 13 (La) (Fe,Si) 13 (La) (La) (Fe,Si) 13 (La) (Fe,Si) 13 (La) (Fe,Si) 13 (La)光元素的兴奋剂是光元素的兴奋剂.磁热热能能量转换的转换.磁热性材料是一种磁热性材料.同步 X 射线和中子衍射的同步 X 射线和中子衍射.

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