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Enhanced reversibility of the magnetoelastic transition in(Mn,Fe)2(P,Si)alloys via minimizing the transition-induced elastic strain energy

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Journal of Materials Science & Technology 2022年第8期103卷 165-176页

作者： Xuefei Miao Yong Gong Fengqi Zhang Yurong You luana caron Fengjiao Qian Wenhui Guo Yujing Zhang Yuanyuan Gong Feng Xu Niels van Dijk Ekkes Brück MIIT Key Laboratory of Advanced Metallic and Intermetallic Materials Technology School of Materials Science and EngineeringNanjing University of Science and TechnologyNanjing 210094China Fundamental Aspects of Materials and Energy Department of Radiation Science and TechnologyDelft University of TechnologyMekelweg 15DelftJB 2629Netherlands Department of Physics Bielefeld UniversityBielefeld 33501Germany Helmholtz-Zentrum Berlin für Materialien und Energie Berlin 12489Germany College of Physics Nanjing University of Aeronautics and AstronauticsNanjing 210016China

Magnetocaloric materials undergoing reversible phase transitions are highly desirable for magnetic refrigeration applications.(Mn,Fe)_(2)(P,Si)alloys exhibit a giant magnetocaloric effect accompanied by a magnetoelastic transition,while the noticeable irreversibility causes drastic degradation of the magnetocaloric properties during consecutive cooling *** the present work,we performed a comprehensive study on the magnetoelastic transition of the(Mn,Fe)_(2)(P,Si)alloys by high-resolution transmission electron microscopy,in situ field-and temperature-dependent neutron powder diffraction as well as density functional theory calculations(DFT).We found a generalized relationship between the thermal hysteresis and the transition-induced elastic strain energy for the(Mn,Fe)_(2)(P,Si)*** thermal hysteresis was greatly reduced from 11 to 1 K by a mere 4 at.%substitution of Fe by Mo in the Mn_(1.15)Fe_(0.80)P_(0.45)Si_(0.55)*** reduction is found to be due to a strong reduction in the transition-induced elastic strain *** significantly enhanced reversibility of the magnetoelastic transition leads to a remarkable improvement of the reversible magnetocaloric properties,compared to the parent *** on the DFT calculations and the neutron diffraction experiments,we also elucidated the underlying mechanism of the tunable transition temperature for the(Mn,Fe)_(2)(P,Si)family,which can essentially be attributed to the strong competition between the covalent bonding and the ferromagnetic exchange *** present work provides not only a new strategy to improve the reversibility of a first-order magnetic transition but also essential insight into the electron-spin-lattice coupling in giant magnetocaloric materials.

关键词： Magnetocaloric effect (Mn Fe)2(P Si) Hysteresis Neutron diffraction

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Anomalous thermal expansion and enhanced magnetocaloric effect in<001>-textured Mn_(x)Fe_(5-x)Si_(3) alloys

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Rare Metals 2024年第5期43卷 2263-2274页

作者： Yong Gong Xue-Fei Miao Tapas Samanta Chris Taake Jun Liu Feng-Jiao Qian Yan-Yan Shao Yu-Jing Zhang Qing-Yong Ren luana caron Feng Xu MIIT Key Laboratory of Advanced Metallic and Intermetallic Materials Technology School of Materials Science and EngineeringNanjing University of Science and TechnologyNanjing210094China Department of Physics Bielefeld University33501BielefeldGermany College of Physics Nanjing University of Aeronautics and AstronauticsNanjing210016China Institute of High Energy Physics Chinese Academy of SciencesBeijing100049China Spallation Neutron Source Science Center Dongguan523803China Guangdong-Hong Kong-Macao Joint Laboratory for Neutron Scattering Science and Technology Dongguan523803China Department of Physics Bielefeld University33501BielefeldGermany Helmholtz-Zentrum Berlin für Materialien und Energie12489BerlinGermany

The development of zero and negative therma expansion(i.e.,ZTE and NTE)materials is of crucial importance to the control of undesirable thermal expansion for high-precision *** the present work,ZTE and NTE were obtained in directionally-solidified Mn_(x)Fe_(5-x)Si_(3)alloys with a strongtexture,in striking contrast to positive thermal expansion in their isotropic counterparts Magnetometry and in-situ X-ray diffraction(XRD)measurements were performed to uncover the origin of the anomalous thermal *** measurements indicate a strong easy-plane magnetocrystalline anisotropy in the textured samples,where the magnetic moments are aligned within the ab plane of the hexagonal structure Temperature-dependent XRD on the x=1 sample reveals a ZTE character in the ab plane that is coupled to a ferromagnetic *** a result,the macroscopic ZTE(~0.22×10^(-6)K^(-1))in the x=1 sample can be attributed to the microscopic magneto volume effect within the ab plane,which is realized by the introduction of the-textured ***,the competition between antiferromagnetic and ferromagnetic exchange coupling leads to NTE in textured x=1.5 and 2 ***,textured x=1 sample displays enhanced magnetocaloric properties as compared to the conventional counterparts with randomly-oriented *** this work demonstrates a new strategy toward the exploration of anomalous thermal expansion properties as well as the enhancement of magnetocaloric properties for materials with a strong magnetocrystalline anisotropy.

关键词： MnFeySis Magnetocaloric effect Magnetic phase transition Negative thermal expansion

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MnFePSi巨磁熵变合金相变可逆性调控及其机制研究

MnFePSi巨磁熵变合金相变可逆性调控及其机制研究

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中国稀土学会2021学术年会

作者：缪雪飞龚勇徐锋 luana caron Chin-Wei Wang Niels van Dijk Ekkes Brück 南京理工大学 Bielefeld University National Synchrotron Radiation Research Center Delft University of Technology

基于磁热效应的室温磁制冷技术,因其具有绿色环保、高效节能、稳定低噪等显著优点,有望颠覆传统蒸气压缩制冷技术,应用到日常生活、医疗卫生、交通运输、国防科技等领域,具有重要的社会价值和经济价值。(Mn,Fe)(P,Si)合金因其价格低廉... 详细信息

基于磁热效应的室温磁制冷技术,因其具有绿色环保、高效节能、稳定低噪等显著优点,有望颠覆传统蒸气压缩制冷技术,应用到日常生活、医疗卫生、交通运输、国防科技等领域,具有重要的社会价值和经济价值。(Mn,Fe)(P,Si)合金因其价格低廉、工作温域易于调控、磁热性能优异等显著特性,在室温磁制冷领域具有重要应用前景。然而,(Mn,Fe)(P,Si)合金存在着热滞大、相变可逆性差等问题,限制了其在制冷循环中的制冷效率。(Mn,Fe)(P,Si)合金的热滞与其一级磁弹相变密切相关,本研究利用球差透射电镜、原位变温/变磁场中子衍射和第一性原理计算等手段,深入研究了其一级磁弹相变过程,建立了该体系热滞与相变诱导弹性应变能之间的关联性,并通过成分调控,实现了超低热滞,极大增强了其可逆磁热性能。本研究不仅揭示了一级磁相变材料中电子-晶格-自旋强耦合作用,也为巨磁熵变材料的应用提供了理论指导。

关键词：磁热效应 (Mn,Fe)2(P,Si) 滞后中子衍射

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