Anomalous thermal expansion and enhanced magnetocaloric effect in<001>-textured MnxFe5-xSi3 alloys

Yong Gong ¹Xue-Fei Miao ¹Tapas Samanta ²Chris Taake ²Jun Liu ¹Feng-Jiao Qian ³Yan-Yan Shao ¹Yu-Jing Zhang ¹Qing-Yong Ren ⁴Luana Caron ⁵Feng Xu¹

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作者信息

1. MIIT Key Laboratory of Advanced Metallic and Intermetallic Materials Technology,School of Materials Science and Engineering,Nanjing University of Science and Technology,Nanjing 210094,China
2. Department of Physics,Bielefeld University,33501 Bielefeld,Germany
3. College of Physics,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China
4. Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China;Spallation Neutron Source Science Center,Dongguan 523803,China;Guangdong-Hong Kong-Macao Joint Laboratory for Neutron Scattering Science and Technology,Dongguan 523803,China
5. Department of Physics,Bielefeld University,33501 Bielefeld,Germany;Helmholtz-Zentrum Berlin für Materialien und Energie,12489 Berlin,Germany
折叠

Abstract

The development of zero and negative thermal expansion(i.e.,ZTE and NTE)materials is of crucial importance to the control of undesirable thermal expansion for high-precision devices.In the present work,ZTE and NTE were obtained in directionally-solidified MnxFe5-xSi3 alloys with a strong<001>texture,in striking contrast to positive thermal expansion in their isotropic counterparts.Magnetometry and in-situ X-ray diffraction(XRD)mea-surements were performed to uncover the origin of the anomalous thermal expansion.Magnetic 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 fer-romagnetic transition.As 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<001>-textured microstructure.Besides,the competition between antiferromagnetic and ferromagnetic exchange coupling leads to NTE in textured x=1.5 and 2 samples.Addi-tionally,textured x=1 sample displays enhanced magne-tocaloric properties as compared to the conventional counterparts with randomly-oriented grains.Consequently,this work demonstrates a new strategy toward the explo-ration of anomalous thermal expansion properties as well as the enhancement of magnetocaloric properties for materials with a strong magnetocrystalline anisotropy.

Key words

MnFe4Si3/Magnetocaloric effect/Magnetic phase transition/Negative thermal expansion

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基金项目

National Natural Science Foundation of China(12004179)

National Natural Science Foundation of China(U1832191)

National Natural Science Foundation of China(51801102)

National Natural Science Foundation of China(52271180)

National Natural Science Foundation of China(52001167)

National Natural Science Foundation of China(52101236)

Guangdong-Hong Kong-Macao Joint Laboratory for Neutron Scattering Science and Technology()

Fundamental Research Funds for the Central Universities(30922010802)

Sino-German Mobility Program from the Sino-German Center for Research Promotion(SGC)(M-0447)

出版年

2024

稀有金属(英文版)

中国有色金属学会

稀有金属(英文版)

CSTPCDEI

影响因子：0.801

ISSN：1001-0521

参考文献量60

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