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2019 Volume 27 Issue 5
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X F Wu, C P Guo, G Cheng, C R Li, J Wang, Y S Du, G H Rao, Z M Du. 2019: Magnetic properties and magnetocaloric effects in(Ho1?xYx)5Pd2 compounds, Chinese Physics B, 28(5): 340-347. doi: 10.1088/1674-1056/28/5/057502
Citation: X F Wu, C P Guo, G Cheng, C R Li, J Wang, Y S Du, G H Rao, Z M Du. 2019: Magnetic properties and magnetocaloric effects in(Ho1?xYx)5Pd2 compounds, Chinese Physics B, 28(5): 340-347. doi: 10.1088/1674-1056/28/5/057502
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Magnetic properties and magnetocaloric effects in(Ho1?xYx)5Pd2 compounds

  • School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;School of Materials Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, China;Guangxi Key Laboratory of Information Materials, Guilin 541004, China

  • School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China

  • School of Materials Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, China;Guangxi Key Laboratory of Information Materials, Guilin 541004, China

  • Fund Project: the National Basic Research Program of China(Grant 2014CB643703)%the National Key Research and Development Program of China(Grant 2016YFB0700901)%the National Natural Science Foundation of China(Grant . 51261004 and 51761007)%Guangxi Natural Science Foundation, China(Grant 2018GXNSFAA294051)
  • The crystal structure, magnetic and magnetocaloric properties of (Ho1?xYx)5Pd2 (x=0, 0.25, and 0.5) compounds are investigated. All the compounds crystallize in a cubic Dy5Pd2-type structure with the space group Fd3m and undergo a second order transition from spin glass (SG) state to paramagnetic (PM) state. The spin glass transition temperatures Tg de-crease from 26 K for x=0 to 13 K for x=0.5. In the PM region, the reciprocal susceptibilities for all the compounds obey the Curie–Weiss law. The paramagnetic Curie temperatures (θp) for Ho5Pd2, (Ho0.75Y0.25)5Pd2, and (Ho0.5Y0.5)5Pd2 are determined to be 32 K, 30 K, and 22 K, respectively, and the corresponding effective magnetic moments (μeff) are 10.8 μB/Ho, 10.3 μB/RE, and 7.5 μB/RE, respectively. Magnetocaloric effect (MCE) is anticipated according to the Maxwell relation, based on the isothermal magnetization curves. For a magnetic field change of 0–5 T, the maximum values of the isothermal magnetic entropy change??SM of the (Ho1?xYx)5Pd2 (x=0, 0.25, and 0.5) compounds are de-termined to be 11.5 J·kg?1·K?1, 11.1 J·kg?1·K?1, and 8.9 K J·kg?1·K?1, with corresponding refrigerant capacity values of 382.3 J·kg?1, 336.2 J·kg?1, and 242.5 J·kg?1, respectively.
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    沈阳化工大学材料科学与工程学院 沈阳 110142

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Magnetic properties and magnetocaloric effects in(Ho1?xYx)5Pd2 compounds

Abstract: The crystal structure, magnetic and magnetocaloric properties of (Ho1?xYx)5Pd2 (x=0, 0.25, and 0.5) compounds are investigated. All the compounds crystallize in a cubic Dy5Pd2-type structure with the space group Fd3m and undergo a second order transition from spin glass (SG) state to paramagnetic (PM) state. The spin glass transition temperatures Tg de-crease from 26 K for x=0 to 13 K for x=0.5. In the PM region, the reciprocal susceptibilities for all the compounds obey the Curie–Weiss law. The paramagnetic Curie temperatures (θp) for Ho5Pd2, (Ho0.75Y0.25)5Pd2, and (Ho0.5Y0.5)5Pd2 are determined to be 32 K, 30 K, and 22 K, respectively, and the corresponding effective magnetic moments (μeff) are 10.8 μB/Ho, 10.3 μB/RE, and 7.5 μB/RE, respectively. Magnetocaloric effect (MCE) is anticipated according to the Maxwell relation, based on the isothermal magnetization curves. For a magnetic field change of 0–5 T, the maximum values of the isothermal magnetic entropy change??SM of the (Ho1?xYx)5Pd2 (x=0, 0.25, and 0.5) compounds are de-termined to be 11.5 J·kg?1·K?1, 11.1 J·kg?1·K?1, and 8.9 K J·kg?1·K?1, with corresponding refrigerant capacity values of 382.3 J·kg?1, 336.2 J·kg?1, and 242.5 J·kg?1, respectively.

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