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作者:

Zeng, Hong (Zeng, Hong.) | Wu, Ying (Wu, Ying.) | Zhang, Jiuxing (Zhang, Jiuxing.) | Kuang, Chunjiang (Kuang, Chunjiang.) | Yue, Ming (Yue, Ming.) (学者:岳明) | Chen, Ying (Chen, Ying.) | Zhou, Shaoxiong (Zhou, Shaoxiong.)

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EI Scopus

摘要:

Magnetic, magnetocaloric, electrical properties of nanocrystalline and coarse-grained gadolinium (Gd) metals were compared in the present work. The bulk nanocrystalline matels have been consolidated from Gd nanoparticles using spark plasma sintering technique. With the decrease of Gd grain size from micrometer to nanometer range, Curie temperature of the nanocrystalline Gd shifts by more than 6 K below that of coarse-grained and the magnetic moment per Gd atom at 5 K dropped noticeably from 7.81uB to 6.31uB. Magnetic entropy change of crystalline Gd drops surprising from 10.07 to 4.47 Jkg-1·K-1 at ΔH=5 T; adiabatic temperature change drops from 3.5 K to 1.1 K with ΔH=1.5 T. However, magnetocaloric effect of the nanocrystalline metals exhibit a more constant tendency. The room temperature electrical resistivity increases from 209.68 to 333.04 uΩ cm, while the low temperature electrical resistivity is found to increase surprisingly from 16.51 to 126.30 uΩ cm.

关键词:

Electric conductivity Metals Nanocrystals Temperature Magnetic properties Spark plasma sintering Drops Gadolinium Nanocrystalline alloys Electric properties Magnetic moments Magnetocaloric effects

作者机构:

  • [ 1 ] [Zeng, Hong]Advance Technology and Materials Co., Ltd., China Iron and Steel Research Institute Group, Beijing 100081, China
  • [ 2 ] [Wu, Ying]Advance Technology and Materials Co., Ltd., China Iron and Steel Research Institute Group, Beijing 100081, China
  • [ 3 ] [Zhang, Jiuxing]Key Laboratory of Advanced Functional Materials, Ministry of Education Beijing University of Technology, Beijing 100124, China
  • [ 4 ] [Kuang, Chunjiang]Advance Technology and Materials Co., Ltd., China Iron and Steel Research Institute Group, Beijing 100081, China
  • [ 5 ] [Yue, Ming]Key Laboratory of Advanced Functional Materials, Ministry of Education Beijing University of Technology, Beijing 100124, China
  • [ 6 ] [Chen, Ying]ARC Centre of Excellence for Functional Nanomaterials, Institute for Frontier Materials, Deakin University, WaurnPonds, VIC 3216, Australia
  • [ 7 ] [Zhou, Shaoxiong]Advance Technology and Materials Co., Ltd., China Iron and Steel Research Institute Group, Beijing 100081, China

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年份: 2013

卷: 2

页码: 1729-1736

语种: 英文

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