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Phase Relationship of the CeCo5-SmCo5 Pseudobinary System

  • Phase Stability and Transformation of Energy Storage Materials
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Abstract

The phase relationships of the CeCo5-SmCo5 pseudobinary system have been studied by means of x-ray powder diffraction (XRD), differential thermal analysis (DTA), thermogravimetric measurements (TGM), and scanning electron microscopy equipped with energy dispersive x-ray spectroscopy (SEM–EDS). The XRD results show that continuous solid solutions were formed in this CeCo5-SmCo5 pseudobinary system, and all the (Ce, Sm)Co5 solid solutions belong to a hexagonal structure with space group P6/mmm. With the increase of Sm content x, the lattice parameter, a, and the cell volume, V, of (Ce1−xSmx)Co5 solid solutions increase linearly, but its lattice parameter, c, decreases linearly. The DTA measurements show that the temperature of the peritectic reaction L + (Ce, Sm)2Co17 → (Ce, Sm)Co5, the liquid phase transition temperature of the reaction L → L + (Ce, Sm)2Co17, and the Curie temperature of the (Ce1−xSmx)Co5 alloys increase almost linearly as x increases from 0 to 1.0. Based on the XRD results and DTA data, the tentative vertical section of the CeCo5-SmCo5 pseudobinary phase diagram has been constructed.

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Acknowledgements

This work was supported by the Guangxi Natural Science Foundation (No: 2021GXNSFAA220081 and No: 2020GXNSFAA159071), National Key Research and Development Program of China (No: 2016YFB0700901) and the National Basic Research Program of China (No: 2014CB643703), and the National Natural Science Foundation of China (No: 51161005 and No: 51601044).

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Authors and Affiliations

  1. School of Mechanical Engineering, Guilin University of Aerospace Technology, Guilin, Guangxi, People’s Republic of China

    Chengfu Xu, Yongquan Yang, Qingyong Su, Xionghui Xie & Tianming Li

  2. School of Material Science and Engineering, Guilin University of Electronic Technology, Guilin, Guangxi, People’s Republic of China

    Chengfu Xu, Jinping Tian, Qingrong Yao, Dongdong Ma, Zhengfei Gu & Guanghui Rao

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  1. Chengfu Xu
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Correspondence to Jinping Tian or Yongquan Yang.

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Xu, C., Tian, J., Yang, Y. et al. Phase Relationship of the CeCo5-SmCo5 Pseudobinary System. JOM 74, 4710–4715 (2022). https://doi.org/10.1007/s11837-022-05439-1

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