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Influence of Ba Substitutions on Microstructure and Magnetic Properties of La–Ca–Co System Permanent Ferrite

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Abstract

La0.6Ca0.4−xBaxO⋅n/2(Fe1−yCoy)2O3(x = 0, 0.05, 0.1, 0.15 and 0.2) permanent ferrite materials were prepared by ceramic technique. The topography and the structure were characterized by scanning electron microscopy (SEM) and x-ray diffraction (XRD), respectively. The magnetic properties were measured using vibrating sample magnetometer (VSM) and digital magnetometer. Single M-phase and flake-like grains were obtained for samples without Ba substitution(x = 0), and the magnetic properties of the pre-sintering La–Ca–Co ferrite were as follows: Br = 440 mT, Hcb = 296 kA/m, Hcj = 426 kA/m, (BH)max = 36.6 kJ/m3 and Hk/Hcj = 0.83. When Ca was substituted by Ba, pre-sintered powder presents single M-phase structure and close three-dimensional size of grains, resulting in an improved rectangle ratio of sintered magnet. The rectangle ratio of sintered magnet reaches a maximum of 0.93 when x = 0.1. By optimizing process parameters, M-type La–Ca–Ba–Co sintered magnet was prepared with Br = 445 mT, Hcb = 337 kA/m, Hcj = 420 kA/m, (BH)max = 38.6 kJ/m3 and Hk/Hcj = 0.95.

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Funding

This work was supported by Scientific Research Fund of BGRIMM Technology Group (no. 2016-16), Youth Innovation Fund Project of BGRIMM Technology Group (nos. QCJ-201820 and QCJ201809), and National Natural Science Foundation of China (no. 51401023).

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Authors and Affiliations

  1. National Engineering Technology Research Center for Magnetic Materials, BGRIMM, Beijing, 102600, China

    X. W. Zhou, Z. W. Geng, R. M. Liu, D. M. Zhu, L. Y. Jia, Q. Wang, K. M. Huang, J. Xiong, G. H. Hu & B. S. Li

  2. BGRIMM Magnetic Materials and Technology Co., Ltd., Beijing, 102600, China

    X. W. Zhou, R. M. Liu, D. M. Zhu & B. S. Li

Authors
  1. X. W. Zhou
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  2. Z. W. Geng
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  3. R. M. Liu
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  4. D. M. Zhu
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  5. L. Y. Jia
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  6. Q. Wang
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  7. K. M. Huang
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  8. J. Xiong
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  9. G. H. Hu
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  10. B. S. Li
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Correspondence to R. M. Liu.

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Zhou, X.W., Geng, Z.W., Liu, R.M. et al. Influence of Ba Substitutions on Microstructure and Magnetic Properties of La–Ca–Co System Permanent Ferrite. J Supercond Nov Magn 32, 1253–1259 (2019). https://doi.org/10.1007/s10948-018-4796-3

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  • DOI: https://doi.org/10.1007/s10948-018-4796-3

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