Preparation and magnetic properties of high performance Ca–Sr based M-type hexagonal ferrites

Ching Chien Huang*, Chin Chieh Mo, Tsung Han Hsiao, Guan Ming Chen, Sheng Han Lu, Yen Hua Tai, Hsiao Hsuan Hsu*, Chun Hu Cheng*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


In this study, the preparation and magnetic properties of Ca–Sr M-type (Ca1-x-yLaxSryFe10.9CozO19) ferrire magnets were investigated. A M-type singlephase calcined powder was synthesized with a composition of x ​= ​0.45, y ​= ​0.18 and z ​= ​0. And a very high magnetic properties of Br ​= ​5425Gauss and iHc ​= ​4602Oe were obtained by the thermal annealing and secondary fine-milling method in the sintered magnets. The magnetic properties greats exceeds that of traditional Sr–La–Co M-type ferrite, which has been the highest grade M-type hard ferrite. By use of the innovative post-processing method, the improvement could be attributed to about 4% and 0.8% increase in motor torque and motor efficiency in comparison to that of conventional process, which will eventually be used in high-efficiency motors.

Original languageEnglish
Article number100150
JournalResults in Materials
Publication statusPublished - 2020 Dec


  • Ca–Sr based
  • Hard ferrite
  • Iron oxide powder (FeO)
  • Motor
  • Secondary fine-milling
  • Thermal annealing

ASJC Scopus subject areas

  • General Materials Science


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