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Magnetic properties of M-type strontium ferrites with different heat treatment conditions

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Abstract

The effects of heat treatment conditions on the magnetic properties and microstructure of M-type strontium ferrite according to calcination temperature were analyzed. Strontium ferrite Sr0.06Ca0.52La0.52Fe11.68Co0.22O19 magnetic powder was prepared by a standard ceramic process. During experiments, the calcination temperature was varied from 1180 to 1260 °C, and sintering temperature was fixed. While the M-phase (SrFe12O19) existed with hematite (Fe2O3) in the powder calcined at below 1220 °C, the pure M-phase was observed in the powder calcined at over 1240 °C. With an increase in the calcination temperature, the magnetization of the calcined powder increases, meanwhile, the coercivity decreases. The magnetization is improved by decreasing the lattice constant c and activating the Fe3+–O–Fe3+ superexchange interaction, and the coercivity decreases by the large particle sizes due to the grain growth.

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Correspondence to Kyoungmook Lim.

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Oh, N., Park, S., Kim, Y. et al. Magnetic properties of M-type strontium ferrites with different heat treatment conditions. Rare Met. 39, 84–88 (2020) doi:10.1007/s12598-019-01251-0

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Keywords

  • M-type ferrites
  • Standard ceramic process
  • Phase analysis
  • Superexchange
  • Permanent magnet