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Magnetic properties of M-type strontium ferrites with different heat treatment conditions 被引量:2
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作者 Namji Oh Seungyeon Park +3 位作者 yongwan kim Hyukmin Kwon Sangsub kim Kyoungmook Lim 《Rare Metals》 SCIE EI CAS CSCD 2020年第1期84-88,共5页
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 Sr0.06Ca0.52La0.52Fe11.68Co0.22O1... 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 Sr0.06Ca0.52La0.52Fe11.68Co0.22O19magnetic powder was prepared by a standard ceramic process.During experiments,the calcination temperature was varied from 1180 to 1260℃,and sintering temperature was fixed.While the M-phase(SrFe12O19)existed with hematite(Fe2 O3)in the powder calcined at below 1220℃,the pure M-phase was observed in the powder calcined at over1240℃.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+-OFe3+superexchange interaction,and the coercivity decreases by the large particle sizes due to the grain growth. 展开更多
关键词 M-type ferrites Standard CERAMIC process Phase analysis SUPEREXCHANGE PERMANENT MAGNET
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