机械合金化制备各向同性SrFe_(12)O_(19)磁性的研究  

Magnetic Properties of Isotropic SrFe_12O_19 Fine Particles Prepared by Mechanical Alloying

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作  者:金志强[1] 唐卫[1] 章建荣[1] 林浩 都有为[1] 

机构地区:[1]南京大学物理系

出  处:《材料科学与工艺》1997年第4期21-25,共5页Materials Science and Technology

摘  要:用机械合金化方法制备了各向同性M型SrFe12O19磁性粉末,系统地研究了球磨条件对磁性的影响。结果表明,在相结构转变上,低温退火与长时间球磨起着相似的作用。当样品在75~800℃退火处理时,饱和磁化强度Ms比矫顽力Hc受球磨条件影响更明显。采用高能球磨制备的各向同性样品,在球磨30h后于1000℃退火处理,其饱和和磁化强度和矫顽力可分别达到300kA/m和448kA/m。延长热处理时间对磁性影响不大。退磁曲线表明矫顽力场相应于磁化过程中的钉扎和成核场。With srhexaferrites fine particles prepared by mechanical alloying and subsequent heat,treatment,the influence of milling conditions on the magnetic properties of SrFe_12O_19 compounds have been systematically investigated,and it is found that annealing treatment at a low temperature can play a similar role in structural transformation as the long time milling processFor samples annealed at 750~800℃,their saturation magnetization Ms values are more sensitive to milling conditions than their coercivity values HcMaximum Ms of 300kA/m and Hc of 448kA/m have been obtained with isotropic powders annealed at 1000℃ after being milled for 30h by using high energy millBy prolonging annealing time,little change in magnetic saturation and coercivity is observed in powders and short annealing time results in low propertiesThe coercive field Hc,as determined from the demagnetization curve corresponds to the pinning or nucleation field

关 键 词:机械合金化 饱和磁化强度 矫顽力 硬磁铁氧体 

分 类 号:TM277.5[一般工业技术—材料科学与工程]

 

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