【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。更多还原

【Abstract】 With srhexaferrites fine particles prepared by mechanical alloying and subsequent heat,treatment,the influence of milling conditions on the magnetic properties of SrFe₁2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更多还原