镨离子掺杂对SrFe_(12)O_(19)结构和磁性的影响  

EFFECT OF Pr^(3+) DOPING CONCENTRATION ON THE STRUCTURE AND MAGNETIC PROPERTIES OF SrFe_(12)O_(19) COMPOUNDS 

作　　者：金志强[1] 靳君[1] 章建荣[1] 都有为[1] 

机构地区：[1]南京大学物理系固体微结构物理国家重点实验室,南京210093

出　　处：《物理学报》1999年第S1期93-97,共5页Acta Physica Sinica

基　　金：国家攀登计划!( 纳米材料科学)( 批准号:NMS07);国家自然科学基金!( 批准号:59671021);江苏省自然科学基金!(

摘　　要：通过机械球磨和后续热处理工艺，制备了镨离子掺杂的各向同性Ｐｒ１ － ｘＳｒｘＦｅ１２ Ｏ１９ 磁性粉末．研究了离子掺杂浓度和退火条件对样品结构和磁性的影响．结果表明，镨离子掺杂导致单相硬磁化合物的形成温度升高．成分的改变不会影响样品的居里温度，而退火温度的升高导致居里温度略有下降．一定含量的镨掺杂可适当增加样品的矫顽力，但导致磁化强度降低．不同成分样品的磁性受退火温度影响规律不同．The isotropic Pr\|doped SrFe\-\{12\}O\-\{19\} powders have been synthesized by mechanical milling and subsequent hear treatment.The effects of Pr 3+ doping concentration and annealing condition on the microstructure and magnetic properties have been systematically investigated.It is found that the Pr 3+ doping results in the increase of the temperature for the formation of hard magnetic compounds.The Curie temperature of Pr\- x Sr 1-x Fe\-\{12\}O\-\{19\} samples keeps constant with the variation of composition of the sample;however,it decreases slightly with the increase of annealing temperature.The addition of a small amount of Pr 3+ in the samples is beneficial to the improvement of coercivity,but accompanying with the deterioration of magnetization.The effect of annealing temperature on magnetic properties is different for the samples with different compositions.

关 键 词：矫顽力 镨离子 退火温度 居里温度 剩余磁化强度 内禀磁性 国家重点实验室 离子掺杂 机械球磨 永磁材料 

分 类 号：TM27[一般工业技术—材料科学与工程]