镨离子掺杂对SrFe12O19结构和磁性的影响

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Pr_1-xSr_xFe₁₂O₁₉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. 关键词：

Effect of Pr3+ Doping Concentration on the Structure and Magnetic Properties of SrFe12O19 Compounds

The isotropic Pr-doped SrFe₁₂O₁₉ powders have been synthesized by mechanical milling and subsequent hear treatment. The effects of Pr³⁺ doping concentration and annealing condition on the microstructure and magnetic properties have been systematically investigated. It is found that the Pr³⁺ doping results in the increase of the temperature for the formation of hard magnetic compounds. The Curie temperature of Pr_xSr_1-xFe₁₂O₁₉ 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 Pr³⁺ 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.