锶铁氧体矫顽力和剩磁增强的机理分析(英文)  

Mechanism analyses of coercivity and remanence enhancement in strontium ferrites

作　　者：昝芬莲[1] 马永青[1] 张贤[1] 马倩[1] 郑赣鸿[1] 戴振翔[1] 

机构地区：[1]安徽大学物理与材料科学学院,安徽省信息材料与器件重点实验室,安徽合肥230039

出　　处：《安徽大学学报（自然科学版）》2014年第2期45-54,共10页Journal of Anhui University(Natural Science Edition)

基　　金：Supported by the National Natural Science Foundation of China(11174004,50901074);Higher Educational Natural Science Foundation of Anhui Province(KJ2010A012);the"211 Project"of Anhui University

摘　　要：通过改变前驱体溶液中Fe3+/Sr2+的摩尔比和烧结温度,用共沉淀法合成锶铁氧体的纳米晶体.由于应力各向异性的减弱,随着烧结温度的增加,单相和复合相的SrFe12O19纳米粒子样品的矫顽力均减小.对于前驱体溶液中不同Fe3+/Sr2+摩尔比形成的单相SrFe12O19,矫顽力的大小主要由Fe3+空位和反磁化核决定.单相SrFe12O19纳米粒子间交换相互作用和硬磁的SrFe12O19与软磁的γ-Fe2O3之间的交换弹簧作用,可导致剩磁增强.Nanocrystalline strontium ferrites were synthesized by co-precipitation method with the different Fe3＋/Sr2＋ mole ratio in the precursor solution and calcinated at different temperatures.With increasing calcination temperature,the coercivity decreased for both single-phase and composite SrFe12O19 samples which can be assigned to the weakened stress anisotropy.For the single-phase SrFe12O19 samples with different Fe3＋/Sr2＋ mole ratios in the precursor solution,the coercivity was mainly determined by Fe3＋ vacancies and nuclei of reversed domain.The remanence enhancement was also observed,which can be attributed to the intergrain exchange interactions for single phase SrFe12O19 and to the exchange-spring for the composite of hard SrFe12O19 and soft γ-Fe2O3.

关 键 词：M型锶铁氧体 矫顽力机理 交换耦合相互作用 

分 类 号：TM271[一般工业技术—材料科学与工程]