Sc掺杂M型钡铁氧体烧结过程中的相变及磁性研究  

Phase Transition and Magnetic Properties in the Forming Process of Sc Doped M-Type Hexaferrite

作　　者：周浩 汤如俊 

机构地区：[1]苏州大学,物理与光电·能源学部,江苏省薄膜材料重点实验室,江苏苏州

出　　处：《应用物理》2016年第11期265-271,共7页Applied Physics

基　　金：国家自然科学基金(51202153,11274237)的支持;感谢教育部基金(20123201120028)。

摘　　要：本文采用固相反应法制备了掺杂M型钡铁氧体BaFe10.2Sc1.8O19,并对其在烧结过程中的相变及磁性质做了一定的研究。结果表明,当烧结温度低于1000℃时,尖晶石相BaFe2O4和铁离子缺失的M型铁氧体是主要的烧结产物。当烧结温度高于1050℃时,M型铁氧体BaFe10.2Sc1.8O19开始生成。直到当烧结温度达到1200℃时,BaFe10.2Sc1.8O19才以单相的形式存在于烧结产物中。随着烧结温度的升高,烧结产物的剩磁比和矫顽场逐步降低,并在烧结温度高于1200℃的时候降到接近于零。饱和磁化强度随着烧结温度的升高逐步升高,并在1050℃的时候达到最大值,随后逐渐降低。磁性质的变化过程与烧结产物的相变是一致的。以上结果表明,相对于Fe3+,Sc3+对M型铁氧体的掺杂需要更高的热能,并会导致M型铁氧体磁性质的较大变化。Sc doped M-type hexaferrite BaFe10.2Sc1.8O19 was prepared with the conventional solid state reaction method. The phase and magnetic property transition processes in the sintering process of M-type hexaferrite BaFe10.2Sc1.8O19 have been investigated. Results show that the spinel phase BaFe2O4 and ion-deficient M-type hexaferrite dominate when sintering temperature is lower than 1000?C. The M-type hexaferrite BaFe10.2Sc1.8O19 appears above 1050?C and does not become a single phase until 1200?C. Both the remanence ratio and coercivity of the samples decrease with increasing sintering temperature and drop to nearly zero above 1200?C. However, the saturation magnetization of the samples increases with increasing sintering temperature until 1050?C and then decreases. The magnetic property transition process agrees well with the phase transition process. The above results show that incorporation of Sc3+ into the M-type hexaferrite needs a higher thermal energy than that of Fe3+, and will lead to a drastic change in the magnetic properties of M-type hexaferrite.

关 键 词：M型铁氧体 Sc3+掺杂 烧结温度 相变 磁性质 

分 类 号：TM2[一般工业技术—材料科学与工程]