摘要
采用熔盐-共沉淀法制备了六方晶系M型铁氧体Ba（CoTi）1.2Fe9.5Mn0.15O19粉体。利用X-射线衍射分析（XRD）、差热-热重分析（DTA—TG）结合扫描电子显微镜（SEM）对Ba（CoTi）1.2Fe9.5Mn0.15O19粉体样品的晶化过程进行了研究。结果表明，当焙烧温度为650℃时．钡铁氧体已开始生成；当焙烧温度为850℃时，前驱体完全晶化为单相纳米级铁氧体晶粒，呈六角片状；当焙烧温度为1150℃时可得微米级铁氧体晶粒，其外形呈14面体，且在{0001}晶面上出现凹陷。利用矢量网络分析仪对样品的微波吸收性能进行了表征，结果表明，在8．2～12．4GHz频段内，晶粒外形为十四面体且在{0001}晶面上出现凹陷的微米级粒子比纳米级片状粒子的磁损耗特性好，介电损耗特性差。
M-type ferrite Ba（CoTi）1.2 Fe9.5 Mn0.15 O19 powders were prepared by coprecipitation-fused-salt. X-ray diffraction（XRD）, thermal analysis and scan electron microscope（SEM） were used to study the detailed information on the crystallization process of the barium ferrite. It was found that barium ferrite came into being at 650 ℃ and the precursor had been completely crystaled into the single phase Ba-ferrite at 850 ℃ ; the ferrite nanopaticles obtained at 850 ℃ had a well developed morphology with a hexagonal-like appearance and were well separated from one another; the ferrite microcrystals obtained at 1 150℃ possessed a fourteen-surface body with sag on their crystal faces {0001}. Vector network analyzer was used to analyze microwave absorption performance. The results showed that the micron particles with fourteen surfaces and sag on their crystal faces {0001} were better than nanoparticles with hexagonal shape in magnetic loss, but worse in dielectric loss.
出处
《压电与声光》
CSCD
北大核心
2008年第3期346-348,362,共4页
Piezoelectrics & Acoustooptics
基金
陕西省自然科学基金资助项目(D70103050130)
关键词
熔盐-共沉淀法
M型钡铁氧体
微波吸收特性
coprecipitation-fused-salt method
M-type barium ferrite
microwave absorption properties
