Synthesis and microwave absorbing properties of La-doped Sr-hexaferrite nanopowders via sol-gel auto-combustion method  

作　　者：Jun-Liang Liu Peng Zhang Xing-Kai Zhang Qing-Qing Xie Dong-Jun Pan Jian Zhang Ming Zhang 

机构地区：[1]School of Chemistry and Chemical Engineering,Yangzhou University,Yangzhou 225002,China

出　　处：《Rare Metals》2017年第9期704-710,共7页稀有金属（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(No.51103125);the Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions(Chemistry);the Natural Science Foundation of Yangzhou(No.YZ2014043);the Science Innovative Foundation of Yangzhou University(No.2014CXJ017);the Graduate Student Innovation foundation of Yangzhou University(No.CXLX 1413)

摘　　要：La-doped Sr-hexaferrite（Sr（1-x）LaxFe（12）O（19））（x=0.05,0.10,0.15,0.20） nanopowders with particle size ranging from 80 to 110 nm were successfully synthesized by sol-gel auto-combustion. The phase formation temperature increases, while the particle size decreases as the Ladoping content goes up. The partial substitution of Sr^（2＋） by La^（3＋） results in the suppression effects on the growth-up of the crystallites and the enhancement of the electron hopping between Fe^（3＋） with different valences, which leads to the improvement in the dielectric loss and magnetic loss.Therefore, both the microwave absorbing abilities and absorbing frequency ranges are tuned by La-doping. The synthesized Sr-hexaferrite nanopowders with doping element content of 0.10 demonstrate the fine broad microwave absorbing properties.La-doped Sr-hexaferrite（Sr（1-x）LaxFe（12）O（19））（x=0.05,0.10,0.15,0.20） nanopowders with particle size ranging from 80 to 110 nm were successfully synthesized by sol-gel auto-combustion. The phase formation temperature increases, while the particle size decreases as the Ladoping content goes up. The partial substitution of Sr^（2＋） by La^（3＋） results in the suppression effects on the growth-up of the crystallites and the enhancement of the electron hopping between Fe^（3＋） with different valences, which leads to the improvement in the dielectric loss and magnetic loss.Therefore, both the microwave absorbing abilities and absorbing frequency ranges are tuned by La-doping. The synthesized Sr-hexaferrite nanopowders with doping element content of 0.10 demonstrate the fine broad microwave absorbing properties.

关 键 词：FERRITE La-doping NANOPOWDERS Sol-gelauto-combustion Microwave absorbing properties 

分 类 号：TB383.3[一般工业技术—材料科学与工程]