简介概要

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

来源期刊:Rare Metals2017年第9期

论文作者:Jun-Liang Liu Peng Zhang Xing-Kai Zhang Qing-Qing Xie Dong-Jun Pan Jian Zhang Ming Zhang

文章页码:704 - 710

摘    要:La-doped Sr-hexaferrite(Sr1-xLaxFe12O19)(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 Sr2+ by La3+ results in the suppression effects on the growth-up of the crystallites and the enhancement of the electron hopping between Fe3+ 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.

详情信息展示

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

Jun-Liang Liu,Peng Zhang,Xing-Kai Zhang,Qing-Qing Xie,Dong-Jun Pan,Jian Zhang,Ming Zhang

School of Chemistry and Chemical Engineering, Yangzhou University

摘 要:La-doped Sr-hexaferrite(Sr1-xLaxFe12O19)(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 Sr2+ by La3+ results in the suppression effects on the growth-up of the crystallites and the enhancement of the electron hopping between Fe3+ 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.

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