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溶胶-凝胶燃烧合成法制备Mg~(2+)掺杂Li-Zn铁氧体及其微波电磁性能

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Abstract:

采用溶胶-凝胶燃烧合成法制备Li0.1Zn0.8MgxFe2.1-xO4(x=0,0.01,0.03,0.05,0.07,摩尔分数)铁氧体粉末。通过热重-差示扫描量热仪、Fourier红外光谱仪(Fouriertransforminfraredspectroscopy,FTIR)、X射线衍射和扫描电镜分别表征样品的形成过程、晶体结构、微观形貌和粒径。结果表明当x≤0.05时,制得的粉体为纯度较高的尖晶石型Li-Zn铁氧体。随着Mg2+掺量的增加,晶格常数先增后减。适量Mg2+掺杂使FTIR谱带向低波数方向移动。使用Agilent8722ET网络分析仪在频率为2~18GHz分析样品的微波电磁性能,结果发现掺入适量Mg2+能有效调整铁氧体的微波电磁参数,当Mg2+掺量为0.05时,在7GHz和15GHz附近介电损耗峰值达到最大,分别为0.1和0.49,此时微波电磁损耗最佳。利用微波电磁理论分析电磁参数的变化机理。

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