Microwave electromagnetic and absorbing properties of Dy3+ doped MnZn ferrites
来源期刊：JOURNAL OF RARE EARTHS2010年第3期
论文作者：宋杰 王丽熙 许乃岑 张其土
文章页码：451 - 455
摘 要：Dy3+ doped Mn-Zn ferrites Mn0.3Zn0.7Fe2-xDyxO4（x=0,0.01,0.02,0.03,0.04）were prepared by the conventional solid-state reaction.The crystal structure,surface morphology and electromagnetic properties of the calcined samples were characterized by X-ray diffraction analysis（XRD）,scanning electron microscopy（SEM） and network analyzer（Agilent 8722ET）.All the XRD patterns showed the single phase of the spinel-type ferrite without other intermediate when x≤0.03.The average crystallite size was about 44?56 nm.The microwave electromagnetic properties of the samples were studied at the frequency range from 2 GHz to 18 GHz.It was shown that small amounts of Dy3+ substitution could adjust microwave electromagnetic parameters magically.The tan δ exhibited a maximal peak when x=0.03,and the peak value was 0.56.It indicated that the microwave electromagnetic loss properties were excellent when x=0.03.Furthermore,the reasons were also discussed using electromagnetic theory.The reflection loss（RL） increased with the Dy3+ content when x<0.04.The Mn0.3Zn0.7Fe1.97Dy0.03O4 ferrite displayed excellent microwave absorption properties.The frequency（with respect to-10 dB） started from 11.9 GHz,and the bandwidth reached about 3.5 GHz.The peak value of RL was about-20.5 dB at a matching thickness of 2.7 mm.
宋杰1，王丽熙1，许乃岑1，张其土1,2
1. College of Materials Science and Engineering,Nanjing University of Technology2. Jiangsu Provincial Key Laboratory of New Materials of Inorganic and its Composites,Nanjing University of Technology
摘 要：Dy3+ doped Mn-Zn ferrites Mn0.3Zn0.7Fe2-xDyxO4（x=0,0.01,0.02,0.03,0.04）were prepared by the conventional solid-state reaction.The crystal structure,surface morphology and electromagnetic properties of the calcined samples were characterized by X-ray diffraction analysis（XRD）,scanning electron microscopy（SEM） and network analyzer（Agilent 8722ET）.All the XRD patterns showed the single phase of the spinel-type ferrite without other intermediate when x≤0.03.The average crystallite size was about 44?56 nm.The microwave electromagnetic properties of the samples were studied at the frequency range from 2 GHz to 18 GHz.It was shown that small amounts of Dy3+ substitution could adjust microwave electromagnetic parameters magically.The tan δ exhibited a maximal peak when x=0.03,and the peak value was 0.56.It indicated that the microwave electromagnetic loss properties were excellent when x=0.03.Furthermore,the reasons were also discussed using electromagnetic theory.The reflection loss（RL） increased with the Dy3+ content when x<0.04.The Mn0.3Zn0.7Fe1.97Dy0.03O4 ferrite displayed excellent microwave absorption properties.The frequency（with respect to-10 dB） started from 11.9 GHz,and the bandwidth reached about 3.5 GHz.The peak value of RL was about-20.5 dB at a matching thickness of 2.7 mm.
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