Electromagnetic and microwave absorbing properties of W-type barium ferrite doped with Gd3+
来源期刊：Rare Metals2011年第1期
论文作者：HUANG Xiaogua,CHEN Jiaoa,WANG Lixia,and ZHANG Qitua,b a College of Materials Science and Engineering,Nanjing University of Technology,Nanjing ,China b Jiangsu Provincial Key Laboratory of Inorganic and Composite New Materials,Nanjing University of Technology,Nanjing ,China
文章页码：44 - 48
摘 要：W-type barium ferrites doped with Gd3+,Ba1-xGdx（Zn0.3Co0.7）2Fe16O27（x = 0,0.05,0.10,0.15,0.20）,were prepared by a sol-gel method.The effects of Gd3+ substitution on their microstructure,electromagnetic properties and microwave absorptive behavior were analyzed.The XRD patterns showed the single phase of W-type barium ferrite when x ≤ 0.15.Microwave electromagnetic properties of samples were studied at the frequency range from 2 GHz to 18 GHz using a network analyzer（Agilent 8722ET）.The complex permittivity ε（ε’,ε’’） increased gradually when x ≤ 0.10,but it decreased as x = 0.15.The real permeability（μ’） decreased with the increase of Gd3+ content,while the imaginary permeability（μ’’） increased when x ≤ 0.10.All these reasons were discussed using the electromagnetic theory.Furthermore,the ferrite-epoxy compound coating materials with 80 wt.% of Ba0.9Gd0.1（Zn0.3Co0.7）2Fe16O27 were prepared to measure the microwave absorbing properties.The maximum of reflection loss（RL） reached about-27 dB and RL was below-10 dB in the frequency range of 8-18 GHz when the thickness was 1.92 mm.
HUANG Xiaogua,CHEN Jiaoa,WANG Lixia,and ZHANG Qitua,b a College of Materials Science and Engineering,Nanjing University of Technology,Nanjing 210009,China b Jiangsu Provincial Key Laboratory of Inorganic and Composite New Materials,Nanjing University of Technology,Nanjing 210009,China
摘 要：W-type barium ferrites doped with Gd3+,Ba1-xGdx（Zn0.3Co0.7）2Fe16O27（x = 0,0.05,0.10,0.15,0.20）,were prepared by a sol-gel method.The effects of Gd3+ substitution on their microstructure,electromagnetic properties and microwave absorptive behavior were analyzed.The XRD patterns showed the single phase of W-type barium ferrite when x ≤ 0.15.Microwave electromagnetic properties of samples were studied at the frequency range from 2 GHz to 18 GHz using a network analyzer（Agilent 8722ET）.The complex permittivity ε（ε’,ε’’） increased gradually when x ≤ 0.10,but it decreased as x = 0.15.The real permeability（μ’） decreased with the increase of Gd3+ content,while the imaginary permeability（μ’’） increased when x ≤ 0.10.All these reasons were discussed using the electromagnetic theory.Furthermore,the ferrite-epoxy compound coating materials with 80 wt.% of Ba0.9Gd0.1（Zn0.3Co0.7）2Fe16O27 were prepared to measure the microwave absorbing properties.The maximum of reflection loss（RL） reached about-27 dB and RL was below-10 dB in the frequency range of 8-18 GHz when the thickness was 1.92 mm.
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