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REVISIT TO DIELECTRIC PROPERTIES OF ferrite ceramics

Journal of Advanced Dielectrics 2012年第3期2卷 6-18页

作者： L.B.KONG L.LIU J.W.ZHAI Z.W.LI Z.H.YANG School of Materials Science and Engineering Nanyang Technological University 50 Nanyang Avenue Singapore 639798 Temasek Laboratories National University of Singapore 5A Engineering Drive 1Singapore 117411 Functional Materials Research Laboratory Tongji University Shanghai 200092 China

Dielectric properties offerrite ceramics have been less reported than their magnetic *** study indicated that ferrite ceramics with very low dielectric loss tangent can be developed byusing appropriate sintering aids,together with the optimization of other sintering parameters suchas sintering temperature and time *** various candidates of sintering aids,Bi_(2)O_(3)isthe most promising *** is important to find that the optimized concentration of sintering aid forfull densification is not sufficient to achieve lowest dielectric loss *** short review was aimed to summarize the understanding in microstructural evolution,grain growth,densificationand dielectric properties offerrite ceramics as a function of sintering aid concentration and sinteringparameters,which could be used as a guidance to develop ferrite ceramics with low dielectric losstangents for various applications.

关键词： ferrite ceramics DC resistivity complex permittivity dielectric loss tangent densi-¯cation microstructure grain growth

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Optimization of Ni_(0.95-x)Zn_(x)Co_(0.05)Fe_(1.90)Mn_(0.02)O_(4) ceramics with promising magneto-dielectric properties for VHF antenna miniaturization

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Journal of Advanced Dielectrics 2018年第1期8卷 11-16页

作者： Zhuohao Xiao Chuanhu Wang Lie Liu Zhihong Yang Ling Bing Kong School of Materials Science and Engineering Jingdezhen Ceramic Institute Jingdezhen 333001JiangxiP.R.China School of Materials Science and Engineering Nanyang Technological University 50 Nanyang AvenueSingapore 639798 Department of Material and Chemical Engineering Bengbu University Bengbu 233030Anhui P.R.China General Test Systems Inc. Shenzhen 518102GuangdongP.R.China College of Materials Science and Technology Nanjing University of Aeronautics and Astronautics Nanjing 211100 P.R.China

Magnetic,dielectric and DC conductive properties of Ni_(0.95-x)Zn_(x)Co_(0.05)Fe_(1.90)Mn_(0.02)O_(4)(with x=0-0.20 at an interval of 0.05)ferrite ceramics were studied,in order to develop magneto-dielectric materials with almost equal values of relative permeability and permittivity,for the miniaturization of HF(3-30 MHz)and VHF(30-90MHz and 100-300 MHz)*** ferrite ceramics were prepared by using the conventional two-step sintering *** real part of relative permeability is increased almost linearly with increasing concentration of Zn,while that of relative permittivity keeps nearly *** is found that promising magneto-dielectric materials,with close values of real permeability and permittivity over 30-90 MHz(VHF),can be obtained for the samples at Zn concentrations between x=0.05 and x=0.10.

关键词： Magneto-dielectric materials complex permittivity complex permeability antenna miniaturization ferrite ceramics

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