Effects of sintering temperature on microstructure and magnetic properties of NiCuZn ferrites for NFC application
Permeability and Q-factor are important factors for the near-field communication(NFC)techniques.To obtain great performance at high frequency(~13.56 MHz),Ni0.368Cu0.2Zn0.432Fe2O3 ferrite ceramics doped with Co2O3 were synthesized by the solid-state reaction method.XRD shows a pure spinel phase of NiCuZn ferrite ceramic can be formed without other phase while a sintering temperature varying from 1000 ℃ to 1100 ℃.Results indicate that an optimal volume of Co2O3 additive suppresses grain growth and lead to the formation of compact NiCuZn ferrite ceramics(the average grain size < 1 μm).We also find that grain size increase with enhancement of sintering temperatures.Meanwhile,fine dense grains of NiCuZn ferrite ceramics and relatively low sintering temperature are obviously enhancing Q-factor and improving permeability at 13.56 MHz.Finally,a Co2O3 substituted NiCuZn ferrite ceramics(x=0.2)with good permeability(~118 @13.56 MHz)and highly Q-factor(~50 @13.56 MHz)were obtained at the optimal sintering temperature~1025 ℃.The results reveal that the synthesized ferrite ceramics is an excellent material to be used in NFC systems.
NiCuZn ferrite ceramics high frequency Co2O3 NFC system
Yan Yang Huaiwu Zhang Jie Li
State Key Laboratory of Electronic Thin Film and Integrated Devices,University of Electronic Science State Key Laboratory of Electronic Thin Film and Integrated Devices,University of Electronic Science
国际会议
上海
英文
928-932
2018-08-08（万方平台首次上网日期，不代表论文的发表时间）