Cu^(2+)和Mn^(2+)取代对低温烧结NiZn铁氧体材料微波电磁性能的影响  

The effect of substitutions of Cu^(2+)and Mn^(2+)ions on the microwave properties of low-temperature sintered NiZn ferrite materials

作　　者：袁红兰 冯涛 罗建成 彭梓 肖永成 YUAN Hong-lan;FENG Tao;LUO Jian-cheng;PENG Zhi;XIAO Yong-cheng(Ninth Institute,China Electronics Technology Corporation,Mianyang 621000,China)

机构地区：[1]中国电子科技集团公司第九研究所,四川绵阳621000

出　　处：《磁性材料及器件》2023年第2期6-10,共5页Journal of Magnetic Materials and Devices

摘　　要：采用普通陶瓷工艺制备了低温烧结微波多晶尖晶石NiZn铁氧体粉料,分别采用干压成型工艺和流延成型工艺制备了铁氧体样品。研究了Cu^(2+)、Mn^(2+)取代对材料微观形貌、微波性能的影响。研究表明,Cu^(2+)取代促进NiZn铁氧体晶粒生长,当Cu^(2+)取代量x在0.22~0.25范围时,样品致密化程度较高,材料有较低的电磁损耗。Cu^(2+)取代量x=0.22时,在880~920℃烧结温度下均获得单一的尖晶石NiZn结构;烧结温度为900℃时,材料具有高的饱和磁化强度4πM_(s)、低的气孔率P,介电损耗角正切tanδ_(ε)、铁磁共振线宽ΔH最小。Mn^(2+)取代使材料的铁磁共振线宽ΔH降低,但tanδ_(ε)增大,Mn^(2+)取代量控制在0.04~0.06范围,材料的综合性能较好。干压成型和流延成型制备的材料均具有比较小的电磁损耗,ΔH小于130 Oe,tanδ_(ε)小于5×10^(-4),满足LTCF技术应用要求。Low temperature sintered microwave polycrystalline spinel NiZn ferrite powder was prepared by common ceramic process,and ferrite samples were prepared by dry pressing process and flow casting process respectively.The effects of substitutions of Cu^(2+)and Mn^(2+)ions on micromorphology and microwave properties of low-temperature sintered NiZn ferrite materials were studied.The results show that the substitution of Cu^(2+)ion promotes the growth of NiZn ferrite grains.When the substitution amount x of Cu^(2+)ion is in the range of 0.22-0.25,the densification degree of NiZn ferrite is the highest,and the material has low electromagnetic loss.When Cu^(2+)ion substitution x=0.22,a single spinel NiZn structure is obtained at the sintering temperature of 880-920℃.When the sintering temperature is 900℃,the material has high saturation magnetization 4πM_(s),low porosity P,dielectric loss tanδ_(ε)and ferromagnetic resonance linewidthΔH.Mn^(2+)ion substitution reduces the ferromagnetic resonance linewidthΔH of the material,but increases the dielectric loss tanδ_(ε).When Mn^(2+)ion substitution is controlled in the range of 0-0.06,the comprehensive properties of the material are better.The properties of the materials prepared by dry pressing and flow casting were compared,both of them have relatively small electromagnetic losses,ΔH is less than 130 Oe and tanδ_(ε)is less than 5×10^(-4),which meets the requirements of LTCF technology application.

关 键 词：尖晶石铁氧体 低温烧结 取代 铁磁共振线宽 介电损耗 

分 类 号：TM271.2[一般工业技术—材料科学与工程]