ZrO_(2)-Nb_(2)O_(5)复合添加对MnZn铁氧体结构和磁性能的影响  

Effect of ZrO_(2) and Nb_(2)O_(5) co-doping on the structure and magnetic properties of MnZn ferrites for high-frequency application

作　　者：王钰琪 雷国莉[1] 颜冲[1] WANG Yuqi;LEI Guoli;YAN Chong(College of Materials and Chemistry,China Jiliang University,Hangzhou 310018,China)

机构地区：[1]中国计量大学材料与化学学院,浙江杭州310018

出　　处：《电子元件与材料》2023年第6期687-692,共6页Electronic Components And Materials

基　　金：国家自然科学基金(U1809216)。

摘　　要：针对开关电源高频小型化需求,采用固相反应制备分子式为(Mn_(0.766)Zn_(0.105)Fe_(0.129))Fe_(2)O_(4)的MnZn铁氧体材料,通过对铁氧体微结构的表征及磁性能的测试,研究了ZrO_(2)和Nb_(2)O_(5)复合添加对MnZn铁氧体显微结构、烧结密度d、初始磁导率μ_(i)、饱和磁通密度B_(s)、剩余磁通密度B_(r)、矫顽力H_(c)以及功耗P_(cv)特性的影响。结果表明,ZrO_(2)和Nb_(2)O_(5)复合添加有利于促进晶粒均匀化和致密化,从而提高了材料烧结密度,能显著降低材料的剩余磁通密度和矫顽力,实现材料的高起始磁导率以及高频低损耗。当ZrO_(2)和Nb_(2)O_(5)复合添加质量比为4∶6时,MnZn铁氧体的μi达到最大值(931),且在高频激励下材料的功率损耗达到最低133 kW/m^(3)(100℃,1000 kHz,50 mT)。Aiming at the miniaturization of the switching power supply for high-frequency applications,MnZn ferrite materials with the molecular formula of(Mn_(0.766)Zn_(0.105)Fe_(0.129))Fe_(2)O_(4) were prepared by the conventional solid-phase reaction method.The effects of co-doping ZrO_(2)-Nb2 O_(5) on the microstructure sintering density d,initial permeability μ_(i),saturation magnetic flux density B_(s),residual magnetic flux density B_(r),coercivity H_(c) and power loss P_(cv) of MnZn ferrites were investigated.The results indicate that the additives of co-doping ZrO_(2)-Nb_(2) O_(5) with appropriate amounts are beneficial to the uniformity promotion of the grain size and improvement of the sintering density of the materials.The residual magnetic flux density and coercivity are significantly reduced,and high initial permeability and low power loss at high-frequency are achieved.The initial permeability of 931 and power loss of 133 kW/m^(3)(100℃,1000 kHz,50 mT)are obtained at 4∶6 of co-doping mass ratio with ZrO_(2) and Nb_(2)O_(5) additivities.

关 键 词：MNZN铁氧体 ZrO_(2)-Nb_(2)O_(5)复合添加 微结构 起始磁导率 高频功率损耗 

分 类 号：TM277[一般工业技术—材料科学与工程]