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Influence of CaO and V_2O_5 on high frequency MnZn power ferrite

YU Zhong;LAN Zhongwen;WANG Jingmei College of Micro-Electronics and Solid-Electronics,University of Electronic Science and Technology of China, Chengdu 610054  
The high frequency MnZn power ferrite was prepared by the conventional oxide ceramic process.The more quantity of CaO Is needed to increase the grain boundary resistivity and suppress the eddy current loss of the high frequency MnZn power ferrite applied at frequencies higher than 500 kHz.An optimum concentration of V-2O-5 acting indirectly via liquid phase formation and influencing the microstructural development during sintering makes the crystalline grain be refined,the amount of grain boundary and grain boundary resistivity increase,the porosity decrease,and the power losses be suppressed.Adopting the complex additives containing 0.3,0.15 and 0.1%by weight of CaO. TiO_2 and V_2O_5,respectively,the MnZn power ferrite cores with initial permeability of about 1500, low power loss of about 130 mW·cm~(-3)(500 kHz,50 mT,25℃),grain diameter of 3~5 μm and low porosity can be prepared.
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