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Effect of SnO2 and ZrO2 Co-doping on Magnetic and Electrical Properties of MnZn Ferrite with Fe-poor Composition

Author: ZhangShunLi
Tutor: WangYinGang
School: Nanjing University of Aeronautics and Astronautics
Course: Materials Processing Engineering
Keywords: MnZn power ferrite Curie temperature Resistivity Saturation magnetic induction Initial permeability Than the loss factor
CLC: TM277
Type: Master's thesis
Year: 2009
Downloads: 25
Quote: 0
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Abstract


MnZn ferrite materials is one of the basic materials of modern electronics industry and information industry. With the rapid development of communication technology, electronic technology and computer technology, MnZn power ferrite toward the development of high-frequency, low-loss direction. This paper first introduces MnZn power ferrite Research ferrite crystal structure and magnetic properties of the source MnZn ferrite formation of the solid-state reaction process and reduce the loss of MnZn ferrite and ferrite Basic electromagnetic parameters. The MnZn ferrite oxide ceramics prepared this article, formulations with low loss MnZn Power Ferrite doping, sintering temperature and performance. The poor iron formulations experimental material lean iron formulations showed high resistivity Fe 2 O 3 48mol%, the resistivity of the material to achieve more High 19.3Ω · m. This is mainly because the lean iron formula to reduce the iron content, thereby reducing the Fe3 and Fe 2 among the electronic transition, increasing the resistivity of the material, reducing the eddy current loss of the material. SnO 2 and ZrO 2 composite doping experiments found that adding the right amount of the trace additives can effectively reduce the magnetic loss power ferrite materials, because: zr 4 ferrite large concentration of ions in the ferrite grain boundaries, high resistivity of the grain boundary is formed in the grain boundary insulating layer, increase the resistivity of the ferrite, thereby reducing eddy currents loss; Sn 4 ions dissolved in the spinel lattice formation stable Fe 2 -Sn Fe 2 ion < sup> 4 -electron pairs, and does not participate in the exchange of electrons, thereby increasing the resistivity of the ferrite grain interior; the Sn 4 ions also with CA 2 , Si 4 the ion together form a grain boundary layer having a high resistivity, the resistivity of the ferrite grain boundary and reduce the eddy current loss of the ferrite. Composite doping can significantly improve the electrical and magnetic properties of the material, when ζ (SnO 2 : ZrO 2 ) 3:1 optimal performance. Experimental study found that by sintering temperature, the ferrite sintered at 1280 ° C sintering temperature, the resistivity of the material reached 29.5Ω · m, than the loss factor reduced to 4.8 × 10 -6 , the ranking of the sample inside temperature, saturation magnetic induction and initial magnetic permeability 455K, 553mT and 590 respectively.

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CLC: > Industrial Technology > Electrotechnical > Electrical materials > Magnetic materials,ferrite > Ferrite,oxide magnetic materials
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