J. Korean Ceram. Soc. > Volume 32(9); 1995 > Article
 Journal of the Korean Ceramic Society 1995;32(9): 1033.
 $SiO_2$와 CaO 첨가가 Mn-Zn Ferrites의 전자기적 물성에 미치는 영향 서정주, 신명승1, 한영호 성균관대학교 재료공학과1이수세라믹(주) Effect of CaO and $SiO_2$ Addition on the Electromagnetic Properties of Mn-Zn Ferrites ABSTRACT The current experiment has quantitatively investigated the effect of the content of CaO and SiO2 on the microstructure, density, electrical resistivity, power loss and initial permeability of manganese zinc ferrites. The density increased initially with CaO and SiO2 content and the further addition showed an adverse effect. The excess addition of CaO and SiO2 developed a discontinuous grain growth with numerous pores inside grains and lowered the electrical resistivity. The initial permeability decreased with increasing the content of SiO2. The samples with relatively low power loss showed that half of the total loss at 10$0^{circ}C$, 100 kHz and 2000 Gauss was due to the eddy current loss. Key words: Mn-Zn Ferrite, $SiO_2$, CaO, Power loss, Microstructure
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