The Effect of $Tio_2$ Addition on the Magnetic Properties of Mn-Zn Ferrites

$Tio_2$첨가가 Mn-Zn Ferrites의 자기적 특성에 미치는 영향

  • 박종원 (성균관대학교 재료공학과) ;
  • 한영호 (성균관대학교 재료공학과)
  • Published : 1999.12.01

Abstract

The effect of TiO$_2$addition has been studied on the power loss, density, initial permeability, resistivity, and microstructure of Mn-Zn ferrites. TiO$_2$addition increased the density of sintered body and decreased of the initial permeability. Activation energy for electron hopping as well as electrical resistivity increased with TiO$_2$addition. The toroidal core sintered at 1150 $^{\circ}C$ with 1.5 wt% of TiO$_2$demonstrated the power loss of 83 mW/㎤ at 1 MHz, 25 mT, 8$0^{\circ}C$. However, the same specimen sintered at 120$0^{\circ}C$ lead to the power loss, 1168 mW/㎤ at 1 MHz, 25 mT, 8$0^{\circ}C$ and developed an exaggerated grain growth.

Mn-Zn ferrites에 TiO2가 첨가될 때 전력손실, 밀도, 초기투자율, 저항, 그리고 미세구조의 변화를 관찰하였다. 첨가량이 증가함에 따라 밀도는 증가했지만, 초기투자율은 감소하였다. TiO2의 첨가에 따라 electron hopping을 일으키는 활성화에너지와 전기저항이 증가하였다. 115$0^{\circ}C$에서 소결한 TiO2를 1.5 wt% 첨가한 시편은 1 MHz, 25 mT, 8$0^{\circ}C$에서 83 mW/㎤의 전력손실을 나타내었다. 그러나 120$0^{\circ}C$에서 소결할 때는 과대입성장이 발생하여 같은 측정 조건에서 1168 mW/㎤의 전략손실을 얻었다.

Keywords

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