Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference (한국전기전자재료학회:학술대회논문집)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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Analysis of a.c. Characteristics in $ZnO-Bi_2O_3-Cr_2O_3$ Varistor Using Dielectric Functions

유전함수를 이용한 $ZnO-Bi_2O_3-Cr_2O_3$ 바리스터의 a.c. 특성 분석

  • Hong, Youn-Woo (IT Convergence Lab., Future Convergence Ceramic Div., Korea Institute of Ceramic Eng. & Tech.) ;
  • Shin, Hyo-Soon (IT Convergence Lab., Future Convergence Ceramic Div., Korea Institute of Ceramic Eng. & Tech.) ;
  • Yeo, Dong-Hun (IT Convergence Lab., Future Convergence Ceramic Div., Korea Institute of Ceramic Eng. & Tech.) ;
  • Kim, Jong-Hee (IT Convergence Lab., Future Convergence Ceramic Div., Korea Institute of Ceramic Eng. & Tech.)
  • 홍연우 (한국세라믹기술원 미래융합세라믹본부 IT융합팀) ;
  • 신효순 (한국세라믹기술원 미래융합세라믹본부 IT융합팀) ;
  • 여동훈 (한국세라믹기술원 미래융합세라믹본부 IT융합팀) ;
  • 김종희 (한국세라믹기술원 미래융합세라믹본부 IT융합팀)
  • Published : 2009.11.12
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Abstract

In this study, we investigated the effects of Cr dopant on the bulk trap level and grain boundary characteristics of $Bi_2O_3$-based ZnO (ZB) using dielectric functions such as $Z^*$, $Y^*$, $M^*$, ${\varepsilon}^*$, and $tan{\delta}$. More than two bulk traps of $Zn_i$ and $V_o$ probably in different ionization states could be identified in ZBCr($ZnO-Bi_2O_3-Cr_2O_3$). The grain boundaries of ZBCr could be electrochemically divided into two types: sensitive to ambient oxygen and thus electrically active one and oxygen-insensitive and thus electrically inactive one.

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