Journal of the Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회논문지)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
권호 표지
DOI QR코드

DOI QR Code

Sintering and Electrical Properties of Cr-doped ZnO-Bi2O3-Sb2O3

Cr을 첨가한 ZnO-Bi2O3-Sb2O3계의 소결과 전기적 특성

  • Hong, Youn-Woo (Bio-IT Convergence Center, Korea Institute of Ceramic Engineering and Technology) ;
  • Shin, Hyo-Soon (Bio-IT Convergence Center, Korea Institute of Ceramic Engineering and Technology) ;
  • Yeo, Dong-Hun (Bio-IT Convergence Center, Korea Institute of Ceramic Engineering and Technology) ;
  • Kim, Jin-Ho (School of Materials Science and Engineering, Kyungpook National University)
  • 홍연우 (한국세라믹기술원 바이오IT융합센터) ;
  • 신효순 (한국세라믹기술원 바이오IT융합센터) ;
  • 여동훈 (한국세라믹기술원 바이오IT융합센터) ;
  • 김진호 (경북대학교 신소재공학부)
  • Received : 2010.09.15
  • Accepted : 2010.11.09
  • Published : 2010.12.01
Download PDF
⟨ Previous Next ⟩

Abstract

In this study we aims to examine the effects of 0.5 mol% $Cr_2O_3$ addition on the reaction, microstructure development, resultant electrical properties, and especially the bulk trap and interface state levels of ZnO-$Bi_2O_3-Sb_2O_3$ (Sb/Bi=0.5, 1.0, and 2.0) systems (ZBS). The samples were prepared by conventional ceramic process, and characterized by XRD, density, SEM, I-V, impedance and modulus spectroscopy (IS & MS) measurement. The sintering and electrical properties of Cr-doped ZBS (ZBSCr) systems were controlled by Sb/Bi ratio. Pyrochlore ($Zn_2Bi_3Sb_3O_{14}$) was decomposed more than $100^{\circ}C$ lowered on heating in ZBS (Sb/Bi=1.0) by Cr doping. The densification of ZBSCr (Sb/Bi=0.5) system was retarded to $800^{\circ}C$ by unknown Bi-rich phase produced at $700^{\circ}C$. Pyrochlore on cooling was reproduced in all systems. And $Zn_7Sb_2O_{12}$ spinel ($\alpha$-polymorph) and $\delta-Bi_2O_3$ phase were formed by Cr doping. In ZBSCr, the varistor characteristics were not improved drastically (non-linear coefficient $\alpha$ = 7~12) and independent on microstructure according to Sb/Bi ratio. Doping of $Cr_2O_3$ to ZBS seemed to form $Zn_i^{..}$(0.16 eV) and $V^{\bullet}_o$ (0.33 eV) as dominant defects. From IS & MS, especially the grain boundaries of Sb/Bi=0.5 systems were divided into two types, i.e. sensitive to oxygen and thus electrically active one (1.1 eV) and electrically inactive intergranular one (0.95 eV) with temperature.

Keywords

References

  1. D. R. Clarke, J. Am. Ceram. Soc. 82, 485 (1999). https://doi.org/10.1111/j.1151-2916.1999.tb01793.x
  2. L. M. Levinson and H. R. Philipp, Am. Ceram. Soc. Bull. 65, 639 (1986).
  3. R. Einzinger, Ann. Rev. Mater. Sci. 17, 299 (1987). https://doi.org/10.1146/annurev.ms.17.080187.001503
  4. M. Inada and M. Matsuoka, Advances in Ceramics, Vol. 7 (Am. Ceram. Soc., Columbus, OH, 1983) p. 91.
  5. J. Kim, T. K. Kimura, and T. Yamaguchi, J. Am. Ceram. Soc. 72, 1390 (1989). https://doi.org/10.1111/j.1151-2916.1989.tb07659.x
  6. Y. W. Hong and J. H. Kim, J. Kor. Ceram. Soc. 37, 651 (2000).
  7. Y.-W. Hong, H.-S. Shin, D.-H. Yeo, J.-H. Kim, and J.-H. Kim, J. KIEEME 21, 738 (2008).
  8. Y.-W Hong, H.-S. Shin, D.-H. Yeo, J.-H. Kim, and J.-H. Kim, J. KIEEME 22, 941 (2009).
  9. J. Han, P. Q. Mantas, and A. M. R. Senos, J. Euro. Ceram. Soc. 22, 49 (2002). https://doi.org/10.1016/S0955-2219(01)00241-2
  10. M. Andres-Verges and A. R. West, J. Electroceram. 1, 125 (1997). https://doi.org/10.1023/A:1009906315725
  11. Y.-W. Hong, H.-S. Shin, D.-H. Yeo, and J.-H. Kim, J. KIEEME 23, 368 (2010).
  12. H. Kanai and M. Imai, J. Mater. Sci. 23, 4379 (1988). https://doi.org/10.1007/BF00551935
  13. Y. W. Hong and J. H. Kim, Ceram. Int. 30, 1307 (2004). https://doi.org/10.1016/j.ceramint.2003.12.026