Sb/Bi비에 따른 5원계 바리스터의 소결거동 및 전기적 특성(II) : ZnO-Bi2O3-Sb2O3-Co3O4-Cr2O3

홍연우; 이영진; 김세기; 김진호; Youn-Woo Hong; Young-Jin Lee; Sei-Ki Kim; Jin-Ho Kim

Korean Journal of Materials Research, Vol.22, No.12, 682-688, December, 2012

DOI10.3740/MRSK.2012.22.12.682 Export Citation

Sb/Bi비에 따른 5원계 바리스터의 소결거동 및 전기적 특성(II) : ZnO-Bi2O3-Sb2O3-Co3O4-Cr2O3

Sintering and Electrical Properties According to Sb/Bi Ratio(II) : ZnO-Bi2O3-Sb2O3-Co3O4-Cr2O3 Varistor

홍연우^†, 이영진, 김세기, 김진호¹

한국세라믹기술원 전자소재융합본부
¹경북대학교 신소재공학부

Youn-Woo Hong^†, Young-Jin Lee, Sei-Ki Kim, and Jin-Ho Kim¹

Electronic Materials Convergence Division, KICET, Seoul 153-801, Korea
¹School of Materials Science and Engineering, Kyungpook National University, Daegu 702-701, Korea

E-mail:

In this study we aimed to examine the co-doping effects of 1/6 mol% Co3O4 and 1/4 mol% Cr2O3 (Co:Cr = 1:1) on the reaction, microstructure, and electrical properties, such as the bulk defects and the grain boundary properties, of ZnOBi2O3- Sb2O3 (ZBS; Sb/Bi = 0.5, 1.0, and 2.0) varistors. The sintering and electrical properties of Co,Cr-doped ZBS, ZBS(CoCr) varistors were controlled using the Sb/Bi ratio. Pyrochlore (Zn2Bi3Sb3O14), α-spinel (Zn7Sb2O12), and δ-Bi2O3 were formed in all systems. Pyrochlore was decomposed and promoted densification at lower temperature on heating in Sb/Bi = 1.0 by Cr rather than Co. A more homogeneous microstructure was obtained in all systems affected by α-spinel. In ZBS(CoCr), the varistor characteristics were improved (non-linear coefficient, α = 20~63), and seemed to form Zni..(0.20 eV) and Vo .(0.33 eV) as dominant defects. From impedance and modulus spectroscopy, the grain boundaries were found to be composed of an electrically single barrier (0.94~1.1 eV) that is, however, somewhat sensitive to ambient oxygen with temperature. The phase development, densification, and microstructure were controlled by Cr rather than by Co but the electrical and grain boundary properties were controlled by Co rather than by Cr.

Keywords:ZnO varistor;electrical properties;Co3O4;Cr2O3;sintering

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[6] Kim J, Kimura T, Yamaguchi T, J. Am. Ceram. Soc., 72, 1390 (1989)

[7] Hong YW, Kim JH, J. Kor. Ceram. Soc., 37, 651 (2000)

[8] Hong YW, Shin HS, Yeo DH, Kim JH, Kim JH, J. KIEEME, 21, 738 (2008)

[9] Karanovic L , Poleti D, Vasovic D, Mater. Lett., 18, 191 (1994)

[10] Mergen A, Lee WE, J. Eur. Ceram. Soc., 17, 1049 (1997)

[11] Brankovic Z, Brankovic G, Poleti D, Varela JA, Ceram. Int., 247, 115 (2001)

[12] Philipp HR, Materials Science Research: Tailoring Multiphase and Composite Ceramics, Vol. 20, p. 481, edited by Tressler RE, Messing GL, Pantano CG, Prenum Press, London, UK (1987). (1987)

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[14] Hong YW, Shin HS, Yeo DH, Kim JH, J. KIEEME, 23, 942 (2010)

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[24] Nakano Y, Ichinose N, J. Mater. Res., 5, 2910 (1990)