Browse > Article
http://dx.doi.org/10.4313/TEEM.2012.13.5.262

Microstructure and Electrical Properties of ZPCCYT Varistor Ceramics  

Nahm, Choon-Woo (Department of Electrical Engineering, Dongeui University)
Lee, Sun-Kwon (Department of Electrical Engineering, Dongeui University)
Publication Information
Transactions on Electrical and Electronic Materials / v.13, no.5, 2012 , pp. 262-265 More about this Journal
Abstract
The Microstructure and nonlinear electrical properties of the ZPCCYT (ZnO-$Pr_6O_{11}$-CoO-$Cr_2O_3$-$Y_2O_3$-$Tb_4O_7$) varistors were investigated for different amounts of $Tb_4O_7$. The addition of $Tb_4O_7$ has a significant effect on microstructure and electrical properties. Analysis of the microstructure indicated that the ceramics consisted of ZnO grain as a main phase and a few secondary phases as a mix of $Pr_6O_{11}$, $Y_2O_3$, and $Tb_4O_7$. As the amount of $Tb_4O_7$ increased, the sintered densities of pellets increased from $\rho$ = 5.70 to $5.78g/cm^3$ and the average grain size decreased from d = 4.8 to $3.6{\mu}m$. The increase in the amount of $Tb_4O_7$ increased from $E_B$ = 7,473 to 10,035 V/cm and from ${\alpha}$ = 39.7 to 52.2. In particular, it was found that the ceramics modified with 1.0 mol% in the amount of $Tb_4O_7$ are suited for the varistors for high voltage in the light of a high sintered density and a high voltage gradient.
Keywords
$Tb_4O_7$; ZnO-$Pr_6O_{11}$-Based ceramics; Breakdown field; Varistors;
Citations & Related Records
연도 인용수 순위
  • Reference
1 L. M. Levinson and H. R. Philipp, Am. Ceram. Soc. Bull. 65, 639 (1986).
2 T. K.Gupta, J. Am. Ceram. Soc. 73, 1817 (1990) [DOI:http:// dx.doi.org/10.1111/j.1151-2916.1990.tb05232.x].   DOI
3 K. Mukae, Am. Ceram. Bull. 66, 1329 (1987).
4 K. Mukae, K. Tsuda, and S. Shiga, IEEE Tran. Pow. Deliv. 3, 591 (1988) [DOI: http://dx.doi.org/10.1109/61.4296].   DOI   ScienceOn
5 H. K. Varma, K. P. Kumar, K. G. K. Warrier, and A. D. Damodaran, J. Mater. Sci. Lett. 8, 974 (1989) [DOI: http://dx.doi.org/10.1007/BF01729966].   DOI
6 A. B. Alles and V. L. Burdick, J. Appl. Phys. 70, 6883 (1991) [DOI: http://dx.doi.org/10.1063/1.349812].   DOI
7 A. B. Alles, R. Puskas, G. Callahan, and V. L. Burdick, J. Am. Ceram. Soc. 76, 2098 (1993) [DOI: http://dx.doi.org/10.1111/j.1151-2916.1993.tb08339.x].   DOI   ScienceOn
8 Y.-S. Lee, K.-S. Liao, and T.-Y. Tseng, J. Am. Ceram. Soc. 79, 2379 (1996) [DOI: http://dx.doi.org/10.1111/j.1151-2916.1996.tb08986.x].   DOI   ScienceOn
9 H. H. Hng and K. M. Knowles, J. Mater. Sci. 37, 143 (2002) [DOI:http://dx.doi.org/10.1023/A:1014359204034].   DOI   ScienceOn
10 H. Heng, X. Fu, Z. Fu, C. Wang, L. Qi, and H. Miao, J. Alloy. Compd. 497, 304 (2010) [DOI: http://dx.doi.org/10.1016/j.jallcom.2010.03.047].   DOI   ScienceOn
11 Z. Peng, X. Fu, Y. Zang, Z. Fu, C. Wang, L. Qi, and H. Miao, J. Alloy. Compd. 508, 494 (2010) [DOI: http://dx.doi.org/10.1016/j.jallcom.2010.08.100].   DOI   ScienceOn
12 C.-W. Nahm, Mater. Lett. 47, 182 (2001) [DOI: http://dx.doi. org/10.1016/S0167-577X(00)00262-7].   DOI   ScienceOn
13 C.-W. Nahm and J.-S. Ryu, Mater. Lett. 53, 110 (2002) [DOI:http://dx.doi.org/10.1016/S0167-577X(01)00464-5].   DOI   ScienceOn
14 C.-W. Nahm, B.-C. Shin, and B.-H. Min, Mater. Chem. Phys. 82, 157 (2003) [DOI: http://dx.doi.org/10.1016/S0254-0584(03)00213-X].   DOI   ScienceOn
15 C.-W. Nahm, J.-A. Park, B.-C. Shin, and I.-S. Kim, Ceram. Int. 30, 1009 (2004) [DOI: http://dx.doi.org/10.1016/j.ceramint.2003.10.020   DOI   ScienceOn
16 C.-W. Nahm, Mater. Lett. 60, 3311(2006) [DOI: http://dx.doi.org/10.1016/j.matlet.2006.05.079].   DOI   ScienceOn
17 C.-W. Nahm, Solid State Commun. 141, 685 (2007) [DOI: http://dx.doi.org/10.1016/j.ssc.2006.12.013].   DOI   ScienceOn
18 C.-W. Nahm, Ceram. Int. 36, 1495 (2010) [DOI: http://dx.doi. org/10.1016/j.ceramint.2010.02.027].   DOI   ScienceOn
19 C.-W. Nahm, J. Am. Ceram. Soc. 93, 3056 (2010) [DOI: http:// dx.doi.org/10.1111/j.1551-2916.2010.04027.x].   DOI   ScienceOn
20 C.-W. Nahm, Mater. Sci. Eng. B. 170, 123 (2010) [DOI: http:// dx.doi.org/10.1016/j.mseb.2010.03.036].   DOI   ScienceOn
21 C.-W. Nahm, J. Am. Ceram. Soc. 94, 328 (2011) [DOI: http:// dx.doi.org/10.1111/j.1551-2916.2010.04283.x].   DOI   ScienceOn
22 C.-W. Nahm, Ceram. Int. 37, 1409 (2011) [DOI: http://dx.doi. org/10.1016/j.ceramint.2011.01.011].   DOI   ScienceOn
23 J. C. Wurst and J. A. Nelson, J. Am. Ceram. Soc. 55, 109 (1972) [DOI: http://dx.doi.org/10.1111/j.1151-2916.1972.tb11224.x].   DOI
24 L. M. Levinson and H. R. Philipp, J. Appl. Phys. 46, 1332 (1975) [DOI: http://dx.doi.org/10.1063/1.321701].   DOI   ScienceOn
25 C.-W. Nahm, J. Am. Ceram. Soc. 93, 2297 (2010) [DOI: http:// dx.doi.org/10.1111/j.1551-2916.2010.03713.x].   DOI   ScienceOn