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This study introduces the characteristics of current-voltage (I-V) and impedance variance for ZnO-Zn2BiVO6-Co3O4 (ZZCo), which is sintered at 900 ℃, according to temperature changes. ZZCo varistor demonstrates dramatic improvement of non-linear coefficient, α = 66, with lower leakage current and higher insulating resistivity than those of ZZ (ZnO-Zn2BiVO6) from the aspect of I-V curves. While both systems are thermally stable up to 125℃, ZZCo represents a higher grain boundary activation energy with 1.05 eV and 0.94 eV of J-E-T and from IS & MS, respectively, than that of ZZ with 0.73 eV and 0.82 eV of J-E-T and from IS & MS, respectively, in the region above 180℃. It could be attributed to the formation of (0.41~0.47 eV) as dominant defect in two systems, as well as the defect-induced capacitance increase from 781 pF to 1 nF in accordance with increasing temperature. On the other hand, both the grain boundary capacitances of ZZ and ZZCo are shown to decrease to 357 pF and 349 pF, respectively, while the resistances systems decreased exponentially, in accordance with increasing temperature. So, this paper suggests that the application of newly formed liquid phases as sintering additives in both Zn2BiVO6 and the ZZCo-based varistors would be helpful in developing commercialized devices such as chips, disk-type ZnO varistors in the future.
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참고문헌 (13)
참고문헌 신청
D. R. Clarke / 1999 / Varistor Ceramics / J. Am. Ceram. Soc 82(3):485~502
T. K. Gupta / 1990 / Application of Zinc Oxide Varistors / J. Am. Ceram. Soc 73(7):1817~1840
K. Eda / 1989 / Zinc Oxide Varistors / IEEE Elec. Insulation. Mag 5(6):28~41
R. Einzinger / 1987 / Metal Oxide Varistors / Ann. Rev. Mater. Sci 17:299~321
S. Hirose / 2008 / Effect of local electrical properties on the electrostatic discharge withstand capability of multilayered chip ZnO varistors / J. Appl. Phys 104:013701~013712
T. K. Gupta / 1990 / Application of Zinc Oxide Varistors / J. Am. Ceram. Soc 73(7):1817~1840
K. Eda / 1989 / Zinc Oxide Varistors / IEEE Elec. Insulation. Mag 5(6):28~41
R. Einzinger / 1987 / Metal Oxide Varistors / Ann. Rev. Mater. Sci 17:299~321
S. Hirose / 2008 / Effect of local electrical properties on the electrostatic discharge withstand capability of multilayered chip ZnO varistors / J. Appl. Phys 104:013701~013712
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