ZnO-Zn2BiVO6-Co3O4 바리스터의 전류-전압 및 임피던스의 온도 특성
Current-Voltage and Impedance Characteristics of ZnO-Zn2BiVO6-Co3O4 Varistor with Temperature
1
조회
0
다운로드
2
인용
0
참고문헌
키워드
초록
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.
Abstract
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.
참고문헌 (13)
- D. R. Clarke, "Varistor Ceramics", J. Am. Ceram. Soc, 82(3), pp.485~502 (1999)
- T. K. Gupta, "Application of Zinc Oxide Varistors", J. Am. Ceram. Soc, 73(7), pp.1817~1840 (1990)
- K. Eda, "Zinc Oxide Varistors", IEEE Elec. Insulation. Mag, 5(6), pp.28~41 (1989)
- R. Einzinger, "Metal Oxide Varistors", Ann. Rev. Mater. Sci, 17, pp.299~321 (1987)
- S. Hirose, "Effect of local electrical properties on the electrostatic discharge withstand capability of multilayered chip ZnO varistors", J. Appl. Phys, 104, pp.013701~013712 (2008)
- M. Mirzayi, "Effect of V2O5 on electrical and microstructural properties of ZnO ceramics", Physica B, 414, pp.50~55 (2013)
- C. W. Nahm, "Er2O3 Doping Effect on Electrical Properties of ZnO-V2O5-MnO2-Nb2O5 Varistor Ceramics", J. Am. Ceram. Soc, 94(10), pp.3227~3229 (2011)
- M. Bosacka, "Phase relations in the system ZnO-BiVO4 : the synthesis and properties of BiZn2VO6", Thermochimica Acta, 428(1-2), pp.51~55 (2005)
- M. Andres-Verges, "Impedance and Modulus Spectroscopy of ZnO Varistor", J. Electroceram, 1(2), pp.125~132 (1997)
- 홍연우, "ZnO-Bi₂O₃-Co₃O₄ 바리스터의 전기적 특성", 전기전자재료학회논문지, 24(11), pp.882~889 (2011), 한국전기전자재료학회
- A. B. Alles, "The effect of liquid-phase sintering on the properties of Pr6O11-based ZnO varistors", J. Appl. Phys, 71(11), pp.6883~6890 (1991)
- K. Mukae, "Zinc oxide varistors with praseodymium oxide", Am. Ceram. Soc. Bull, 66(9), pp.1329~1331 (1987)
- F. Greuter, "Electrical properties of grain boundaries in polycrystalline compound semiconductors", Semicond. Sci. Technol, 5(2), pp.111~137 (1990)