Abstract
The microstructure, electrical properties, and stability against DC accelerated aging stress of the varistor ceramics, which are composed of ZnO–Pr6O11–CoO–Cr2O3–La2O3-based ceramics, were investigated for various La2O3 contents. The increase of La2O3 content led to more densified ceramics, whereas abruptly decreased the nonlinear properties by incorporating beyond 1.0 mol%. The highest nonlinearity was obtained from 0.5 mol% La2O3, in which the nonlinear exponent is 81.6 and the leakage current is 0.1 μA. As the La2O3 content increased, the donor concentration increased in from 0.64 × 1018 to 16.89 × 1018/cm3 and the barrier height greatly decreased with increasing La2O3 content, reaching a maximum (1.47 eV) in 0.5 mol% La2O3. The varistors doped with 0.5 mol% La2O3 exhibited high stability, in which the variation rates of varistor voltage, nonlinear exponent, and leakage current were −1.14%, −3.7%, and +100%, respectively, for stressing state of 0.95 V 1 mA/150 °C/24 h.
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Levinson LM, Pilipp HR (1986) Amer Ceram Soc Bull 65:639
Gupta TK (1990) J Amer Ceram Soc 73:1817
Lee YS, Tseng TY (1992) J Amer Ceram Soc 75:1636
Alles AB, Burdick VL (1991) J Appl Phys 70:6883
Alles AB, Puskas R, Callahan G, Burdick VL (1993) J Am Ceram Soc 76:2098
Lee Y-S, Liao K-S, Tseng T-Y (1996) J Amer Ceram Soc 79:2379
Wakiya N, Chun SY, Lee CH, Sakurai O, Shinozaki K, Mizutani N (1999) J Electroceram 4(S1):15
Chun SY Mizutani N (2001) Mater Sci Eng B79:1
Nahm C-W (2001) Mater Lett 47:182
Nahm C-W (2002) Mater Lett 53:110
Nahm C-W (2003) J Europ Ceram Soc 23:1345
Nahm C-W (2003) Mater Lett 57:1317
Nahm C-W (2003) Mater Lett 57:1322
Nahm C-W, Shin B-C (2004) Ceram Int 30:9
Nahm C-W (2003) Solid State Commun 127:389
Nahm C-W (2004) Mater Lett 58:2252
Nahm C-W (2004) Mater Lett 58:3297
Wurst JC, Nelson JA (1972) J Am Ceram Soc 55:109
Mukae M, Tsuda K, Nagasawa I (1979) J Appl Phys 50:4475
Hozer L (1994) Semiconductor ceramics: grain boundary effects. Ellis Horwood, p 22
Fan J, Freer R (1994) J Amer Cearm Soc 77:2663
Mukae K (1987) Am Ceram Soc Bull 66:1329
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Nahm, CW. Electrical properties and stability against DC accelerated aging stress of lanthania doped praseodymia-based zinc oxide varistor ceramics. J Mater Sci 41, 7272–7278 (2006). https://doi.org/10.1007/s10853-006-0142-4
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DOI: https://doi.org/10.1007/s10853-006-0142-4