Effect of Sb2O3 addition on the varistor characteristics of ZnO-Bi2O3-ZrO2-MtrO (Mtr = Mn, Co) |
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Authors: | Han Ik Oh Jin Ho Kim |
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Affiliation: | (1) Department of Inorganic Materials Engineering, Kyungpook National University, Daegu, 702-701, Korea |
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Abstract: | Effect of Sb2O3 addition on the varistor characteristics of pyrochlore-free ZnO-Bi2O3-ZrO2-MtrO (Mtr = Mn, Co) system previously proposed has been studied. With Sb2O3 up to 0.1 mol%, a gradual enhancement of densification and the grain growth inhibition were seen in the system sintered between
900 and 1200∘C. In X-ray diffraction patterns, small amount of pyrochlore appeared in the specimens doped with Sb2O3 (>0.06 mol%), which is thought responsible for the sintering behavior. Enhanced values of non linear coefficient (α) were
obtained in ZnO-Bi2O3-ZrO2 (ZBZ) doped with 0.001 mol% Sb2O3, but was leveled off at higher concentrations. In ZBZ added with MtrO (Mtr = Mn, Co), significant increase of nonlinear coefficient (α > 30) along with low leakage current (I
L ≪ 100 μA/cm2) was attained. The α-enhancement effect of Sb2O3, however, was not observed in high-α ZBZ added with MtrO. As for degradation, addition of a trace amount (0.001 mol%) of Sb2O3 to ZBZMtr was efficient, especially in I
L. |
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Keywords: | ZnO varistor ZrO2 Sb2O3 Varistor characteristics Degradation |
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