Microstructure and electrical properties of rare-earth oxides doped ZnO-based linear resistance ceramics
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The ZnO-based linear resistance ceramics doped with rare-earth oxides (Y2O3, La2O3) have been prepared by the conventional ceramics method. The effect of the different doping amounts of rare-earth oxides on the microstructure, electrical properties and aging behavior were investigated in detail. The electrical properties analysis shows that the La2O3 addition on ZnO-based linear resistance ceramics has more obviously influence than the addition of Y2O3. The samples with the La2O3 content of 0.25 mol% sintered at 1,320 °C exhibits excellent electrical properties with the resistivity of 253.5 Ω cm and the resistance temperature coefficient of 3.62 × 10−4/ °C, which are improved by 60 and 90 %, respectively. The nonlinear coefficient of voltage decreases to 1.16, decreases by 4.3 % and the stability of −1.2 % in the variation rate of the resistivity for aging temperature.
KeywordsY2O3 La2O3 Donor Concentration Nonlinear Coefficient ZnAl2O4
This work was supported by the Key Project of Chinese Ministry of Education (No 210218), Scientific and technological project of Wenzhou (H20100079, H20100087), and the Graduate Innovation Fund of Shaanxi University of Science and Technology.
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