Influence of MgO Doping on the Characteristics of ZnO-based Linear Resistance Ceramics

Al2O3 and MgO doped ZnO-based linear resistor ceramics were prepared.The effects of MgO additive contents on the resistivity,temperature coefficient and relative density of ZnO conductive ceramics were investigated.V-Icharacteristic of ZnO conductive ceramics under low current were analyzed.The results show that the obtained ZnO-Al2O3-MgO conductive ceramics have linear V-I characteristic under low current.Resistivity and resistance temperature coefficient can be improved with MgO doping.When MgO content is 5%,resistivity and resistance temperature coefficient is 178 Ω·cm,-1.5×10-3/℃ respectively.Moderate amount of MgO can promote the densification of ZnO-based ceramics.