Preparation and Electrical-conductive Property of SnO_2- based Ceramics with 0.5 CuO and Sb_2O_3

摘要

In this study, SnO_2-based ceramics, with 0.5%CuO as sintering aid and Sb_2O_3 as activator of the electrical conductivity, was obtained by pressureless sintering at 1450°C for 5 h. Densification behavior and microstructure development strongly depend on Sb_2O_3. The characteristization of microstructures on Sb_2O_3 concentrations are analyzed by SEM. A small amount of CuO improves densification; Sb_2O_3 retards the densification of SnO_2-based ceramic. The electrical resistivities of SnO_2-based ceramics with different contents of Sb_2O_3 are measured by the standard four probe method and varied in a wide range. The electrical resistivity arrives the minimal value of 4.964×10~(-2) Ω·cm for 99%SnO_2+0.5%CuO +0.5%Sb_2O_3. More content of Sb_2O_3 than that of CuO causes the degression of density and the increasing of electrical resistivity of ceramics.