15 research outputs found
Effect of CuO addition on the microstructure and electrical properties of SnO2-based varistor
Hyperfine, structural and electrical transport properties of the high-energy milled (1 − X).ZnO–X.FeO system
A 236 GHz Fe3+ EPR Study of Nanoparticles of the Ferromagnetic Room-Temperature Semiconductor Sn1−x Fe x O2 (x = 0.005)
Electronic ceramics based on polycrystalline SnO2, TiO2 and (Sn xTi1-x)O2 solid solution
Grain-Boundary Resistance and Nonlinear Coefficient Correlation for SnO2-Based Varistors
Evaluation of rare earth oxides doping SnO2.(Co1/4,Mn3/4)O-based varistor system
The present paper aims to verify the inuence of rare earth oxide such as lanthanum (La2O3) and neodymium (Nd2O3) doping SnO2 + 0.25%CoO + 0.75%MnO2 + 0.05%Ta2O5 system. The analysis focus on microstructural inuence on electrical properties. Microstructural analysis were made by using Transmission Electron Microscopy (TEM) at different regions of the samples. From such analysis it was found that La2O3 and Nd2O3 oxides cause heterogeneous segregation and precipitation at grain boundary concerning cobalt and manganese, decreasing the nonohmic electrical properties, as discussed, likely due to the increasing of grain boundary non-active potential barriers