Use of Impedance Spectroscopy in the Study of the Effect of Cr Concentration on the Electrical Properties of SnO2-Based Ceramics
This paper reports a study of influence of Cr concentration on the electrical properties and microstructure of SnO2-based powders doped with Mn and Nb, prepared by an organic route (Pechini method). All the samples were compacted into discs and sintered at 1300°C for 3h, resulting in ceramics with relative density varying between 78% and 98%. The powders were characterized by X-ray diffraction analysis. Impedance spectroscopy characterization indicated that the conductivity decreases as Cr concentration increases, probably due to Cr segregation at grain boundaries, which reduces grain size, increasing the number of resistive boundaries.
Lucio Salgado and Francisco Ambrozio Filho
D. R. Leite et al., "Use of Impedance Spectroscopy in the Study of the Effect of Cr Concentration on the Electrical Properties of SnO2-Based Ceramics", Materials Science Forum, Vols. 498-499, pp. 337-341, 2005