Synthesis and electrical conduction behaviour of strontium yttrium titanium cobalt oxide (Sr1-xYxTi1-xCoxO3, 0.01 <= x <= 0.10)

Various compositions in the valence compensated solid solution system Sr1-x YxTi1-xCoxO3 (0.01 less than or equal to x less than or equal to 0.10) have been synthesized by solid state ceramic method. Crystal structure, density and porosity of these compositions have been determined. DC resistivity an d Seebeck coefficient of all the samples have been measured as a function o f temperature in the range 300-1000 K. Positive values of Seebeck coefficie nt in the entire temperature range of measurement shows that holes are the majority charge carriers. Conductivity increases with increasing x indicati ng that conduction occurs mainly because of cobalt ions. Post-sintering tre atments viz (I) quenching the samples after sintering and (II) annealing in air at 1000 degreesC after sintering do not affect the electrical properti es of these materials significantly. (C) 2001 Elsevier Science B.V. All rig hts reserved.