Abstract
The effect of Sr substitution on electrical transport and thermoelectric properties of Y 1− x Sr x CoO 3 (0≤ x ≤0.2) has been investigated in the temperature range from 20 to 780 K. The Y 1− x Sr x CoO 3 samples with different Sr concentrations have been synthesized by using the sol–gel process. The results show that dc electrical resistivity of Y 1− x Sr x CoO 3 decreases remarkably with increasing Sr content x , which can be attributed to the reduction in lattice distortion. The Seebeck coefficients S of Y 1− x Sr x CoO 3 are all positive, indicating predominant hole-type charge carriers, and they decrease monotonously with increasing Sr content of substitution. Moreover, experiments show that the power factor changes non-monotonously with Sr substitution with a maximum value of 2.69×10 −5 W/m K 2 at 650 K for the sample x =0.05, which is about five times greater than that for x =0, indicating that appropriate Sr substitution can effectively improve thermoelectric properties of Y 1− x Sr x CoO 3 .
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