  We report the thermoelectric (TE) properties of (1-x)LaCoO3.xLa0.7Sr0.3MnO3
(0 < x < 0.10) composite in a temperature range 320-800 K. Addition of
La0.7Sr0.3MnO3 to LaCoO3 in small amount (5 weight %) improves the overall
Seebeck coefficient ({\alpha}) at higher temperatures. The electrical
conductivity, however, decreases due to a decrease in carrier concentration of
the composite. The decrease in electrical conductivity of the composite at high
temperature may be attributed to the insulating nature of the LSMO above room
temperature. Thermal conductivity (\k{appa}) of all the samples increases with
an increase in the temperature but decreases with increasing LSMO content. We
also report the local variation of the Seebeck coefficient across the composite
samples measured using a precision Seebeck measurement system. A maximum value
of 0.09 for the figure of merit (ZT) is obtained for
0.95LaCoO3.0.05La0.7Sr0.3MnO3 at 620 K which is significantly higher than the
ZT of either of LaCoO3 or La0.7Sr0.3MnO3 at 620 K. This suggests the potential
for enhancement of operating temperatures of hitherto well known
low-temperature thermoelectric materials through suitable compositing approach.
