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The thermoelectric power factor of a composite medium

The thermoelectric power factor P/sub e/ of a composite medium built of two serially connected planar components has been studied theoretically as a function of the volume fractions p/sub 1/,p/sub 2/=1-p/sub 1/. This simplest case of composition shows that P/sub e/(p/sub 1/) can be enhanced to a maximum value that is greater than the power factors in both components if their thermoelectric properties satisfy certain algebraic inequalities, which are presented here. We have found that in a metal-thermoelectric composite, P/sub e/(p/sub max/) is achieved at a very small thermoelectric fraction p/sub max//spl Lt/1 but at a relatively large composite figure of merit /spl Delta//sub e/.