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In the work, a modified effective medium theory is constructed forcalculating the effective properties of thermoelectric composites withdifferent values of percolation thresholds. It is shown that even atconcentrations beyond the critical region, the threshold value is essential fordetermining the effective properties. Two fundamentally different cases of aset of local properties of the composite are considered. In one of these cases,the conductivity and thermal conductivity of one of the phases issimultaneously greater than the conductivity and thermal conductivity of theother phase. The second, anomalous case, when the electrical conductivity ofthe first phase is greater than that of the second, but the thermalconductivity of the first phase is less than that of the second, shows unusualconcentration behavior of effective conductivity, i.e. with an increase in thewell-conducting phase, the effective conductivity shows a decrease (rather thangrowth as in the standard case), which at goes over to growth.

Effective medium theory for the thermoelectric properties of composite materials with various percolation thresholds