Figure 2: Thermoelectric properties as a function of temperature for x% K-doped PbTe0.7S0.3.
From: Broad temperature plateau for thermoelectric figure of merit ZT>2 in phase-separated PbTe0.7S0.3

(a) electrical conductivity, (b) Seebeck coefficient, (c) power factor, (d) total thermal conductivity, (e) lattice thermal conductivity, (f) figure of merit, ZT, the combined uncertainty for all measurements involved in the calculation of ZT is <15% (evaluated in terms of s.d.). Insets in a and b are experimental and calculated σ and α of 0.5% K- and 2.5% K-doped PbTe0.7S0.3.