Effect of partial substitution of lead by gallium, indium, and thallium on thermoelectric properties of PbTe

Complex role for thallium in PbTe:Tl from local probe studies

“…%); 3% (3.06 %). Thus within this concentration range, Tl is going into the sample, in agreement with Rustamov et al 19 who reported a solubility > 5 %. However transport measurements or x-ray absorption edge steps are not sensitive as to how Tl enters the sample; i.e are there nano-precipitates present or is charge compensation occurring?…”

“…These values of S are also similar to other published works. 4,19 Since the thermal conductivity, κ, above room temperature changes little with Tl doping 4 the dominant factor determining the figure of merit, ZT , is the electrical resistivity. As shown in Fig.…”