Abstract
The local structure of the $\mathrm{Ag}{\mathrm{Pb}}_{m}\mathrm{Sb}{\mathrm{Te}}_{m+2}$ series of thermoelectric materials has been studied using the atomic pair distribution function (PDF) method. Three candidate-models were attempted for the structure of this class of materials using either a one- or a two-phase modeling procedure. Combining modeling the PDF with HRTEM data we show that $\mathrm{Ag}{\mathrm{Pb}}_{m}\mathrm{Sb}{\mathrm{Te}}_{m+2}$ contains nanoscale inclusions with composition close to $\mathrm{Ag}{\mathrm{Pb}}_{3}\mathrm{Sb}{\mathrm{Te}}_{5}$ randomly embedded in a PbTe matrix.
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