Phase separation and nanostructuring in the thermoelectric material PbTe1-xSx

Details Phase separation and nanostructuring in the thermoelectric material PbTe1-xSx Phase separation and nanostructuring in the thermoelectric material PbTe1-xSx

2006-12-15

arxiv.org/abs/cond-mat/0612414v1

Physics

Condensed Matter

Materials Science

9 pages, 9 figures, 4 tables, submitted to PRB

Scientific paper

The average and local structures of the (PbTe)1-x(PbS)x system of thermoelectric materials has been studied using the Rietveld and atomic pair distribution function (PDF) methods. Samples with 0:25 < x are macroscopically phase separated. Phase separation was suppressed in a quenched x = 0:5 sample which, nonetheless, exhibited a partial spinodal decomposition. The promising thermoelectric material with x = 0:16 showed intermediate behavior. Combining TEM and bulk scattering data suggests that the sample is a mixture of PbTe rich material and a partially spinodally decomposed phase similar to the quenched 50% sample. This results in a nano-meter scale inhomogeneous material that accounts for its very low thermal conductivity.

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