Phase separation and nanostructuring in the thermoelectric material PbTe1-xSx

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

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Materials Science, Other Condensed Matter

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http://salesiana.dossiersoluciones.com/handle/123456789/120031

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/0612414
 http://arxiv.org/abs/cond-mat/0612414

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arXiv