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• W2009133688 abstract "When PbTe, a good thermoelectric material, is doped with a few percent Tl, the figure of merit $ZT=T{S}^{2}/(ensuremath{rho}ensuremath{kappa})$ [$S$ is the Seebeck coefficient, $ensuremath{rho}$ the electrical resistivity, and $ensuremath{kappa}$ the thermal conductivity] is dramatically improved. The maximum value of $ZT$ occurs for approximately 2$%$ Tl, but the factors limiting $ZT$ are as yet poorly understood. From a detailed local structure study of PbTe:Tl using the extended x-ray absorption fine structure (EXAFS) technique, we find that Tl substitutes primarily as Tl(+1) on the Pb site, with no evidence for any solubility issue, any significant fraction of Tl(+3), or any Tl interstitials. However it is not a simple substitution as there is evidence for increasing Te vacancies on neighboring sites with increasing Tl concentration, $x$. In addition there is also increasing disorder with $x$---Tl-Te bond length disorder as well as the vacancy defects---that will scatter the hole carriers and begin to increase the electrical resistivity in spite of an increase in hole concentration. This increased disorder is likely an important factor limiting $ZT$." @default.
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• W2009133688 date "2013-04-22" @default.
• W2009133688 modified "2023-10-17" @default.
• W2009133688 title "Complex role for thallium in PbTe:Tl from local probe studies" @default.
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• W2009133688 doi "https://doi.org/10.1103/physrevb.87.144104" @default.
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