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Elemental distributions within multiphase quaternary Pb chalcogenide thermoelectric materials determined through three-dimensional atom probe tomography

Journal Article


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Abstract


  • Nanostructured multiphase p-type lead chalcogenides have shown the highest efficiencies amongst thermoelectric materials. However, their electronic transport properties have been described assuming homogenous distribution of dopants between phases. Here, we have analyzed elemental distributions in precipitates and matrices of nanostructured multiphase quaternary Pb chalcogenides doped to levels below and above the solubility limit of the matrix, using three-dimensional atom probe tomography. We demonstrate that partitioning of sodium and selenium occur between the matrix and secondary phase in both lightly- and heavily-doped compounds and that the concentrations of sodium and selenium in precipitates are higher than those in the matrices. This can contribute to the transport properties of such multiphase compounds The sodium concentration reached ~3 at% in sulfur-rich (PbS) precipitates and no nano precipitates of Na-rich phases were observed within either phase, a result that is supported by high resolution TEM analysis, indicating that the solubility limit of sodium in PbS is much higher than previously thought. However, non-equilibrium segregation of sodium is identified at the precipitates/matrix interfaces. These findings can lead to further advances in designing and characterizing multiphase thermoelectric materials.

Authors


  •   Aminorroaya-Yamini, Sima (external author)
  •   Li, Tong (external author)
  •   Mitchell, David R. G.
  •   Cairney, Julie M. (external author)

Publication Date


  • 2016

Citation


  • Yamini, A., Li, T., Mitchell, D. R. G. & Cairney, J. M. (2016). Elemental distributions within multiphase quaternary Pb chalcogenide thermoelectric materials determined through three-dimensional atom probe tomography. Nano Energy, 26 157-163.

Scopus Eid


  • 2-s2.0-84969548858

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=3038&context=aiimpapers

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/2036

Has Global Citation Frequency


Number Of Pages


  • 6

Start Page


  • 157

End Page


  • 163

Volume


  • 26

Place Of Publication


  • Netherlands

Abstract


  • Nanostructured multiphase p-type lead chalcogenides have shown the highest efficiencies amongst thermoelectric materials. However, their electronic transport properties have been described assuming homogenous distribution of dopants between phases. Here, we have analyzed elemental distributions in precipitates and matrices of nanostructured multiphase quaternary Pb chalcogenides doped to levels below and above the solubility limit of the matrix, using three-dimensional atom probe tomography. We demonstrate that partitioning of sodium and selenium occur between the matrix and secondary phase in both lightly- and heavily-doped compounds and that the concentrations of sodium and selenium in precipitates are higher than those in the matrices. This can contribute to the transport properties of such multiphase compounds The sodium concentration reached ~3 at% in sulfur-rich (PbS) precipitates and no nano precipitates of Na-rich phases were observed within either phase, a result that is supported by high resolution TEM analysis, indicating that the solubility limit of sodium in PbS is much higher than previously thought. However, non-equilibrium segregation of sodium is identified at the precipitates/matrix interfaces. These findings can lead to further advances in designing and characterizing multiphase thermoelectric materials.

Authors


  •   Aminorroaya-Yamini, Sima (external author)
  •   Li, Tong (external author)
  •   Mitchell, David R. G.
  •   Cairney, Julie M. (external author)

Publication Date


  • 2016

Citation


  • Yamini, A., Li, T., Mitchell, D. R. G. & Cairney, J. M. (2016). Elemental distributions within multiphase quaternary Pb chalcogenide thermoelectric materials determined through three-dimensional atom probe tomography. Nano Energy, 26 157-163.

Scopus Eid


  • 2-s2.0-84969548858

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=3038&context=aiimpapers

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/2036

Has Global Citation Frequency


Number Of Pages


  • 6

Start Page


  • 157

End Page


  • 163

Volume


  • 26

Place Of Publication


  • Netherlands