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In situ characterisation of nanostructured multiphase thermoelectric materials at elevated temperatures

Journal Article


Abstract


  • Multiphase thermoelectric materials have recently attracted considerable attention due to the high

    thermoelectric efficiencies which can be achieved in these compounds compared to their single-phase

    counterparts. However, there is very little known on the structural evolution of these phases as a function

    of temperature. In this work we performed an in situ high temperature structural characterisation of

    recently reported high efficiency p-type multiphase (PbTe)0.65(PbS)0.25(PbSe)0.1 compounds by hot stage

    transmission electron microscopy and high-resolution neutron powder diffraction. We observed the

    microstructural evolution of precipitates and determined the lattice parameters of phases as a function of

    temperature for materials, which have been heavily and lightly doped with sodium. The role of the sodium

    is to optimize the concentration of charge carriers. It has been shown to distribute heterogeneously

    between the phases in multiphase compounds. The dissolution of secondary phases is found to occur at

    elevated temperatures. Although sodium concentration produces no significant differences between the

    lattice constants of the phases and the dissolution sequence of precipitates, it affects quite significantly

    the kinetics of precipitation. The heavily doped samples reach structural thermodynamic equilibrium more

    quickly than the lightly doped compound. These results are a step forward in designing high performance

    multiphase thermoelectric materials.

Authors


  •   Aminorroaya-Yamini, Sima (external author)
  •   Mitchell, David R. G.
  •   Avdeev, Maxim (external author)

Publication Date


  • 2016

Citation


  • Aminorroaya-Yamini, S., Mitchell, D. R. G. & Avdeev, M. (2016). In situ characterisation of nanostructured multiphase thermoelectric materials at elevated temperatures. Physical Chemistry Chemical Physics, 18 (48), 32814-32819.

Scopus Eid


  • 2-s2.0-85003945000

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/2273

Number Of Pages


  • 5

Start Page


  • 32814

End Page


  • 32819

Volume


  • 18

Issue


  • 48

Place Of Publication


  • United Kingdom

Abstract


  • Multiphase thermoelectric materials have recently attracted considerable attention due to the high

    thermoelectric efficiencies which can be achieved in these compounds compared to their single-phase

    counterparts. However, there is very little known on the structural evolution of these phases as a function

    of temperature. In this work we performed an in situ high temperature structural characterisation of

    recently reported high efficiency p-type multiphase (PbTe)0.65(PbS)0.25(PbSe)0.1 compounds by hot stage

    transmission electron microscopy and high-resolution neutron powder diffraction. We observed the

    microstructural evolution of precipitates and determined the lattice parameters of phases as a function of

    temperature for materials, which have been heavily and lightly doped with sodium. The role of the sodium

    is to optimize the concentration of charge carriers. It has been shown to distribute heterogeneously

    between the phases in multiphase compounds. The dissolution of secondary phases is found to occur at

    elevated temperatures. Although sodium concentration produces no significant differences between the

    lattice constants of the phases and the dissolution sequence of precipitates, it affects quite significantly

    the kinetics of precipitation. The heavily doped samples reach structural thermodynamic equilibrium more

    quickly than the lightly doped compound. These results are a step forward in designing high performance

    multiphase thermoelectric materials.

Authors


  •   Aminorroaya-Yamini, Sima (external author)
  •   Mitchell, David R. G.
  •   Avdeev, Maxim (external author)

Publication Date


  • 2016

Citation


  • Aminorroaya-Yamini, S., Mitchell, D. R. G. & Avdeev, M. (2016). In situ characterisation of nanostructured multiphase thermoelectric materials at elevated temperatures. Physical Chemistry Chemical Physics, 18 (48), 32814-32819.

Scopus Eid


  • 2-s2.0-85003945000

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/2273

Number Of Pages


  • 5

Start Page


  • 32814

End Page


  • 32819

Volume


  • 18

Issue


  • 48

Place Of Publication


  • United Kingdom