Phase morphology effects on the thermoelectric properties of Pb 0.25Sn0.25Ge0.5Te

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Abstract

Seeking novel thermoelectric materials for power generation applications, the p-type Pb0.25Sn0.25Ge0.5Te composition is currently being investigated. This composition, lying in the miscibility gap of the quasi-ternary phase diagram of PbTe-GeTe-SnTe, exhibits a tendency for phase separation into fine submicron domains in addition to nearly optimized electronic properties. The maximal figure of merit, ZT, of ∼1.2 was obtained at 450 °C, showing a high thermoelectric potential. Possible routes for further enhancement of ZT up to ∼1.8, upon precise controlling of the morphological alignment of the involved phases, are described.

Original languageEnglish
Pages (from-to)1499-1507
Number of pages9
JournalActa Materialia
Volume61
Issue number5
DOIs
StatePublished - 1 Mar 2013

Keywords

  • Phase separation
  • Spinodal decomposition
  • Thermoelectric

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