Bloating in (Pb 0.95Sn 0.05Te) 0.92(PbS) 0.08-0.055%PbI 2 thermoelectric specimens as a result of processing conditions

Jennifer E. Ni, Eldon D. Case, Ryan Stewart, Chun I. Wu, Timothy P. Hogan, Mercouri G. Kanatzidis

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Lead chalcogenides such as (Pb 0.95Sn 0.05Te) 0.92(PbS) 0.08-0.055%PbI 2 have received attention due to their encouraging thermoelectric properties. For the hot pressing (HP) and pulsed electric current sintering (PECS) techniques used in this study, decomposition reactions can generate porosity (bloating). Porosity in turn can degrade electrical, thermal, and mechanical properties. In this study, microstructural observations (scanning electron microscopy) and room-temperature elasticity measurements (resonant ultrasound spectroscopy) were used to characterize bloating generated during post-densification anneals. Although every HP specimen bloated during post-densification annealing, no bloating was observed for the PECS specimens processed from dry milled only powders. The lack of bloating for the annealed PECS specimens may be related to the electrical discharge intrinsic in the PECS process, which reportedly cleans the powder particle surfaces during densification.

Original languageEnglish
Pages (from-to)1153-1158
Number of pages6
JournalJournal of Electronic Materials
Volume41
Issue number6
DOIs
Publication statusPublished - Jun 1 2012

Keywords

  • Thermoelectrics
  • Young's modulus
  • porosity
  • resonant ultrasound spectroscopy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering
  • Materials Chemistry

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