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Title: In situ neutron scattering study of nanostructured PbTe-PbS bulk thermoelectric material

Nanostructures play an important role in thermoelectric materials. Their thermal stability, such as phase change and evolution at elevated temperatures, is thus of great interest to the thermoelectric community. In this study, in situ neutron diffraction was used to examine the phase evolution of nanostructured bulk PbTe-PbS materials fabricated using hot pressing and pulsed electrical current sintering (PECS). The PbS second phase was observed in all samples in the as-pressed condition. The temperature dependent lattice parameter and phase composition data show an initial formation of PbS precipitates followed by a redissolution during heating. The redissolution process started around 570 600 K, and completed at approximately 780 K. During cooling, the PECS sample followed a reversible curve while the heating/cooling behavior of the hot pressed sample was irreversible.
 [1] ;  [2] ;  [3] ;  [2]
  1. Temple University
  2. ORNL
  3. Michigan State University, East Lansing
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Conference: the 35th International Conference & the 1st Asian Conference on Thermoelectrics, Wuhan, China, 20160529, 20160529
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
neutron diffraction; high temperature; thermoelectrics