Room-temperature mechanical properties of LAST (Pb-Sb-Ag-Te) thermoelectric materials as a function of cooling rate during ingot casting

F. Ren, E. D. Case, B. D. Hall, J. E. Ni, E. J. Timm, C. I. Wu, J. J. D'Angelo, T. P. Hogan, E. Lara-Curzio

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

In this study, we focus on the room-temperature mechanical properties of LAST (Pb-Sb-Ag-Te) materials fabricated using casting with slow-cool temperature profiles (cooling rate 5C h-1) including biaxial flexural strength, indentation hardness, Young's modulus, and dynamic elastic moduli. The slow-cooled specimens exhibited values of Young's modulus and hardness that are comparable to those of previously reported fast-cooled LAST materials (cooling rate 5C h-1). The higher biaxial flexural strength is potentially beneficial for the mechanical integrity of thermoelectric devices.

Original languageEnglish
Pages (from-to)267-275
Number of pages9
JournalPhilosophical Magazine Letters
Volume89
Issue number4
DOIs
StatePublished - Apr 2009
Externally publishedYes

Funding

The authors acknowledge the financial assistance of the Office of Naval Research MURI Grant number N000140310789 and the US Department of Energy Grant DE-FC26-04NT42281. The research work at the High Temperature Materials Laboratory was sponsored by the Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Freedom CAR and Vehicle Technologies, as part of the High Temperature Materials Laboratory User Program, Oak Ridge National Laboratory, managed by UT-Battelle, LLC, for the US Department of Energy under contract number DE-AC05-00OR22725.

Keywords

  • Casting
  • Elasticity
  • Fracture strength
  • Hardness
  • Indentation
  • Thermoelectric materials

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