Room temperature Young's modulus, shear modulus, Poisson's ratio and hardness of PbTe-PbS thermoelectric materials

Jennifer E. Ni, Eldon D. Case, Kristen N. Khabir, Ryan C. Stewart, Chun I. Wu, Timothy P. Hogan, Edward J. Timm, Steven N. Girard, Mercouri G Kanatzidis

Research output: Contribution to journalArticle

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Abstract

Two-phase PbTe-PbS materials, in which PbS is a nanostructured phase, are promising thermoelectric materials for the direct conversion of heat energy into electricity. In this study, a Vickers indentation mean hardness of 1.18 ± 0.09 GPa was measured for hot pressed specimens Pb0.95Sn0.05Te-PbS 8% while the mean hardness of cast specimens was 0.68 ± 0.07 GPa. The mean fracture toughness of the not pressed specimens was estimated as 0.35 ± 0.04 MPa m1/2 via Vickers indentation. Resonant Ultrasound Spectroscopy (RUS) measurements on hot pressed specimens gave mean values of Young's modulus, shear modulus and Poisson's ratio of 53.1 GPa, 21.4 GPa and 0.245, respectively while for the cast specimens the Young's and shear moduli were about 10% lower than for the hot pressed, with a mean value of Poisson's ratio of 0.245. The differences between the hardness and elastic moduli values for the cast and hot pressed specimens are discussed.

Original languageEnglish
Pages (from-to)58-66
Number of pages9
JournalMaterials Science and Engineering B
Volume170
Issue number1-3
DOIs
Publication statusPublished - Jun 15 2010

Fingerprint

thermoelectric materials
Poisson ratio
modulus of elasticity
hardness
Elastic moduli
Hardness
shear
room temperature
casts
Indentation
indentation
Temperature
Fracture toughness
electricity
fracture strength
Electricity
Ultrasonics
Spectroscopy
heat
spectroscopy

Keywords

  • Elasticity
  • Hardness
  • Lead telluride
  • Powder processing
  • Thermoelectric

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering
  • Mechanics of Materials

Cite this

Room temperature Young's modulus, shear modulus, Poisson's ratio and hardness of PbTe-PbS thermoelectric materials. / Ni, Jennifer E.; Case, Eldon D.; Khabir, Kristen N.; Stewart, Ryan C.; Wu, Chun I.; Hogan, Timothy P.; Timm, Edward J.; Girard, Steven N.; Kanatzidis, Mercouri G.

In: Materials Science and Engineering B, Vol. 170, No. 1-3, 15.06.2010, p. 58-66.

Research output: Contribution to journalArticle

Ni, Jennifer E. ; Case, Eldon D. ; Khabir, Kristen N. ; Stewart, Ryan C. ; Wu, Chun I. ; Hogan, Timothy P. ; Timm, Edward J. ; Girard, Steven N. ; Kanatzidis, Mercouri G. / Room temperature Young's modulus, shear modulus, Poisson's ratio and hardness of PbTe-PbS thermoelectric materials. In: Materials Science and Engineering B. 2010 ; Vol. 170, No. 1-3. pp. 58-66.
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