Anomalous temperature-dependent Young’s modulus of a cast LAST (Pb–Sb–Ag–Te) thermoelectric material

Thermomechanical characterization is important to material evaluation and device design in the development of thermoelectric technology. In this study, we utilize the resonant ultrasound spectroscopy (RUS) technique to examine the elastic behavior of a cast LAST (Pb–Sb–Ag–Te) material with a composi...

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Bibliographic Details
Published in:Acta materialia 2010, Vol.58 (1), p.31-38
Main Authors: Ren, F., Case, E.D., Timm, E.J., Lara-Curzio, E., Trejo, R.M.
Format: Article
Language:English
Subjects:
Applied sciences
Casting
DESIGN
Elastic behaviour
EVALUATION
Exact sciences and technology
HEATING
HYSTERESIS
MATERIALS SCIENCE
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Order–disorder phenomena
Semiconductor
SPECTROSCOPY
THERMOELECTRIC MATERIALS
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Summary:Thermomechanical characterization is important to material evaluation and device design in the development of thermoelectric technology. In this study, we utilize the resonant ultrasound spectroscopy (RUS) technique to examine the elastic behavior of a cast LAST (Pb–Sb–Ag–Te) material with a composition of Ag 0.86Pb 19Sb 1.0Te 20 between room temperature and 823 K. The temperature-dependent Young’s modulus exhibits a monotonically decreasing trend with increasing temperature. However, an abnormal slope change in the Young’s modulus–temperature curve around 500 K is observed. In addition, hysteresis between heating and cooling data in the temperature range of 450–550 K is observed, which appears to be dependent on the heating/cooling rate during the RUS experiments such that the hysteresis disappears when the heating/cooling rate was decreased from 5 to 2 K min –1. In this study we propose an order–disorder transition model for the anomalous temperature-dependent Young’s modulus behavior observed in this study.
ISSN:1359-6454
1873-2453
DOI:10.1016/j.actamat.2009.08.054