Application of Thermomechanical Characterization Techniques to Bismuth Telluride Based Thermoelectric Materials

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The thermoelectric properties of bismuth telluride based thermoelectric (TE) materials are well-characterized, but comparatively little has been published on the thermomechanical properties. In this paper, dynamic mechanical analysis (DMA) and differential scanning calorimetry data for bismuth telluride based TE materials is presented. The TE materials' tan delta values, indicative of viscoelastic energy dissipation modes, approached that of glassy or crystalline polymers, were greater than ten times the tan delta of structural metals, and reflected the anisotropic nature of TE materials. DMA thermal scans showed changes in mechanical properties versus temperature with clear hysteresis effects. These results showed that the application ... continued below

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White, John B. August 2002.

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  • White, John B.

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The thermoelectric properties of bismuth telluride based thermoelectric (TE) materials are well-characterized, but comparatively little has been published on the thermomechanical properties. In this paper, dynamic mechanical analysis (DMA) and differential scanning calorimetry data for bismuth telluride based TE materials is presented. The TE materials' tan delta values, indicative of viscoelastic energy dissipation modes, approached that of glassy or crystalline polymers, were greater than ten times the tan delta of structural metals, and reflected the anisotropic nature of TE materials. DMA thermal scans showed changes in mechanical properties versus temperature with clear hysteresis effects. These results showed that the application of DMA techniques are useful for evaluation of thermophysical and thermomechanical properties of these TE materials.

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  • August 2002

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  • Sept. 26, 2007, 2:47 a.m.

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  • June 24, 2015, 2:34 p.m.

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White, John B. Application of Thermomechanical Characterization Techniques to Bismuth Telluride Based Thermoelectric Materials, thesis, August 2002; Denton, Texas. (digital.library.unt.edu/ark:/67531/metadc3166/: accessed June 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .