By M. S. Dresselhaus, Y.-M. Lin, O. Rabin (auth.), M. G. Kanatzidis, S. D. Mahanti, T. P. Hogan (eds.)
This quantity: Chemistry, Physics and fabrics technology of Thermoelectric fabrics: past Bismuth Telluride includes a sequence of topical articles that have been offered as invited lectures through well known leaders during this box at a workshop held in Traverse urban, Michigan in the summertime of 2002. those articles position the cutting-edge, relating to layout ideas, candidate fabrics and structures and present advances in context and will function an invaluable resource of insights into this box for either starting scholars and practitioners alike.
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Extra info for Chemistry, Physics, and Materials Science of Thermoelectric Materials: Beyond Bismuth Telluride
Long scattering times are more likely in materials containing elements of similar electronegativity, reducing polar scattering. The scattering time is determined by the scattering potential and the density of initial and final electronic and phonon states. ) as well as the scattering potential and indirectly on m*, since this parameterizes the density of electronic states. Early authors considering this problem explicitly put the m* dependence into the formula for the scattering time and then compare scattering rates.
When heat propagates parallel to the needle axis of K2Bis_xSbxSe13 it flows through the relatively regular Bi2Te3-type and NaCI-type rods, which present an extended but regular medium made of Bi-Se bonds. 2 A which 50 favors a relatively long mean free phonon path. In contrast, when heat propagates in the perpendicular direction, which is the direction of a large lattice constant (a- 17_, c- 18->, the acoustic phonons strongly scatter from the K+ ions and the high coordinated sites K(l) and M(8) that serve as barriers and interrupt the Bi/Sb/Se framework.
During the course of our investigation, we found a few single crystals of a new compound, KzHgBizTes, that were formed on the container walls from the reaction of HgI z and K 3BiTe3. This new compound is 2-dimensional and contains [HgBizTest layers separated from each other by K+ ions (Figure 4). The single crystals formed from these reactions are of extremely poor quality, but it was found that better single crystals could be formed by stoichiometrically combining K zTe, HgTe, Bi, and Te. The compound shows surface oxidation after exposure to air for a few weeks.