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Effect of disorder on the thermal transport and elastic properties in thermoelectric Zn4Sb3

Bhattacharya, S. and Hermann, R. P. and Keppens, V. and Tritt, T. M. and Snyder, G. J. (2006) Effect of disorder on the thermal transport and elastic properties in thermoelectric Zn4Sb3. Physical Review B, 74 (13). Art. No. 134108. ISSN 1098-0121. doi:10.1103/PhysRevB.74.134108.

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Zn4Sb3 undergoes a phase transition from alpha to beta phase at T1[approximate]250 K. The high temperature beta-Zn4Sb3 phase has been widely investigated as a potential state-of-the-art thermoelectric (TE) material, due to its remarkably low thermal conductivity. We have performed electronic and thermal transport measurements exploring the structural phase transition at 250 K. The alpha to beta phase transition manifests itself by anomalies in the resistivity, thermopower, and specific heat at 250 K as well as by a reduction in the thermal conductivity as Zn4Sb3 changes phase from the ordered alpha to the disordered beta-phase. Moreover, measurements of the elastic constants using resonant ultrasound spectroscopy (RUS) reveal a dramatic softening at the order-disorder transition upon warming. These measurements provide further evidence that the remarkable thermoelectric properties of beta-Zn4Sb3 are tied to the disorder in the crystal structure.

Item Type:Article
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Hermann, R. P.0000-0002-6138-5624
Snyder, G. J.0000-0003-1414-8682
Additional Information:©2006 The American Physical Society (Received 7 June 2006; revised 1 August 2006; published 17 October 2006) We would like to acknowledge Franck Gascoin for his help in preparing the samples. We would also like to thank Brian Sales for valuable discussions. Work at The University of Tennessee is supported by the National Science Foundation under Grant No. DMR 0506292. The work at Clemson University was supported through DOE Grant No. DEFG02-04ER-46139 and SC EPSCoR.
Subject Keywords:zinc compounds; thermoelectric power; elastic constants; order-disorder transformations; thermal conductivity; electrical resistivity; specific heat
Issue or Number:13
Record Number:CaltechAUTHORS:BHAprb06
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:6191
Deposited By: Archive Administrator
Deposited On:28 Nov 2006
Last Modified:08 Nov 2021 20:31

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