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Published May 1, 2016 | Published
Journal Article Open

Dislocation strain as the mechanism of phonon scattering at grain boundaries


Thermal conductivities of polycrystalline thermoelectric materials are satisfactorily calculated by replacing the commonly used Casimir model (freqeuncy-independent) with grain boundary dislocation strain model (frequency-dependent) of Klemens. It is demonstrated that the grain boundaries are better described as a collection of dislocations rather than perfectly scattering interfaces.

Additional Information

© 2016 The Royal Society of Chemistry. Received 14 Dec 2015, Accepted 22 Feb 2016, First published online 26 Feb 2016. The authors would like to acknowledge funding from the Solid-State Solar-Thermal Energy Conversion Center (S3TEC), an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Basic Energy Sciences under Award # DE-SC0001299. H.-S. Kim gratefully acknowledge financial support from Samsung Advanced Institute of Technology (SAIT). The authors would like to acknowledge useful discussions with Dr. Zachary Gibbs.

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