Probing Phonon Scattering Sites in the Thermoelectric Clathrate Eu8Ga16Ge30 |
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| Authors: | F. Bridges R. Baumbach D. Cao P. Chesler M. Anderson B. Sales |
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| Affiliation: | 1. Department of Physics, University of California, Santa Cruz, CA 95064, USA;2. Solid State Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6393, USA |
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| Abstract: | The low thermal conductivity of the Thermoelectric Clathrates Eu8Ga16Ge30 and Sr8Ga16Ge30 has been attributed to rattling atoms (Eu or Sr) in the Eu2/Sr2 sites. The low Einstein temperature obtained using XAFS for the nearest neighbor Eu-Ga/Ge bonds at the Eu2 sites is consistent with the model. However, the comparable Einstein temperature for the Eu1 site indicates that Eu1 is also a rattler. The fit also confirms that the Eu2 is displaced along either the y or z axis ～ 0.45Å in agreement with neutron diffraction. |
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| Keywords: | Clathrate XAFS Thermoelectric Rattler Eu8Ga16Ge30 Sr8Ga16Ge30 |
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