Thermoelectric Properties of <Emphasis Type="Italic">n</Emphasis>-Type Multiple-Filled Skutterudites |
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Authors: | X Shi J R Salvador J Yang H Wang |
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Affiliation: | (1) Materials and Processes Laboratory, General Motors R&D Center, Warren, MI 48090, USA;(2) Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA |
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Abstract: | Filled skutterudites are prospective intermediate temperature materials for␣thermoelectric power generation. CoSb3-based n-type filled skutterudites have good electrical transport properties with power factor values over 40 μW/cm K2 at elevated temperatures. Filling multiple fillers into the crystallographic voids of skutterudites would help scatter a
broad range of lattice phonons, thus resulting in lower lattice thermal conductivity values. We report the thermoelectric
properties of n-type multiple-filled skutterudites between 5 K and 800 K. The combination of different fillers inside the voids of the skutterudite
structure shows enhanced phonon scattering, and consequently a strong suppression of the lattice thermal conductivity. Very
good power factor values are achieved in multiple-filled skutterudite compared with single-element-filled materials. The dimensionless
thermoelectric figure of merit for n-type filled skutterudites is improved through multiple-filling in a wide temperature range. |
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Keywords: | Thermoelectric skutterudite thermal conductivity multiple-filling |
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