Abstract
Intermetallic clathrates are promising materials for thermoelectric applications at elevated temperatures. In the search for cost-competitive representatives, we investigate the thermoelectric properties of quaternary type I clathrates with nominal compositions Ba8Cu x Si23-x Ge23 (4.5 ≤ x ≤ 7). The specimens were prepared by melting and annealing with subsequent ball milling and hot pressing. X-ray diffraction and energy-dispersive x-ray spectroscopy were used for an accurate structure determination and for an analysis of the phase purity and microstructure, respectively. The transport properties show a systematic variation with the Cu content in the clathrate phase. The highest dimensionless thermoelectric figure of merit ZT of 0.31 is achieved for Ba8Cu6Si17Ge23 at about 250°C (520 K).
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