The Czochralski method was used to grow a -long crystal of the clathrate, which was cut into disks that were evaluated for thermoelectric performance. The Seebeck coefficient and electrical and thermal conductivities all showed evidence of a transition from extrinsic to intrinsic behavior in the range of . The corresponding figure of merit (ZT) was found to be a record high of 1.35 at and with an extrapolated maximum of 1.63 at . This makes the clathrate an exceptionally strong candidate for medium and high-temperature thermoelectric applications.
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