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International round-robin study of the thermoelectric transport properties of an n-type half-Heusler compound from 300 K to 773 K

: Wang, H.S.; Bai, S.Q.; Chen, L.D.; Cuenat, A.; Joshi, G.; Kleinke, H.; König, J.; Lee, H.W.; Martin, J.; Oh, M.W.; Porter, W.D.; Ren, Z.F.; Salvador, J.; Sharp, J.; Taylor, P.; Thompson, A.J.; Tseng, Y.C.


Journal of Electronic Materials 44 (2015), No.11, pp.4482-4491
ISSN: 0361-5235
ISSN: 1543-186X
Journal Article
Fraunhofer IPM ()

International transport property-measurement round-robins have been conducted by the thermoelectric annex under the International Energy Agency (IEA) Implementing Agreement on Advanced Materials for Transportation (AMT). Two previous round-robins used commercially available bismuth telluride as the test material, with the objectives of understanding measurement issues and developing standard testing procedures. This round-robin extended the measurement temperature range to 773 K. It was designed to meet the increasing demands for reliable transport data for thermoelectric materials used for power-generation applications. Eleven laboratories from six IEA-AMT member countries participated in the study. A half-Heusler (n-type) material prepared by GMZ Energy was selected for the round-robin. The measured transport properties had a narrower distribution of uncertainty than previous round-robin results. The study intentionally included multiple testing methods and instrument types. Over the full temperature range, the measurement discrepancies for the figure of merit, ZT, in this round-robin were +/- 11.5 to +/- 16.4% from the averages.