Berlin 2012 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 22: Functional Materials I

MM 22.2: Vortrag

Dienstag, 27. März 2012, 10:30–10:45, H 1029

Reference materials for traceable measurements of thermoelectric properties from 300 K to 900 K — Frank Edler¹, •Ernst Lenz¹, and Pawel Ziolkowski² — ¹Physikalisch Techni-sche Bundesanstalt, Berlin, Germany — ²German Aerospace Center - Institute of Materials Research, Germany

Thermoelectric generators for converting wasted heat directly into electric energy are of increasing interest during the last years. The efficiency of those generators is normally expressed by the dimensionless figure of merit which scales with the square of the Seebeck coefficient. However, traceable reference materials for Seebeck coefficients in the temperature range of 300 K to 900 K are still not available. The intention of the project "Metrology for Energy Harvesting" founded by the European metrology organization is to provide those reference materials [1].

A metallic nickel copper alloy (CuNi44) and a semicoducting iron disilicide (Fe_0.95Co_0.05Si₂) will be presented as two possible reference materials. A relative uncertainty of about 2% for the Seebeck coefficient can be shown under utilization of an improved measurement system. The enhancement of the measuring system will be achieved by using gold/platinum thermocouples and a Pt-100 thermometer.

[1] http://www.empronline.eu/energycall/index.html