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Title: International Round-Robin Testing of Bulk Thermoelectrics

Abstract

Two international round-robin studies were conducted on transport properties measurements of bulk thermoelectric materials. The study discovered current measurement problems. In order to get ZT of a material four separate transport measurements must be taken. The round-robin study showed that among the four properties Seebeck coefficient is the one can be measured consistently. Electrical resistivity has +4-9% scatter. Thermal diffusivity has similar +5-10% scatter. The reliability of the above three properties can be improved by standardizing test procedures and enforcing system calibrations. The worst problem was found in specific heat measurements using DSC. The probability of making measurement error is great due to the fact three separate runs must be taken to determine Cp and the baseline shift is always an issue for commercial DSC. It is suggest the Dulong Petit limit be always used as a guide line for Cp. Procedures have been developed to eliminate operator and system errors. The IEA-AMT annex is developing standard procedures for transport properties testing.

Authors:
 [1];  [1];  [2];  [2];  [3];  [3];  [4];  [5];  [5];  [6];  [7];  [8];  [9];  [10]
  1. ORNL
  2. Fraunhofer-Institute, Freiburg, Germany
  3. Chinese Academy of Sciences
  4. Clemson University
  5. Corning, Inc
  6. ZT-Plus
  7. Marlow Industries, Inc
  8. CANMET - Materials Technology Laboratory, Natural Resources of Canada
  9. University of Waterloo, Canada
  10. University of Quebec at Chicoutimi
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); High Temperature Materials Laboratory
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
1049790
Report Number(s):
ORNL/TM-2011/393
VT0504000; CEVT004; TRN: US201218%%609
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ELECTRIC CONDUCTIVITY; PROBABILITY; RELIABILITY; SPECIFIC HEAT; TESTING; THERMAL DIFFUSIVITY; THERMOELECTRIC MATERIALS; TRANSPORT; thermoelectric; round-robin

Citation Formats

Wang, Hsin, Porter, Wallace D, Bottner, Harold, Konig, Jan, Chen, Lidong, Bai, Shengqiang, Tritt, Terry M., Mayolett, Alex, Smith, Charlene, Harris, Fred, Sharp, Jeff, Lo, Jason, Keinke, Holger, and Kiss, Laszlo I. International Round-Robin Testing of Bulk Thermoelectrics. United States: N. p., 2011. Web. doi:10.2172/1049790.
Wang, Hsin, Porter, Wallace D, Bottner, Harold, Konig, Jan, Chen, Lidong, Bai, Shengqiang, Tritt, Terry M., Mayolett, Alex, Smith, Charlene, Harris, Fred, Sharp, Jeff, Lo, Jason, Keinke, Holger, & Kiss, Laszlo I. International Round-Robin Testing of Bulk Thermoelectrics. United States. doi:10.2172/1049790.
Wang, Hsin, Porter, Wallace D, Bottner, Harold, Konig, Jan, Chen, Lidong, Bai, Shengqiang, Tritt, Terry M., Mayolett, Alex, Smith, Charlene, Harris, Fred, Sharp, Jeff, Lo, Jason, Keinke, Holger, and Kiss, Laszlo I. Tue . "International Round-Robin Testing of Bulk Thermoelectrics". United States. doi:10.2172/1049790. https://www.osti.gov/servlets/purl/1049790.
@article{osti_1049790,
title = {International Round-Robin Testing of Bulk Thermoelectrics},
author = {Wang, Hsin and Porter, Wallace D and Bottner, Harold and Konig, Jan and Chen, Lidong and Bai, Shengqiang and Tritt, Terry M. and Mayolett, Alex and Smith, Charlene and Harris, Fred and Sharp, Jeff and Lo, Jason and Keinke, Holger and Kiss, Laszlo I.},
abstractNote = {Two international round-robin studies were conducted on transport properties measurements of bulk thermoelectric materials. The study discovered current measurement problems. In order to get ZT of a material four separate transport measurements must be taken. The round-robin study showed that among the four properties Seebeck coefficient is the one can be measured consistently. Electrical resistivity has +4-9% scatter. Thermal diffusivity has similar +5-10% scatter. The reliability of the above three properties can be improved by standardizing test procedures and enforcing system calibrations. The worst problem was found in specific heat measurements using DSC. The probability of making measurement error is great due to the fact three separate runs must be taken to determine Cp and the baseline shift is always an issue for commercial DSC. It is suggest the Dulong Petit limit be always used as a guide line for Cp. Procedures have been developed to eliminate operator and system errors. The IEA-AMT annex is developing standard procedures for transport properties testing.},
doi = {10.2172/1049790},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2011},
month = {11}
}

Technical Report:

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