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Title: Thermoelectric properties of Zintl compound Ca 1-xNa xMg 2Bi 1.98

Motivated by good thermoelectric performance of Bi-based Zintl compounds Ca 1-xYb xMg 2Bi y, we further studied the thermoelectric properties of Zintl compound CaMg 2Bi 1.98 by doping Na into Ca as Ca 1-xNa xMg 2Bi 1.98 via mechanical alloying and hot pressing. We found that the electrical conductivity, Seebeck coefficient, power factor, and carrier concentration can be effectively adjusted by tuning the Na concentration. Transport measurement and calculations revealed that an optimal doping of 0.5 at.% Na achieved better average ZT and efficiency. The enhancement in thermoelectric performance is attributed to the increased carrier concentration and power factor. Finally, the low cost and nontoxicity of Ca 1-xNa xMg 2Bi 1.98 makes it a potentially promising thermoelectric material for power generation in the mid-temperature range.
Authors:
 [1] ;  [1] ;  [2] ;  [1] ;  [3] ;  [1]
  1. Univ. of Houston, Houston, TX (United States). Dept. of Physics and TcSUH
  2. Univ. of Houston, Houston, TX (United States). Dept. of Physics and TcSUH; Harbin Inst. of Technology, Harbin, Heilongjiang (China). National Key Lab. for Precision Hot Processing of Metals and School of Materials Science and Engineering
  3. Harbin Inst. of Technology, Harbin, Heilongjiang (China). National Key Lab. for Precision Hot Processing of Metals and School of Materials Science and Engineering
Publication Date:
Grant/Contract Number:
SC0010831; FG02-13ER46917
Type:
Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 108; Journal Issue: 18; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)
Research Org:
Univ. of Houston, Houston, TX (United States)
Sponsoring Org:
USDOE Office of Science (SC); National Natural Science Foundation of China (NNSFC)
Country of Publication:
United States
Language:
English
Subject:
30 DIRECT ENERGY CONVERSION
OSTI Identifier:
1471077
Alternate Identifier(s):
OSTI ID: 1250586