Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 31, Issue 15, Pages 2957-2963Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2011.07.006
Keywords
Nanocomposites; ZnO; Electrical conductivity; Thermal conductivity; Thermoelectric
Categories
Funding
- CNRS
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Zn1-xNixO dense ceramics were prepared from Zn1-xNixO nanoparticles with x varying from 0 to 0.06. These nanoparticles were synthesized by liquid route. In the sintered samples, the solubility limit of Ni in the Zn1-xNixO wurtzite structure was found to be 0.03. The increase of x until 0.03 led to a significant raise in both electrical conductivity (sigma) and absolute value of Seebeck coefficient (vertical bar S vertical bar). Ni-richer samples (x > 0.03) contained in addition a small amount of Ni rich secondary phase (ZnyNizO) with a cubic structure similar to NiO. The thermoelectric properties of all samples were investigated from room temperature to 1000K. All doped samples showed a n-type semiconducting conductivity. For Ni contents higher than x = 0.03, the increase of the secondary phase content induced a decrease in sigma and vertical bar S vertical bar. The highest power factor (0.6 mW m(-1) K-2) and ZT (0.09) were found for Zn0.97Ni0.03O at 1000 K. (C) 2011 Elsevier Ltd. All rights reserved.
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