Structural features and thermoelectric properties of Al-doped (ZnO)(5)In2O3 homologous phases

Kosir, Mateja and Ceh, Miran and Ow-Yang, Cleva W. and Gilmeau, Emmanuel and Bernik, Slavko (2017) Structural features and thermoelectric properties of Al-doped (ZnO)(5)In2O3 homologous phases. Journal of the American Ceramic Society, 100 (8). pp. 3712-3721. ISSN 0002-7820 (Print) 1551-2916 (Online)

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In this work, we investigated the influence of Al doping on the structure of the (ZnO)(5)In2O3 homologous phase and the thermoelectric characteristics of (ZnO)(5)(In1-xAlx)(2)O-3 ceramics for x=0, 0.01, 0.03, 0.05, 0.1, and 0.2, prepared using a classic ceramic procedure and sintering at 1500 degrees C for 2 hours. The Al substituted for In on both the primary sites in the Zn-5(In1-xAlx)(2)O-8 homologous phase, the octahedral sites in the basal-plane inversion boundaries and the trigonal bi-pyramidal sites in the zig-zag inversion boundaries, which resulted in a uniformly increased shrinkage of the unit cell with the additions of Al. The a and c parameters were reduced for x=0.2 by a maximum 0.8%. All the samples had similar microstructures, so the differences in the TE characteristics mainly resulted from the effects of the substitution of Al for In, decreasing the charge-carrier concentration and affecting their mobility. Slightly improved TE characteristics were only observed for Al additions with x=0.01-0.05, while larger additions of Al only resulted in a reduced electrical conductivity and decreased ZT values in comparison to the un-doped composition.
Item Type: Article
Uncontrolled Keywords: (ZnO)(5)In2O3; Al-doping; indium oxide; thermoelectric properties; zinc oxide
Subjects: Q Science > QD Chemistry
Q Science > QC Physics
Divisions: Sabancı University Nanotechnology Research and Application Center
Faculty of Engineering and Natural Sciences > Academic programs > Materials Science & Eng.
Faculty of Engineering and Natural Sciences
Depositing User: Cleva W. Ow-Yang
Date Deposited: 03 Aug 2018 10:33
Last Modified: 22 May 2019 14:04

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