Electrical conductivity and defect disorder of tantalum-doped TiO2

Alim, M, Bak, T, Atanacio, A, Du Plessis, J, Zhou, M, Davis, J and Nowotny, J 2017, 'Electrical conductivity and defect disorder of tantalum-doped TiO2', Journal of the American Ceramic Society, vol. 100, no. 9, pp. 4088-4100.


Document type: Journal Article
Collection: Journal Articles

Title Electrical conductivity and defect disorder of tantalum-doped TiO2
Author(s) Alim, M
Bak, T
Atanacio, A
Du Plessis, J
Zhou, M
Davis, J
Nowotny, J
Year 2017
Journal name Journal of the American Ceramic Society
Volume number 100
Issue number 9
Start page 4088
End page 4100
Total pages 13
Publisher Wiley-Blackwell Publishing
Abstract The present work reports the electrical properties of polycrystalline Ta-doped TiO 2 (0.39 at.% Ta) determined in situ at elevated temperatures (1173-1323 K) in the gas phase of controlled oxygen activity (10 -12 Pa to 10 5 Pa). The effect of oxygen activity on the electrical conductivity and thermoelectric power of TiO 2 is discussed in terms of defect disorder, including (1) the intrinsic electronic disorder that is governed by electronic compensation in the strongly reducing regime, (2) the extrinsic electronic disorder that is governed by electronic charge compensation in the reducing regime, and (3) the extrinsic ionic disorder that is governed by ionic compensation in the oxidizing regime. It is shown that tantalum ions are incorporated into the titanium sublattice of TiO 2 leading to the formation of donor-type energy levels. The Arrhenius-type plot of the electrical conductivity data leads to the determination of the formation enthalpy terms. The obtained results are considered in terms of the effect of tantalum and oxygen activity on the defect disorder and the associated key performance-related properties in the light-induced partial water oxidation.
Subject Materials Engineering not elsewhere classified
Keyword(s) electrical properties
oxides
Point defects
titanium dioxide
DOI - identifier 10.1111/jace.14959
Copyright notice © 2017 The American Ceramic Society
ISSN 0002-7820
Versions
Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 4 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 0 times in Scopus Article
Altmetric details:
Access Statistics: 7 Abstract Views  -  Detailed Statistics
Created: Thu, 31 Jan 2019, 11:26:00 EST by Catalyst Administrator
© 2014 RMIT Research Repository • Powered by Fez SoftwareContact us