Transport properties and structural stability of tetragonal CeNbO(4+delta)
authors Tsipis, EV; Munnings, CN; Kharton, VV; Skinner, SJ; Frade, JR
nationality International
journal SOLID STATE IONICS
author keywords cerium niobate; scheelite; oxygen ionic transport; ion transference number; mixed conductor
keywords IONIC-CONDUCTIVITY; OXYGEN; NIOBATES; PHASES; CA; SR
abstract The electrical properties of CeNbO(4+delta) have been investigated at 1073-1223 K in the oxygen partial pressure range 10(-17) to 0.36 atm. The conductivity and Seebeck coefficient behaviour indicates that, at oxygen chemical potentials close to atmospheric, tetragonal CeNbO(4+delta) possesses a mixed ionic and p-type electronic conductivity. The ion transference numbers under the p(O(2)) gradient of 0.93/0.21 atm, measured by the modified e.m.f. technique, are close to 0.4 decreasing in more reducing environments. The variations of partial ionic and electronic conductivities can be described in terms of the oxygen intercalation into the scheelite-type lattice, which results in increasing concentrations of both dominant charge carriers, oxygen interstitials and holes, when p(O(2)) increases. Reduction leads to p(O(2))-independent electrical properties, followed by a drastic decrease in the conductivity at oxygen pressures below 10(-15)-10(-9) atm due to a reversible transition into the monoclinic phase. Contrary to the zircon-type CeVO(4+delta), no traces of the parent binary oxides were detected in the reduced cerium niobate. (c) 2006 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE BV
issn 0167-2738
year published 2006
volume 177
issue 11-12
beginning page 1015
ending page 1020
digital object identifier (doi) 10.1016/j.ssi.2006.02.040
web of science category Chemistry, Physical; Physics, Condensed Matter
subject category Chemistry; Physics
unique article identifier WOS:000238328100007
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