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Oxygen stoichiometry and transport properties of cerium niobate

Vullum, Fride; Grande, Tor
Journal article, Peer reviewed
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CeNbO4-paper_revised 121007-TG(siste utkast).doc (592.5Kb)
URI
http://hdl.handle.net/11250/2389496
Date
2008
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  • Institutt for materialteknologi [1612]
  • Publikasjoner fra CRIStin - NTNU [21058]
Original version
Solid State Ionics 2008, 179(21-26):1061-1065   10.1016/j.ssi.2007.12.079
Abstract
CeNbO4 + δ has been synthesized by both solid state and wet chemical routes and characterized with respect to electrical conductivity and oxygen stoichiometry between 900 °C and 1100 °C and pO2 from 1 bar to 0.002 bar. CeNbO4 + δ was shown to exhibit mixed conductivity with oxygen interstitials and electron holes being the major charge carriers. The activation energies for chemical diffusion (Dchem) and surface exchange coefficient (kchem), determined by electrical relaxation measurements, were 55.8 ± 3.7 and 198 ± 20 kJ/mol, respectively. Finally, both Dchem and kchem were reduced with decreasing partial pressure of oxygen.
Publisher
Elsevier
Journal
Solid State Ionics

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