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Fergusonite-type CeNbO4+δ: Single crystal growth, symmetry revision and conductivity

Lookup NU author(s): Dr Stevin Pramana

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Abstract

Large fergusonite-type (ABO4, A=Ce, B=Nb) oxide crystals, a prototype electrolyte composition for solid oxide fuel cells (SOFC), were prepared for the first time in a floating zone mirror furnace under air or argon atmospheres. While CeNbO4 grown in air contained CeNbO 4.08 as a minor impurity that compromised structural analysis, the argon atmosphere yielded a single phase crystal of monoclinic CeNbO4, as confirmed by selected area electron diffraction, powder and single crystal X-ray diffraction. The structure was determined in the standard space group setting C12/c1 (No. 15), rather than the commonly adopted I12/a1. AC impedance spectroscopy conducted under argon found that stoichiometric CeNbO4 single crystals showed lower conductivity compared to CeNbO4+δ confirming interstitial oxygen can penetrate through fergusonite and is responsible for the higher conductivity associated with these oxides. © 2013 Elsevier Inc.


Publication metadata

Author(s): Bayliss RD, Pramana SS, An T, Wei F, Kloc CL, White AJP, Skinner SJ, White TJ, Baikie T

Publication type: Article

Publication status: Published

Journal: Journal of Solid State Chemistry

Year: 2013

Volume: 204

Pages: 291-297

Print publication date: 01/08/2013

Online publication date: 25/06/2013

ISSN (print): 0022-4596

ISSN (electronic): 1095-726X

Publisher: Academic Press

URL: http://dx.doi.org/10.1016/j.jssc.2013.06.022

DOI: 10.1016/j.jssc.2013.06.022


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