Stability and oxygen ionic conductivity of zircon-type Ce(1-x)A(x)VO(4+delta) (A = Ca, Sr)
authors Tsipis, EV; Kharton, VV; Vyshatko, NP; Shaula, AL; Frade, JR
nationality International
journal JOURNAL OF SOLID STATE CHEMISTRY
author keywords cerium vanadate; zircon; stability; phase decomposition; transference number; faradaic efficiency; conductivity; seebeck coefficient; thermal expansion
keywords ELECTRONIC TRANSPORT; SOLID-SOLUTIONS; FUEL-CELLS; OXIDES; STATE; CEVO4; PR; CE
abstract Zircon-type Ce(1-x)A(x)VO(4+delta) (A= Ca, Sr; x = 0-0.2) are stable in air up to approximately 1300 K, whilst further heating or reducing oxygen partial pressure leads to formation of A-site deficient zircon and CeO2-delta phases. The stability boundaries of Ce(1-x)A(x)VO(4+delta) are comparable to those of vanadium dioxide and calcium orthovanadate. At oxygen pressures lower than 10(-15) atm, perovskite-type CeVO3-delta is formed. The oxygen ion transference numbers of Ce(1-x)A(x)VO(4+delta), determined by faradaic efficiency measurements in air, vary in the range from 2 x 10(-4) to 6 x 10(-3) at 973-1223 K, increasing with temperature. The oxygen ionic conductivity has activation energy of 87-112 kJ/mol and is essentially independent of A-site dopant content. Contrary to the ionic transport, p-type electronic conductivity and Seebeck coefficient of Ce(1-x)A(x)VO(4+delta) are influenced by the divalent cation concentration. The average thermal expansion coefficients of Ce(1-x)A(x)VO(4+delta), calculated from high-temperature XRD and dilatometric data in air, are (4.7-6.1) x 10(-6) K-1. (C) 2003 Elsevier Inc. All rights reserved.
publisher ACADEMIC PRESS INC ELSEVIER SCIENCE
issn 0022-4596
year published 2003
volume 176
issue 1
beginning page 47
ending page 56
digital object identifier (doi) 10.1016/S0022-4596(03)00342-6
web of science category Chemistry, Inorganic & Nuclear; Chemistry, Physical
subject category Chemistry
unique article identifier WOS:000186711300008
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