Mixed conductivity of zircon-type Ce(1-x)A(x)VO(4 +/-delta) (A = Ca, Sr)
authors Tsipis, EV; Kharton, VV; Vyshatko, NP; Shaula, AL; Patrakeev, MV; Frade, JR
nationality International
journal IONICS
abstract Incorporation of alkaline-earth cations into the zircon-type lattice of Ce(1-x)A(x)VO(4+delta) (A = Ca, Sr; x = 0 - 0.2) was found to significantly increase the p-type electronic conductivity and to decrease the Seebeck coefficient, which becomes negative at x greater than or equal to 0.1. The oxygen ionic conductivity is essentially unaffected by doping. The ion transference numbers of Ce(1-x)A(x)VO(4+delta) in air, determined by the faradaic efficiency measurements, are in the range from 2 x 10(-4) to 6 x 10(-3) at 973-1223 K, increasing when temperature increases or alkaline-earth cation content decreases. The results on the partial conductivities and Seebeck coefficient suggest the presence of hyperstoichiometric oxygen, responsible for ionic transport, in the lattice of doped cerium vanadates. The activation energies for the electron-hole and ionic conduction both decrease on doping and vary in the ranges 39-45 kJ/mol and 87-112 kJ/mol, respectively.
publisher INST IONICS
issn 0947-7047
year published 2003
volume 9
issue 3-4
beginning page 231
ending page 237
digital object identifier (doi) 10.1007/BF02375972
web of science category Chemistry, Physical; Electrochemistry; Physics, Condensed Matter
subject category Chemistry; Electrochemistry; Physics
unique article identifier WOS:000187528200012
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