Mixed conductivity of zircon-type Ce(1-x)A(x)VO(4 +/-delta) (A = Ca, Sr)


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.



subject category

Chemistry; Electrochemistry; Physics


Tsipis, EV; Kharton, VV; Vyshatko, NP; Shaula, AL; Patrakeev, MV; Frade, JR

our authors

Share this project:

Related Publications

We use cookies for marketing activities and to offer you a better experience. By clicking “Accept Cookies” you agree with our cookie policy. Read about how we use cookies by clicking "Privacy and Cookie Policy".