caa a22 4500 475815254 CHVBK 20180406123808.0 cr unu---uuuuu 170329e20001201xx s 000 0 eng 10.1023/A:1026585124816 doi (NATIONALLICENCE)springer-10.1023/A:1026585124816 Electrical conductivity and chemical diffusivity of NiAl2O4 spinel under internal reforming fuel cell conditions [Elektronische Daten] [L. Kou, J.R. Selman] NiAl2O4 spinel was formed by solid state reaction. Its electrical conductivity was measured in the temperature range of 680-940 °C and under various oxygen-rich environments, as well as under reducing conditions. From the temperature dependence of the conductivity, the activation energies for conduction increase for decreasing oxygen partial pressures. From the partial oxygen pressure dependence, the defect structure of the material was analysed. The conductivity change with respect to P O2 can be attributed to singly and doubly ionized nickel vacancies. The chemical diffusivity of the oxide was determined by conductivity relaxation upon abrupt change in P O2 in the surrounding atmosphere. The oxygen chemical diffusion coefficient is of the order of magnitude of 10−4 cm2 s−1. Kluwer Academic Publishers, 2000 chemical diffusion coefficient nationallicence conductivity relaxation method nationallicence electrical conductivity nationallicence NiAl2O4 nationallicence van der Pauw four-point method nationallicence Kou L. Department of Chemical and Environmental Engineering, Illinois Institute of Technology, 10 W. 33rd St., 60616, Chicago, IL, USA aut Selman J.R. Department of Chemical and Environmental Engineering, Illinois Institute of Technology, 10 W. 33rd St., 60616, Chicago, IL, USA aut Journal of Applied Electrochemistry Kluwer Academic Publishers 30/12(2000-12-01), 1433-1437 0021-891X 30:12<1433 2000 30 10800 https://doi.org/10.1023/A:1026585124816 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1023/A:1026585124816 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Kou L. Department of Chemical and Environmental Engineering, Illinois Institute of Technology, 10 W. 33rd St., 60616, Chicago, IL, USA aut NATIONALLICENCE 700 1- Selman J.R. Department of Chemical and Environmental Engineering, Illinois Institute of Technology, 10 W. 33rd St., 60616, Chicago, IL, USA aut NATIONALLICENCE 773 0- Journal of Applied Electrochemistry Kluwer Academic Publishers 30/12(2000-12-01), 1433-1437 0021-891X 30:12<1433 2000 30 10800 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer