Journal
SOLID STATE IONICS
Volume 180, Issue 4-5, Pages 326-337Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ssi.2009.01.001
Keywords
Electrical conductivity relaxation; Chemical diffusion; Oxidation; Hydration; Mixed conductor oxides; Internal equilibrium
Categories
Funding
- Ministry of Knowledge Economy (MKE), Republic of Korea
Ask authors/readers for more resources
Chemical diffusivity of a mixed ionic-electronic conductor compound is often measured by monitoring the relaxation of electrical conductivity with time under a component's chemical potential gradient. Conductivity relaxations were systematically examined on undoped polycrystal BaTiO(3), acceptor-doped polycrystal BaTiO(3), donor-doped polycrystal BaTiO(3), and undoped single crystal TiO(2) upon oxidation and reduction, and on proton-conducting, acceptor-doped polycrystal SrCeO(3) and BaCeO(3) upon oxidation/reduction or hydration/dehydration at elevated temperatures. It has been found that there are three patterns of relaxation: single-fold (single relaxation time) monotonic, twofold (two relaxation times) monotonic and twofold non-monotonic relaxation. The inner working for each pattern is discussed and a general solution to the relaxations is presented in closed form, together with the chemical diffusivities as evaluated thereby. (C) 2009 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available