Diffusion of Li, Na and K in fluorinated Ti dioxide films: Applicability of the Anderson-Stuart Model
1997 (English)In: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 81, 2167-2172 p.Article in journal (Refereed) Published
Fluorinated Ti dioxide films were made by reactive sputtering. The mobility of Li, Na, and K in this host was studied by electrochemical techniques. Chronopotentiometry suggested that the cations occupy one type of site for cation/Ti ratios below 0.5, and that other sites are populated at higher ratios. Li and Na intercalation appeared to progress without major structural changes, whereas the intercalation of the larger K ions caused structural rearrangement. Impedance spectra were interpreted within a Randles circuit with a finite length Warburg element from which chemical diffusion coefficients were obtained at different intercalation levels and temperatures. The ion diffusion could be understood in detail from the classical Anderson–Stuart model [O. L. Anderson and D. A. Stuart, J. Am. Ceram. Soc. 37, 573 (1954)] as long as the structure remained unchanged, i.e., for the Li and Na intercalation, whereas K intercalation, expectedly, could not be reconciled with this model.
Place, publisher, year, edition, pages
1997. Vol. 81, 2167-2172 p.
Engineering and Technology
IdentifiersURN: urn:nbn:se:uu:diva-30206DOI: 10.1063/1.364232OAI: oai:DiVA.org:uu-30206DiVA: diva2:58102