It was noted that LiNbO3 thin films, deposited by electron-gun evaporation,

exhibited a lithium deficiency which could be cured by Li-doping. The Li doping

of the films was achieved by preparing a structure of Li-Nb-O/Li/Li-Nb-O, which,

after annealing, formed an homogenized LiNbO3 layer because of the diffusion of

Li into the two Li-Nb-O layers. The LiCoO2/LiNbO3 bi-layers were prepared either

on stainless-steel/TiN or on Al2O3/Co/Pt substrates/ohmic-contacts by depositing

either first the cathode, LiCoO2, or the electrolyte, LiNbO3. The Nyquist plots of

the AC impedance measurements of all of the structures showed that the interfaces

prepared onto stainless-steel/TiN consisted of two semicircles. The structures

deposited onto Al2O3/Co/Pt exhibited a third semicircle, which was probably due to

the roughness of the substrate. It was important that the ionic properties of the bilayers

with the cathode material deposited first were improved, compared to the

other structures. The quality of the LiNbO3 layer depended very much upon the

substrate. It could be deduced from Arrhenius plots that the activation energy of

this layer was considerably lower when the whole structure was deposited onto

stainless-steel/TiN.

Influence of Different Substrates on the Ionic Conduction in LiCoO2/LiNbO3 Thin-

Film Bi-Layers. E.E.Horopanitis, G.Perentzis, L.Papadimitriou: Physica Status

Solidi C, 2008, 5[12], 3763-6