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Nb-doped semiconductive SrTiO3 film and Bi and Nb co-added SrTiO3 film were grown on (001) MgO substrates by metal-organic chemical vapor deposition (MOCVD). The (001)-oriented SrTiO3 phase was grown epitaxially with cube-on-cube structure in relation to the MgO substrate. In the case of the Nb-doped SrTiO3 film, the film exhibited a semiconductive nature with a low electrical resistivity (0.11Ω·cm) that is three orders of magnitude lower than that in bulk SrTiO3 ceramics by adding a much higher Nb addition (1.6-3.5mol%). Most of the added Nb is thought to substitute for the Ti4+ as valence 4+, as suggested by the dependency of the cell volume change. In the case of Bi and Nb co-added SrTiO3 film, the lattice parameter was somewhat increased with the addition of Bi, but the amount of Bi was undetectable. The addition of Bi did not produce a thin film with nonlinear electrical resistivity. Introducing a SrO seed layer with -2nm thickness onto (001) MgO substrate produced weak nonlinear I-V (varistor) properties. It might be thought that the grain boundary between the two kinds of in-plane oriented grains, i.e., 45° rotating and cube-on-cube grains, acts as a barrier against varistor characteristics.

nihon seramikkusu kyoukai gakujyutsu rombunshi/nippon seramikkusu kyōkai gakujutsu rombunshi

Special Issue Ceramics Integration. Growth Behavior of Bi and Nb Co-Added-SrTiO3 Thin Film Exhibiting Varistor Characteristics by Metal-Organic Chemical Vapor Deposition.