Size Effect of Nano-grained Ferroelectric Ceramics Fabricated byAerosol Deposition Method

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We demonstrated the grain size effect on the dielectric properties of BaTiO3 based ceramics fabricated by a two-step sintering method and aerosol deposition method. In the case of pure BaTiO3 ceramics, the grain size effect, where the permittivity showed a maximum at around 1 μm, was interpreted as the superposition effect of domain-wall contributions and grain boundary effect. Moreover, the size effects of (Ba,Ca)TiO3 and Ba(Zr,Ti)O3 ceramics, which were expected to be next-generation dielectric materials, were also investigated.