H. Funakubo, S. Yasui, K. Yazawa, J. Nagata, T. Oikawa, T. Yamada, H. Uchida
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Abstract
We developed the piezoelectric materials not including Pb, Li, K and Na as constituent elements. Our concern is the composition survey of the morphotropic phase boundary between tetragonal and non-tetragonal ferroelectric materials. In this approach, we must select the tetragonal ferroelectrics other than PbTiO3 and (Bi1/2K1/2)TiO3 as a end material. BiCoO3 and Bi(Zn1/2Ti1/2)O3 are novel tetragonal candidates for this purpose. We successfully grew epitaxial tetragonal films having ferroelectricity in BiCoO3-BiFeO3 and Bi(Zn1/2Ti1/2)O3-BiFeO3 systems. Based on these system, composition having maximum piezoelectric response of d33(AFM) = 280 pm/V was discovered for epitaxial films in Bi(Zn1/2Ti1/2)O3-Bi(Mg1/2Ti1/2)O3-BiFeO3 system.
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