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Piezoelectric and Dielectric Enhancement of New Nano-structured Ceramics with Heteroepitaxial Interfaces
Keywords: heteroepitaxial interface, dielectric enhancement, piezoelectric enhancement
Barium titanate (BaTiO3, BT) and potassium niobate (KNbO3, KN) (BT-KN) nano-structured ceramics with artificial morphotropic phase boundary (MPB) structure were successfully prepared by solvothermal method at temperatures below 230 ˚C. Various characterizations confirmed that the BT-KN nano-structured ceramics exhibited BT/KN molar ratio of 1, a porosity of around 30 % and heteroepitaxial interface between BT and KN. Their apparent piezoelectric constant d33* was estimated at 136 pC/N, and was three times larger value than that of the 0.5BT-0.5KN dense ceramics. The concept proposed in this study can be a new way to create piezoelectric ceramics with artificial MPB region. Moreover, this method is very universal and applied into various functional materials such as magnetic, conductive, semi-conductive, and optical materials in addition to dielectric, piezoelectric and ferroelectric materials. In the future, we will develop various new materials with heteroepitaxial interfaces on the basis of the concept.
Satoshi Wada, Ptofessor
University of Yamanashi
Kofu, Yaamanashi

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