Strain-driven control of piezoelectricity in (Na,Bi)TiO3-BaTiO3 epitaxial thin films

Tanaka, Y.; Harigai, T.; Adachi, H.; Sakamoto, N.; Wakiya, N.; Suzuki, H.; Fujii, E.
May 2013
Applied Physics Letters;5/13/2013, Vol. 102 Issue 19, p192901
Academic Journal
Thermal strain effect on the piezoelectricity was investigated for (Na,Bi)TiO3-BaTiO3 (NBT-BT) thin films on various substrates with (100) and (110) orientations. The compressive-thermal strain caused an increase in the remnant polarization unaccompanied by a decrease in dielectric permittivity, which resulted in enhancement of the piezoelectric coefficient, e*31. For films on (110) substrates, the crystal lattices were distorted to orthorhombic symmetry under both the tensile- and compressive-strains and the in-plane anisotropy of piezoelectricity emerged with e*31 as large as -19 to -20.6 C/m2. We conclude that the large piezoelectricity in NBT-BT films on (110) substrates is related to the appearance of orthorhombic phase.


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