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Size Effect and Domain Contribution in Barium Titanate
Keywords: dielectrics, barium titanate, polarization
Barium titanate ceramics with various grain sizes were prepared by a conventional sintering method and a two-step sintering method. The dielectric permittivity of the ceramics increased with decreasing grain size. Barium Titanate ceramics with an average grain size of 1 um had a high permittivity of 7,700. The transmission electron microscopy observation revealed that the 90 domain density increased with decreasing grain size. The domain size of the ceramics with the highest permittivity was approximately 100 nm. Ultra wide range dielectric spectroscopy from kHz to THz revealed that the permittivity was mainly enhanced by the dipole polarization due to domain-wall vibration but the enhancement of ionic polarization was also observed with increasing domain density. The piezoelectric properties increased with decreasing grain size and the d33 value reached 450 pC/N at 1 um grain size. The change of piezoelectric property with domain size could be interpreted by softening of crystal lattices at the domain walls.
Takaaki Tsurumi, Professor
Tokyo Institute of Technology
Meguro, Tokyo 152-8552,
Japan


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