Ferroelectric and dielectric anisotropy in high-quality SrBi2Ta2O9 single crystals

Amorín, H.; Shvartsman, V. V.; Kholkin, A. L.; Costa, M. E. V.
December 2004
Applied Physics Letters;12/6/2004, Vol. 85 Issue 23, p5667
Academic Journal
High-quality SrBi2Ta2O9 single crystals were obtained by a self-flux solution method. The crystals were naturally oriented with [001] direction perpendicular to the major face and edges parallel to [110] axes. The dielectric and ferroelectric properties of the crystals were investigated along the c axis and in the ab plane of the orthorhombic unit cell. The ferro–paraelectric phase transition was observed at TC=355 °C. The anisotropy of dielectric permittivity, i.e., the ratio between average permittivity in the ab plane and along c axis was about 10 at TC and decreased to ∼2 at room temperature. Saturated hysteresis loops were observed for switching in the ab plane. The spontaneous polarization along ferroelectric a axis was estimated to be ≈20 μC/cm2.


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