INFLUENCE OF 180-DEGREES DOMAINS ON FERROELECTRIC PROPERTIES OF BATIO3 SINGLE-CRYSTAL

Mechanical poling was applied to a BaTiO3 single crystal grown by the top-seeded solution growth (TSSG) method to remove its 90-degrees domain walls, and then four-step electrical poling was applied to rearrange the 180-degrees domain configuration. In each of these steps, the dielectric constant (from 50 kHz to 10 MHz) was measured by using an impedance analyzer, and the 180-degrees domains were observed by the etching method. The dielectric spectra were confirmed to vary with rearrangement in 180-degrees domain configuration. Dielectric constant epsilon(c) in the [001] direction was 130 at 100 kHz and 58 at 10 MHz. Dielectric constant epsilon(a) in the [100] direction was 4700 at 100 kHz and 1900 at 10 MHz.