90° a-b domains in epitaxial ferroelectric Bi3.25La 0.75Ti3O12 films
Journal
Applied Physics Letters
Journal Volume
85
Journal Issue
11
Pages
2029-2031
Date Issued
2004
Author(s)
Abstract
A cross-sectional high-resolution electron microscopy study was performed on (010)∕(100)-oriented ferroelectric Bi3.25La0.75Ti3O12 (BLT) films. Using Bragg filtering, curved, irregular, and nanoscale 90° domain configurations were observed. The weak ferroelastic strain of 0.024% suggests a negligible polarization clamping of 90°a–b domains under bipolar electric field and an easy 90° switching of the polar a axis in the ab plane. In addition, antiphase boundaries were characterized. A negligible contribution of 90°a–b domains to the fatigue of BLT is proposed.
Type
journal article