Ferroelectric SrBi2Ta2O9 thin films were prepared from Sr metals, Ta-ethoxide and Bi, 2-ethylhexanoate. The films were prepared from both stoichiometric and 10 mol% Bi rich solutions. The stoichiometric film crystallized at 800°C had a spontaneous polarization value of 5 μC/cm2. The Bi rich film had lower crystallinity, finer grains and a smaller polarization. It was found to be necessary to anneal the films at high temperatures or for long time to achieve ferroelectricity. The non-crystalline states of sol-gel derived films differ from that observed in films deposited by physical vapor deposition. Crack free films were produced with the film thicknesses of 0.4 μm.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics