Study of Ferroelectric Bi_3.25La_0.75Ti₃O₁₂ Thin Films Deposited by Sol-Gel Method

Abstract

Powders and thin films of ferroelectric Bi_3.25La_0.75Ti₃O₁₂ (BLT) have been prepared from a sol-gel precursor heated at various temperatures, up to 600°C. The BLT precursor and the BLT powders have been characterized by thermal analyses, X-ray diffraction (XRD), scanning and transmission electron microscopy (SEM and TEM). Then, the precursor has been used to deposit thin films of ferroelectric BLT on specific silicon substrates, using a specific spin coating process. The thin films have been characterized by XRD, SEM and ellipsometry. Electrical polarization analyses have been finally performed on these films, and performing remnant polarization has been obtained.

Keywords:

• Ferroelectric film
• sol-gel synthesis
• spin-coating process
• remnant polarization

Acknowledgments

This work was supported by PHI VOLUBILIS action MA/07/165, and by Marie Curie FP7-IRSES-ROBOCON mobility program