Ferroelectric thin films of Bi4Ti3O12were fabricated on several types of substrates, including quartz, steel plates, and indium‐tin‐oxide coated glass slides, by sol‐gel technique. Crystalline, transparent, and crack‐free films of 5000 A˚ thickness were fabricated by spinning and post‐deposition annealing at a temperature of 550 °C. Ferroelectric properties were confirmed byP‐Ehysteresis loops. The dielectric constant and optical transmission were also measured.