Study of relaxor-like behaviour of laser ablated (Pb, La)Tio3 thin films

✍ Scribed by P. Venkateswarlu; A. Laha; S.B. Krupanidhi

• Publisher: Elsevier Science
• Year: 2003
• Tongue: English
• Weight: 140 KB
• Volume: 127
• Category: Article
• ISSN: 0038-1098
• DOI: 10.1016/s0038-1098(03)00390-9

✦ Synopsis

Lanthanum modified lead titanate (PLT) thin films are one of the potential candidates for the pyroelectric and memory applications due to their excellent dielectric, pyroelectric and ferroelectric properties. PLT thin films with 25 at.% of La were deposited on platinum coated Si substrates by the laser ablation technique. The phase transition studies were done in the temperature range of 2 40 to 150 8C as a function of frequency and ac field. A diffused phase transition with the shifting of the maximum dielectric permittivity ðe max Þ to higher temperatures with the increase of frequency and dielectric dispersion with frequency at the lower temperatures were observed. The variation of the temperature corresponding to maximum dielectric constant T m ; with frequency follows the Vogel -Fulcher relation, which is the characteristic of the relaxor-like behavior of the material. With the increase of ac drive, the T max was shifted to lower value.