Structure and dielectric properties of La-doped lead strontium titanate thin films derived from sol-gel method

摘要

A series of (Pb0.4Sr0.6)(1-x)La2x/3TiO3 (PSLT) thin films were deposited on ITO/glass substrates by sol-gel technique. Their phase status, surface morphology, and dielectric properties were studied by X-ray diffraction, scanning electron microscope, and impedance analyzer, respectively. Results show that the PSLT thin films were consisted of tetragonal perovskite phase PSLT thin films for x < 0.4, and cubic perovskite phase PSLT thin films for x > 0.4. Dielectric properties such as dielectric constants, dielectric tunabilitis, and inharmonic coeffcient were characterized as a function of the film composition.