Article ID Journal Published Year Pages File Type
8033795 Thin Solid Films 2016 7 Pages PDF
Abstract
The relaxor ferroelectric 0.8Pb(Zn1/3Nb2/3)O3-0.2PbTiO3 (0.8PZN-0.2PT) films have been fabricated on (100) SrTiO3 substrates by the sol-gel method. The structure, optical properties and electronic transitions have been investigated using X-ray diffraction (XRD), atomic force microscopy, scanning electron microscopy and ellipsometric spectra. The pure perovskite phase with highly a-axis (100)-preferential orientation as well as low screw dislocation are extracted based on high resolution XRD. Moreover, the red-shift trend of the electronic transitions at about 3.01 eV as a function of temperature follows the Bose-Einstein law induced by the electron-phonon interactions and lattice thermal expansion. Interestingly, the different optical behavior and structure variation can be observed at about 500 K, which reveal tetragonal to cubic structural transformations for the 0.8PZN-0.2PT films. It indicates that the potential application of ellipsometric spectra in judging the phase transitions and symmetries of ferroelectric material.
Related Topics
Physical Sciences and Engineering Materials Science Nanotechnology
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