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Properties of Compositionally Graded BiScO 3 –PbTiO 3 Thin Films Fabricated by a Sol–Gel Process
Author(s) -
Wen Hai,
Wang Xiaohui,
Zhong Caifu,
Shu Like,
Li Longtu
Publication year - 2007
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2007.01772.x
Subject(s) - materials science , thin film , dielectric , ferroelectricity , composite material , phase boundary , microstructure , sol gel , dielectric loss , phase (matter) , analytical chemistry (journal) , mineralogy , optoelectronics , nanotechnology , chemistry , organic chemistry , chromatography
The compositionally graded BiScO 3 –PbTiO 3 (BSPT) thin films were fabricated on Pt/Ti/SiO 2 /Si by a sol–gel method. For the up‐graded thin film, the PbTiO 3 content increased from the film–substrate interface to the surface of the film, while the down‐grade thin film showed the opposite trend. The graded thin films exhibited single‐phase structures and dense microstructures. The dielectric and ferroelectric properties of the thin films were investigated. The results showed that the compositionally graded BSPT thin films had similar remanent polarization value but a higher dielectric constant, dielectric tunability, and piezoelectric coefficient d 33 compared with the homogeneous thin film with a composition of 0.36BiScO 3 –0.64PbTiO 3 at the morphotropic phase boundary.