title: Dielectric relaxation and pinning phenomenon of (Sr,Pb)TiO3 ceramics for dielectric tunable device application.
abstract: The behavior of ferroelectric domain under applied electric field is very sensitive to point defects, which can lead to high temperature dielectric relaxation behaviors. In this work, the phases, dielectric properties and ferroelectric switching behavior of strontium lead titanate ceramics were investigated. The structural characterization is confirmed by X-ray diffraction. The high dielectric tunability and high figure of merit of ceramics, especially Sr0.7Pb0.3TiO3 (SPT), imply that SPT ceramics are promising materials for tunable capacitor applications. Oxygen vacancies induced dielectric relaxation phenomenon is observed. Pinched shape hysteresis loops appeared in low temperature, low electric field or high frequency, whereas these pinched hysteresis loops also can become normal by rising temperature, enhancing electric field or lowering frequency. The pinning and depinning effect can be ascribed to the interaction between oxygen vacancies and domain switching. A qualitative model and a quantitative model are used to explain this phenomenon. Besides, polarization and oxygen treated experiment can exert an enormous influence on pinning effect and the machanisms are also discussed in this work.
authors.affiliation: School of Physics &Optoelectric Engineering, Guangdong University of Technology, Guangzhou Higher Education Mega Center, Guangzhou 510006, People's Republic of China.
authors.forename: Xian-Xiong
authors.initials: XX
authors.lastname: Huang
authors.affiliation: School of Physics &Optoelectric Engineering, Guangdong University of Technology, Guangzhou Higher Education Mega Center, Guangzhou 510006, People's Republic of China.
authors.forename: Tian-Fu
authors.initials: TF
authors.lastname: Zhang
authors.affiliation: School of Physics &Optoelectric Engineering, Guangdong University of Technology, Guangzhou Higher Education Mega Center, Guangzhou 510006, People's Republic of China.
authors.forename: Xin-Gui
authors.initials: XG
authors.lastname: Tang
authors.affiliation: School of Physics &Optoelectric Engineering, Guangdong University of Technology, Guangzhou Higher Education Mega Center, Guangzhou 510006, People's Republic of China.
authors.forename: Yan-Ping
authors.initials: YP
authors.lastname: Jiang
authors.affiliation: School of Physics &Optoelectric Engineering, Guangdong University of Technology, Guangzhou Higher Education Mega Center, Guangzhou 510006, People's Republic of China.
authors.forename: Qiu-Xiang
authors.initials: QX
authors.lastname: Liu
authors.affiliation: School of Physics &Optoelectric Engineering, Guangdong University of Technology, Guangzhou Higher Education Mega Center, Guangzhou 510006, People's Republic of China.
authors.forename: Zu-Yong
authors.initials: ZY
authors.lastname: Feng
authors.affiliation: NIH Transducer Resource Center and Department of Biomedical Engineering, University of Southern California, Los Angeles 90015, USA.
authors.forename: Qi-Fa
authors.initials: QF
authors.lastname: Zhou