title: Diffuse Phase Transitions and Giant Electrostrictive Coefficients in Lead-Free Fe3+-Doped 0.5Ba(Zr0.2Ti0.8)O3-0.5(Ba0.7Ca0.3)TiO3Ferroelectric Ceramics.
abstract: The electrostrictive effect has some advantages over the piezoelectric effect, including temperature stability and hysteresis-free character. In the present work, we report the diffuse phase transitions and electrostrictive properties in lead-free Fe3+-doped 0.5Ba(Zr0.2Ti0.8)O3-0.5(Ba0.7Ca0.3)TiO3(BZT-0.5BCT) ferroelectric ceramics. The doping concentration was set from 0.25 to 2 mol %. It is found that by introducing Fe3+ion into BZT-0.5BCT, the temperature corresponding to permittivity maximum Tmwas shifted toward lower temperature monotonically by 37 °C per mol % Fe3+ion. Simultaneously, the phase transitions gradually changed from classical ferroelectric-to-paraelectric phase transitions into diffuse phase transitions with a weak relaxor characteristic. Purely electrostrictive responses with giant electrostrictive coefficient Q33between 0.04 and 0.05 m4/C2are observed from 25 to 100 °C for the compositions doped with 1-2 mol % Fe3+ion. The Q33of Fe3+-doped BZT-0.5BCT ceramics is almost twice the Q33of other ferroelectric ceramics. These observations suggest that the present system can be considered as a potential lead-free material for the applications in electrostrictive area and that BT-based ferroelectric ceramics would have giant electrostrictive coefficient over other ferroelectric systems.
authors: Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education & International Center for Dielectric Research, Xi'an Jiaotong University , Xi'an 710049, China.
authors: Li
authors: L
authors: Jin
authors: Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education & International Center for Dielectric Research, Xi'an Jiaotong University , Xi'an 710049, China.
authors: Renjie
authors: R
authors: Huo
authors: Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education & International Center for Dielectric Research, Xi'an Jiaotong University , Xi'an 710049, China.
authors: Runping
authors: R
authors: Guo
authors: Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education & International Center for Dielectric Research, Xi'an Jiaotong University , Xi'an 710049, China.|Department of Materials Science and Engineering, Pennsylvania State University , University Park, Pennsylvania 16802, United States.
authors: Fei
authors: F
authors: Li
authors: Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education & International Center for Dielectric Research, Xi'an Jiaotong University , Xi'an 710049, China.
authors: Dawei
authors: D
authors: Wang
authors: Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education & International Center for Dielectric Research, Xi'an Jiaotong University , Xi'an 710049, China.
authors: Ye
authors: Y
authors: Tian
authors: Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education & International Center for Dielectric Research, Xi'an Jiaotong University , Xi'an 710049, China.
authors: Qingyuan
authors: Q
authors: Hu
authors: Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education & International Center for Dielectric Research, Xi'an Jiaotong University , Xi'an 710049, China.
authors: Xiaoyong
authors: X
authors: Wei
authors: State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing , Beijing 100083, China.
authors: Zhanbing
authors: Z
authors: He
authors: Faculty of Materials and Energy, Southwest University , Chongqing 400715, China.
authors: Yan
authors: Y
authors: Yan
authors: Faculty of Materials and Energy, Southwest University , Chongqing 400715, China.
authors: Gang
authors: G
authors: Liu
keywords: diffuse phase transition; doping; electrostriction; ferroelectric; lead-free