Dielectric ferroelectric properties and electric field-inducedstrain in (1-x)BNKT2-xBCT lead-free piezoelectric ceramics
SONG Wu-hui, YANG Jing-na, LIU Qian, ZHAO Xiao-gang, CHENG Lin, LIANG Hai-rong, YAN Yan, LIU Peng*
(College of Physics and Information Technology, Shaanxi Normal University, Xi′an 710062 Shaanxi, China)
Abstract:
The (1-x)BNKT2-xBCT lead free ceramics are prepared by the conventional solid-state sintering process.The phase components,dielectric, ferroelectric properties and electric field-induced strain with BCT are investigated. It is indicated that under the demanded condition all samples are pure perovskite structure,tetragonal and pseudo-cubic phase transition region exists in the range of x=0.04 to 0.08.The depolarization temperature of the material tend to room temperature and relaxation enhancements to γ=1.94. The ferroelectric of the material is weakened strongly, making the remanent polarization and piezoelectric coefficient appears significant reduction. Near the x=0.04 strain reached maximun 0.122%, d*33 reached 230 pm/V.
KeyWords:
relaxation behavior； ferroelectric property； electric field-induced strain
