title: High and Temperature-Insensitive Piezoelectric Strain in Alkali Niobate Lead-free Perovskite.
abstract: With growing concern over world environmental problems and increasing legislative restriction on using lead and lead-containing materials, a feasible replacement for lead-based piezoceramics is desperately needed. Herein, we report a large piezoelectric strain (d33*) of 470 pm/V and a high Curie temperature (Tc) of 243 °C in (Na0.5K0.5)NbO3-(Bi0.5Li0.5)TiO3-BaZrO3lead-free ceramics by doping MnO2. Moreover, excellent temperature stability is also observed from room temperature to 170 °C (430 pm/V at 100 °C and 370 pm/V at 170 °C). Thermally stimulated depolarization currents (TSDC) analysis reveals the reduced defects and improved ferroelectricity in MnO2-doped piezoceramics from a macroscopic view. Local poling experiments and local switching spectroscopy piezoresponse force microscopy (SS-PFM) demonstrates the enhanced ferroelectricity and domain mobility from a microscopic view. Distinct grain growth and improvement in phase angle may also account for the enhancement of piezoelectric properties.
authors.affiliation: State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University , Beijing 100084, P. R. China.
authors.forename: Mao-Hua
authors.initials: MH
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University , Beijing 100084, P. R. China.
authors.forename: Ke
authors.identifier: 0000-0001-9840-2427
authors.initials: K
authors.lastname: Wang
authors.affiliation: Microsystem and Terahertz Research Center, China Academy of Engineering Physics , Chengdu 610200, P. R. China.
authors.forename: Yi-Jia
authors.initials: YJ
authors.lastname: Du
authors.affiliation: Microsystem and Terahertz Research Center, China Academy of Engineering Physics , Chengdu 610200, P. R. China.
authors.forename: Gang
authors.initials: G
authors.lastname: Dai
authors.affiliation: State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University , Beijing 100084, P. R. China.
authors.forename: Wei
authors.initials: W
authors.lastname: Sun
authors.affiliation: State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University , Beijing 100084, P. R. China.
authors.forename: Geng
authors.initials: G
authors.lastname: Li
authors.affiliation: State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University , Beijing 100084, P. R. China.
authors.forename: Duan
authors.initials: D
authors.lastname: Hu
authors.affiliation: State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University , Beijing 100084, P. R. China.
authors.forename: Hao Cheng
authors.initials: HC
authors.lastname: Thong
authors.affiliation: State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University , Beijing 100084, P. R. China.
authors.forename: Chunlin
authors.initials: C
authors.lastname: Zhao
authors.affiliation: State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University , Beijing 100084, P. R. China.
authors.forename: Xiao-Qing
authors.initials: XQ
authors.lastname: Xi
authors.affiliation: State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University , Beijing 100084, P. R. China.
authors.forename: Zhen-Xing
authors.initials: ZX
authors.lastname: Yue
authors.affiliation: State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University , Beijing 100084, P. R. China.
authors.forename: Jing-Feng
authors.initials: JF
authors.lastname: Li