title: Giant Polarization and High Temperature Monoclinic Phase in a Lead-Free Perovskite of Bi(Zn0.5Ti0.5)O3-BiFeO3.
abstract: Lead-free piezoelectrics have attracted increasing attention because of the awareness of lead toxicity to the environment. Here, a new bismuth-based lead-free perovskite, (1 - x)Bi(Zn0.5Ti0.5)O3-xBiFeO3, has been synthesized via a high-pressure and high-temperature method. It exhibits interesting properties of giant polarization, morphotropic phase boundary (MPB), and monoclinic phase. In particular, large tetragonality (c/a = 1.228) and giant spontaneous polarization of 110 μC/cm2has been obtained in 0.6 Bi(Zn0.5Ti0.5)O3-0.4BiFeO3, which is much higher than most available lead-free materials and conventional Pb(Zr,Ti)O3. MPB is clearly identified to be constituted of tetragonal and monoclinic phases at x = 0.5. Notably, a single monoclinic phase has been observed at x = 0.6, which exhibits an intriguing high-temperature property. The present results are helpful to explore new lead-free MPB systems in bismuth-based compounds.
authors.forename: Zhao
authors.initials: Z
authors.lastname: Pan
authors.affiliation: Materials and Structures Laboratory, Tokyo Institute of Technology , 4259 Nagatsuta, Midori, Yokohama 226-8503, Japan.
authors.forename: Jun
authors.initials: J
authors.lastname: Chen
authors.affiliation: Materials and Structures Laboratory, Tokyo Institute of Technology , 4259 Nagatsuta, Midori, Yokohama 226-8503, Japan.
authors.forename: Runze
authors.initials: R
authors.lastname: Yu
authors.affiliation: Materials and Structures Laboratory, Tokyo Institute of Technology , 4259 Nagatsuta, Midori, Yokohama 226-8503, Japan.
authors.forename: Hajime
authors.initials: H
authors.lastname: Yamamoto
authors.forename: Yangchun
authors.initials: Y
authors.lastname: Rong
authors.forename: Lei
authors.initials: L
authors.lastname: Hu
authors.forename: Qiang
authors.initials: Q
authors.lastname: Li
authors.forename: Kun
authors.initials: K
authors.lastname: Lin
authors.forename: Li
authors.initials: L
authors.lastname: You
authors.forename: Kun
authors.initials: K
authors.lastname: Zhao
authors.forename: Longlong
authors.initials: L
authors.lastname: Fan
authors.affiliation: X-ray Science Division, Argonne National Laboratory , Argonne, Illinois 60439, United States.
authors.forename: Yang
authors.initials: Y
authors.lastname: Ren
authors.affiliation: RIKEN SPring-8 Center , 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan.
authors.forename: Kenichi
authors.initials: K
authors.lastname: Kato
authors.affiliation: Materials and Structures Laboratory, Tokyo Institute of Technology , 4259 Nagatsuta, Midori, Yokohama 226-8503, Japan.
authors.forename: Masaki
authors.initials: M
authors.lastname: Azuma
authors.forename: Xianran
authors.initials: X
authors.lastname: Xing