Local-structure evidence for a phase transition in a lead-free single crystal of (Na1/2Bi1/2)TiO30.06BaTiO3 by absorption fine-structure spectroscopy with synchrotron x-ray radiation

Xiaobing Li, Shengdong Nie, Feifei Wang, Xiangyong Zhao, Haiwu Zhang, Haosu Luo, Guorong Li, Jae-Hyeon Ko, Zhi Guo, Zheng Jiang, and Renzhong Tai
Phys. Rev. B 101, 104105 – Published 26 March 2020
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Abstract

(Na1/2Bi1/2)TiO3xBaTiO3(NBTxBT) single crystal, as one of the most promising candidates to replace lead-based ferroelectrics, is a typical and unique lead-free system with morphotropic phase boundary (MPB) by far. In this paper, the phase transition process of NBT-0.06BT crystal in a wide temperature range of 20550C was analyzed at atomic scale by theoretical fitting to the measured synchrotron radiation x-ray absorption fine structure spectra quantitatively. Detailed analysis revealed a gradually transition of local structure at the point of phase transition from rhombohedral to tetragonal phase in NBT-0.06BT crystal on the bond lengths of Bi-O and Bi-Ti. The continuous evolution of local structure with no obvious barrier to overcome is one of the intrinsic characteristics of MPB at atomic scale and is responsible for the high piezoelectric properties. These results could promote the understanding of the origin of the high piezoelectric performance around the MPB and meanwhile guide new lead-free material designs.

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  • Received 6 August 2019
  • Revised 8 March 2020
  • Accepted 10 March 2020

DOI:https://doi.org/10.1103/PhysRevB.101.104105

©2020 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Xiaobing Li1, Shengdong Nie1, Feifei Wang2,*, Xiangyong Zhao2, Haiwu Zhang3, Haosu Luo3, Guorong Li3, Jae-Hyeon Ko4, Zhi Guo5, Zheng Jiang5, and Renzhong Tai5

  • 1School of Medical Instrument and Food Engineering, University of Shanghai for Science and Technology, 516 Jungong Road, Yangpu, Shanghai 200093, China
  • 2Key Laboratory of Optoelectronic Material and Device, Department of Physics, Shanghai Normal University, Shanghai 200234, China
  • 3Key Laboratory of Inorganic Functional Material and Device, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 215 Chengbei Road, Jiading, Shanghai 201800, China
  • 4Department of Physics, Hallym University, 1Hallymdaehakgil, Chuncheon, Gangwondo 24252, Republic of Korea
  • 5Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of Sciences, 239 Zhangheng Road, Pudong New District, Shanghai 201204, China

  • *f_f_w@sohu.com; ffwang@shnu.edu.cn

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Issue

Vol. 101, Iss. 10 — 1 March 2020

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