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Title: Neutron and x-ray scattering study of phonon dispersion and diffuse scattering in ( Na , Bi ) Ti O 3 - x BaTi O 3 single crystals near the morphotropic phase boundary

Neutron and x-ray scattering measurements were performed on (Na 1/2Bi 1/2)TiO 3-x at % BaTiO 3 (NBT-xBT) single crystals (x = 4, 5, 6.5, and 7.5) across the morphotropic phase boundary (MPB), as a function of both composition and temperature, and probing both structural and dynamical aspects. In addition to the known diffuse scattering pattern near the gamma points, our measurements revealed new, faint superlattice peaks, as well as an extensive diffuse scattering network, revealing a short-range ordering of polar nanoregions (PNR) with a static stacking morphology. Furthermore, in samples with compositions closest to the MPB, our inelastic neutron scattering investigations of the phonon dynamics showed two unusual features in the acoustic phonon branches, between the superlattice points, and between the superlattice points and gamma points, respectively. Finally, these critical elements are not present in the other compositions away from the MPB, which suggests that these features may be related to the tilt modes coupling behavior near the MPB.
Authors:
ORCiD logo [1] ;  [2] ;  [1] ;  [1] ;  [3] ;  [4] ;  [5] ;  [5] ;  [6]
  1. Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States). Materials Science and Engineering
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division
  4. Argonne National Lab. (ANL), Argonne, IL (United States). X-ray Science Division
  5. Chinese Academy of Sciences (CAS), Beijing (China). Shanghai Inst. of Ceramics
  6. Duke Univ., Durham, NC (United States). Mechanical Engineering and Materials Science Dept.; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division
Publication Date:
Grant/Contract Number:
SC0016166; AC02-06CH11357; AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 96; Journal Issue: 17; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Research Org:
Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Natural Science Foundation of China (NNSFC)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Ferroelectricity; Phase transitions; Piezoelectricity; Relaxor ferroelectrics; Single crystal materials; Neutron diffraction; X-ray scattering
OSTI Identifier:
1462872
Alternate Identifier(s):
OSTI ID: 1408219; OSTI ID: 1408260

Luo, Chengtao, Bansal, Dipanshu, Li, Jiefang, Viehland, Dwight, Winn, Barry, Ren, Yang, Li, Xiaobing, Luo, Haosu, and Delaire, Olivier. Neutron and x-ray scattering study of phonon dispersion and diffuse scattering in (Na,Bi)TiO3-xBaTiO3 single crystals near the morphotropic phase boundary. United States: N. p., Web. doi:10.1103/PhysRevB.96.174108.
Luo, Chengtao, Bansal, Dipanshu, Li, Jiefang, Viehland, Dwight, Winn, Barry, Ren, Yang, Li, Xiaobing, Luo, Haosu, & Delaire, Olivier. Neutron and x-ray scattering study of phonon dispersion and diffuse scattering in (Na,Bi)TiO3-xBaTiO3 single crystals near the morphotropic phase boundary. United States. doi:10.1103/PhysRevB.96.174108.
Luo, Chengtao, Bansal, Dipanshu, Li, Jiefang, Viehland, Dwight, Winn, Barry, Ren, Yang, Li, Xiaobing, Luo, Haosu, and Delaire, Olivier. 2017. "Neutron and x-ray scattering study of phonon dispersion and diffuse scattering in (Na,Bi)TiO3-xBaTiO3 single crystals near the morphotropic phase boundary". United States. doi:10.1103/PhysRevB.96.174108.
@article{osti_1462872,
title = {Neutron and x-ray scattering study of phonon dispersion and diffuse scattering in (Na,Bi)TiO3-xBaTiO3 single crystals near the morphotropic phase boundary},
author = {Luo, Chengtao and Bansal, Dipanshu and Li, Jiefang and Viehland, Dwight and Winn, Barry and Ren, Yang and Li, Xiaobing and Luo, Haosu and Delaire, Olivier},
abstractNote = {Neutron and x-ray scattering measurements were performed on (Na1/2Bi1/2)TiO3-x at % BaTiO3 (NBT-xBT) single crystals (x = 4, 5, 6.5, and 7.5) across the morphotropic phase boundary (MPB), as a function of both composition and temperature, and probing both structural and dynamical aspects. In addition to the known diffuse scattering pattern near the gamma points, our measurements revealed new, faint superlattice peaks, as well as an extensive diffuse scattering network, revealing a short-range ordering of polar nanoregions (PNR) with a static stacking morphology. Furthermore, in samples with compositions closest to the MPB, our inelastic neutron scattering investigations of the phonon dynamics showed two unusual features in the acoustic phonon branches, between the superlattice points, and between the superlattice points and gamma points, respectively. Finally, these critical elements are not present in the other compositions away from the MPB, which suggests that these features may be related to the tilt modes coupling behavior near the MPB.},
doi = {10.1103/PhysRevB.96.174108},
journal = {Physical Review B},
number = 17,
volume = 96,
place = {United States},
year = {2017},
month = {11}
}