Neutron and x-ray scattering study of phonon dispersion and diffuse scattering in (Na,Bi)Ti O3-xBaTi O3 single crystals near the morphotropic phase boundary
Research output: Journal Publications and Reviews (RGC: 21, 22, 62) › 21_Publication in refereed journal › peer-review
Author(s)
Detail(s)
Original language | English |
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Article number | 174108 |
Journal / Publication | Physical Review B |
Volume | 96 |
Issue number | 17 |
Publication status | Published - 10 Nov 2017 |
Externally published | Yes |
Link(s)
DOI | DOI |
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Document Link | Links |
Link to Scopus | https://www.scopus.com/record/display.uri?eid=2-s2.0-85039160972&origin=recordpage |
Permanent Link | https://scholars.cityu.edu.hk/en/publications/publication(3ce3bd5a-067b-442b-bd41-f79622a12bff).html |
Abstract
Neutron and x-ray scattering measurements were performed on (Na1/2Bi1/2)TiO3-xat%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 Γ 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. 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 Γ points, respectively. 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.
Bibliographic Note
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Citation Format(s)
Neutron and x-ray scattering study of phonon dispersion and diffuse scattering in (Na,Bi)Ti O3-xBaTi O3 single crystals near the morphotropic phase boundary. / Luo, Chengtao; Bansal, Dipanshu; Li, Jiefang et al.
In: Physical Review B, Vol. 96, No. 17, 174108, 10.11.2017.Research output: Journal Publications and Reviews (RGC: 21, 22, 62) › 21_Publication in refereed journal › peer-review