Low temperature structural variations of Na0.5Bi0.5TiO3-7%BaTiO3 single crystal: Evidences from optical ellipsometry and Raman scattering

T. Huang; S. Guo; L. P. Xu; C. Chen; Z. G. Hu; H. S. Luo; J. H. Chu

doi:10.1063/1.4922424

Low temperature structural variations of Na_0.5Bi_0.5TiO₃-7%BaTiO₃ single crystal: Evidences from optical ellipsometry and Raman scattering

T. Huang
, S. Guo
, L. P. Xu
, C. Chen
, Z. G. Hu^*
, H. S. Luo
, J. H. Chu

^*Corresponding author for this work

School of Physics and Electronic Science

Research output: Contribution to journal › Article › peer-review

14 Scopus citations

Abstract

Optical properties and structural variations of Na_0.5Bi_0.5TiO₃-7%BaTiO₃ (NBT-7%BT) single crystal have been studied by temperature-dependent optical ellipsometry and Raman spectroscopy from 4.2 to 300 K. The second derivative of the complex dielectric functions reveals two interband transitions (E cp 1 and E cp 2) located at about 3.49 and 4.25 eV, respectively. Depending on the temperature evolution of electronic transitions, structural variations appear near 60, 150, and 240 K, respectively. These anomalies are also well illustrated from the low-frequency phonon modes involving vibrations of Bi. The low-temperature structural variations of NBT-7%BT crystal can be associated with instability of the crystalline lattice driven by off-centered Bi ions, followed by the variations of polarizability of the unit cells.

Original language	English
Article number	224103
Journal	Journal of Applied Physics
Volume	117
Issue number	22
DOIs	https://doi.org/10.1063/1.4922424
State	Published - 14 Jun 2015

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@article{c4913c1378734c479008bf7309eef533,

title = "Low temperature structural variations of Na0.5Bi0.5TiO3-7\%BaTiO3 single crystal: Evidences from optical ellipsometry and Raman scattering",

abstract = "Optical properties and structural variations of Na0.5Bi0.5TiO3-7\%BaTiO3 (NBT-7\%BT) single crystal have been studied by temperature-dependent optical ellipsometry and Raman spectroscopy from 4.2 to 300 K. The second derivative of the complex dielectric functions reveals two interband transitions (E cp 1 and E cp 2) located at about 3.49 and 4.25 eV, respectively. Depending on the temperature evolution of electronic transitions, structural variations appear near 60, 150, and 240 K, respectively. These anomalies are also well illustrated from the low-frequency phonon modes involving vibrations of Bi. The low-temperature structural variations of NBT-7\%BT crystal can be associated with instability of the crystalline lattice driven by off-centered Bi ions, followed by the variations of polarizability of the unit cells.",

author = "T. Huang and S. Guo and Xu, \{L. P.\} and C. Chen and Hu, \{Z. G.\} and Luo, \{H. S.\} and Chu, \{J. H.\}",

note = "Publisher Copyright: {\textcopyright} 2015 AIP Publishing LLC.",

year = "2015",

month = jun,

day = "14",

doi = "10.1063/1.4922424",

language = "英语",

volume = "117",

journal = "Journal of Applied Physics",

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TY - JOUR

T1 - Low temperature structural variations of Na0.5Bi0.5TiO3-7%BaTiO3 single crystal

T2 - Evidences from optical ellipsometry and Raman scattering

AU - Huang, T.

AU - Guo, S.

AU - Xu, L. P.

AU - Chen, C.

AU - Hu, Z. G.

AU - Luo, H. S.

AU - Chu, J. H.

PY - 2015/6/14

Y1 - 2015/6/14

N2 - Optical properties and structural variations of Na0.5Bi0.5TiO3-7%BaTiO3 (NBT-7%BT) single crystal have been studied by temperature-dependent optical ellipsometry and Raman spectroscopy from 4.2 to 300 K. The second derivative of the complex dielectric functions reveals two interband transitions (E cp 1 and E cp 2) located at about 3.49 and 4.25 eV, respectively. Depending on the temperature evolution of electronic transitions, structural variations appear near 60, 150, and 240 K, respectively. These anomalies are also well illustrated from the low-frequency phonon modes involving vibrations of Bi. The low-temperature structural variations of NBT-7%BT crystal can be associated with instability of the crystalline lattice driven by off-centered Bi ions, followed by the variations of polarizability of the unit cells.

AB - Optical properties and structural variations of Na0.5Bi0.5TiO3-7%BaTiO3 (NBT-7%BT) single crystal have been studied by temperature-dependent optical ellipsometry and Raman spectroscopy from 4.2 to 300 K. The second derivative of the complex dielectric functions reveals two interband transitions (E cp 1 and E cp 2) located at about 3.49 and 4.25 eV, respectively. Depending on the temperature evolution of electronic transitions, structural variations appear near 60, 150, and 240 K, respectively. These anomalies are also well illustrated from the low-frequency phonon modes involving vibrations of Bi. The low-temperature structural variations of NBT-7%BT crystal can be associated with instability of the crystalline lattice driven by off-centered Bi ions, followed by the variations of polarizability of the unit cells.

UR - https://www.scopus.com/pages/publications/84935849045

U2 - 10.1063/1.4922424

DO - 10.1063/1.4922424

M3 - 文章

AN - SCOPUS:84935849045

SN - 0021-8979

VL - 117

JO - Journal of Applied Physics

JF - Journal of Applied Physics

IS - 22

M1 - 224103

ER -

Low temperature structural variations of Na_0.5Bi_0.5TiO₃-7%BaTiO₃ single crystal: Evidences from optical ellipsometry and Raman scattering

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