Structure and lattice dynamics in PbTiO3–Bi(Zn1/2Ti1/2)O3 solid solutions

( 1 − x ) PbTiO 3 – x Bi ( Zn 1 / 2 Ti 1 / 2 ) O 3 solid solutions show a much enhanced tetragonality (c/a) and Curie temperature (TC). The detailed structure of (1−x)PbTiO3–xBi(Zn1/2Ti1/2)O3 is studied by means of neutron powder diffraction based on the Rietveld refinement. Zn exhibits a more polar...

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Bibliographic Details
Published in:Journal of applied physics 2009-02, Vol.105 (4)
Main Authors: Chen, Jun, Sun, Xueyi, Deng, Jinxia, Zu, Yong, Liu, Yuntao, Li, Junhong, Xing, Xianran
Format: Article
Language:English
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Summary:( 1 − x ) PbTiO 3 – x Bi ( Zn 1 / 2 Ti 1 / 2 ) O 3 solid solutions show a much enhanced tetragonality (c/a) and Curie temperature (TC). The detailed structure of (1−x)PbTiO3–xBi(Zn1/2Ti1/2)O3 is studied by means of neutron powder diffraction based on the Rietveld refinement. Zn exhibits a more polarizable property than Ti, resulting in a B-site cation splitting (0.27 Å) between Zn and Ti along c-axis direction. The spontaneous polarization displacements are enhanced by the substitution of Bi(Zn1/2Ti1/2)O3. The lattice dynamics study of (1−x)PbTiO3–xBi(Zn1/2Ti1/2)O3 by Raman scattering spectroscopy reveals that the optical modes [A1 (1TO), A1 (2TO), and E (2TO)] are abnormally hardened by the substitution of Bi(Zn1/2Ti1/2)O3 for PbTiO3, indicating the enhanced PS and the strong hybridization between Pb/Bi and O. The ceramic of (1−x)PbTiO3–xBi(Zn1/2Ti1/2)O3 (x=0.3) exhibits a low dielectric loss (tan δ) due to the d0 electronic structure.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.3068459