Structures and Dielectric Properties of Pb(Fe1/2Nb1/2)1-xTixO3 Single Crystals
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概要
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The structures and dielectric properties of Pb(Fe1/2Nb1/2)1-xTixO3 (PFNT, x = 0.07 and 0.48) single crystals were investigated using a combination of temperature-dependent dielectric, X-ray diffraction (XRD), Raman, and X-ray absorption fine structure (XAFS) spectra. Detailed structure analyses reveal that the crystal structure of PFNT (x = 0.48) is single-phase tetragonal perovskite, whereas that of PFNT (x = 0.07) is a mixture of rhombohedral and tetragonal phases. The structural differences are found to have significant connections with the dielectric properties in the temperature range of 90--300 K. Both samples exhibit a frequency-dependent dielectric anomaly, arising primarily from the 3d electrons hopping between Fe2+ and Fe3+. The second dielectric anomaly, which is a weak frequency dispersion and observable only for PFNT (x = 0.07), was probably caused by a dipole glass behavior near the morphotropic phase boundary.
- 2012-11-25
著者
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Oyanagi Hiroyuki
Photonic Institute, National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8568, Japan
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Liu Kui
State Key Laboratory for Surface Physics, Synchrotron Radiation Research Center, and Department of Physics of Fudan University, Shanghai 200433, China
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Zhang Xinyi
State Key Laboratory for Surface Physics, Synchrotron Radiation Research Center, and Department of Physics of Fudan University, Shanghai 200433, China
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Wei Shiqiang
National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, China
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Xiao Jingzhong
State Key Laboratory for Surface Physics, Synchrotron Radiation Research Center, and Department of Physics of Fudan University, Shanghai 200433, China
関連論文
- Anisotropic colossal dielectric response of 0.93Pb(Fe1/2Nb1/2)O3-0.07PbTiO3 single crystals along and directions
- Structures and Dielectric Properties of Pb(Fe1/2Nb1/2)1-xTixO3 Single Crystals