CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Effects of Interfacial Polarization on Voltage Tunability of Pb(Fe1/2Nb1/2)1-xTixO3 Single Crystals |
LIU Kui1, ZHANG Xin-Yi1, XIAO Jing-Zhong 1,2 |
1Surface Physics Laboratory (State Key Laboratory), Synchrotron Radiation Research Center, and Department of Physics of Fudan University, Shanghai 2004332International Centre for Materials Physics, Chinese Academy of Sciences, Shenyang 110016 |
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Cite this article: |
LIU Kui, ZHANG Xin-Yi, XIAO Jing-Zhong 2009 Chin. Phys. Lett. 26 107701 |
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Abstract The voltage tunability of Pb(Fe1/2Nb1/2)1-xTixO3 single crystals is investigated at a low electric field (<130 V/cm) in a low frequency range (<1 MHz). The results show that the capacitance is strongly suppressed by the applied dc biases for both the rhombohedral sample and the tetragonal sample. A negative voltage tunability is only detected in the tetragonal sample. The origin of the giant tunability and the negative tunability is discussed based on the multipolarization-mechanism model and the equivalent circuit model, respectively. It is ascribed to the interfacial polarization at the interface of electrode/sample.
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Keywords:
77.22.-d
77.84.Dy
77.84.Lf
77.90.+k
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Received: 09 March 2009
Published: 27 September 2009
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PACS: |
77.22.-d
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(Dielectric properties of solids and liquids)
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77.84.Dy
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77.84.Lf
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(Composite materials)
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77.90.+k
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(Other topics in dielectrics, piezoelectrics, and ferroelectrics and their properties)
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