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Dynamic Multiscale Model for Dielectric Anomaly in PbTiO3-CoFe2O4 Epitaxial Nanocomposite Film |
| HU Chuan-Sheng1, SUN Xia2, LUO Zhen-Lin1**, GAO Chen1,3** |
1National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029
2Department of Physics, University of Science and Technology of China, Hefei 230026
3CAS Key Laboratory of Materials for Energy Conversion and Collaborative Innovation Center of Chemistry for Energy Materials, University of Science and Technology of China, Hefei 230026
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| Cite this article: |
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HU Chuan-Sheng, SUN Xia, LUO Zhen-Lin et al 2014 Chin. Phys. Lett. 31 110501 |
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Abstract Theoretical calculations based on a multiscale model are proposed to interpret the dielectric anomalous enhancement observed around x=0.2 in the (PbTiO3)1?x-(CoFe2O4)x (0≤x≤1) epitaxial nanocomposite spread film. First principles calculation combined with thermodynamics statistics reveals that the dynamic ratio between different PbTiO3 phases under an external electric field is responsible for the dielectric anomaly. To verify this model with direct microstructure evidence, high resolution and high accuracy synchrotron radiation x-ray diffraction of (PbTiO3)0.8-(CoFe2O4)0.2 epitaxial composite film under an in situ electric field is collected, in which an obvious modulation of the phase balance of PbTiO3 is observed.
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Published: 28 November 2014
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| PACS: |
05.70.Ce
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(Thermodynamic functions and equations of state)
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02.70.Rr
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(General statistical methods)
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77.80.bg
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(Compositional effects)
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