Strain Induced Metastable Phase and Phase Revolution in PbTiO3-CoFe2O4 Nanocomposite Film
HU Chuan-Sheng1, LUO Zhen-Lin1**, SUN Xia2, PAN Guo-Qiang1, HE Qing3, WEN Wen3, ZHOU Xing-Tai3, Ichiro Takeuchi4, GAO Chen1,2,5**
1National Synchrotron Radiation Laboratory & School of Nuclear Science and Technology, University of Science and Technology of China, Hefei 230026 2Department of Physics, University of Science and Technology of China, Hefei 230026 3Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, P. O. Box 800-204, Shanghai 201800 4Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, USA 5Department of Materials Science and Engineering & CAS Key Laboratory of Materials for Energy Conversion, University of Science and Technology of China, Hefei 230026
Abstract：An inter-component epitaxial strain-induced PbTiO3 metastable phase is observed in a PbTiO3-CoFe2O4 epitaxial composite film, corresponding to the dielectric anomaly reported previously. High-resolution synchrotron radiation X-ray diffraction and first principles calculation demonstrate the coexistence of different PbTiO3 phases, even a possible morphotropic phase boundary in the film, elucidating the underlying microscopic mechanism of the formation of PbTiO3 metastable phase. This sheds light on the design and manipulation of electromechanical properties of epitaxial films, through the strain engineering.
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2014, Vol. 31 
