Vortex structure transformation of BaTiO3 nanoparticles through the gradient function

被引：0
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作者：
Hong, L. [1 ]
Soh, A.K. [1 ]
Liu, S.Y. [1 ]
Lu, L. [2 ]
机构：
[1] Department of Mechanical Engineering, University of Hong Kong, Hong Kong, Hong Kong
[2] Department of Mechanical Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore 117576, Singapore
来源：
Journal of Applied Physics | 2009年 / 106卷 / 02期
关键词：
Phase field method has been used to simulate the vortex structures in BaTiO3 (BTO) nanoparticles. Through the modulation of the gradient coefficients; vortices are found to transform in a path of monoclinic M A →orthorhombicmonoclinic MC →tetragonal. Although the gradient coefficients vary significantly; the change in gradient energy is remarkably small. The simulation results show that the rotation and magnitude reduction in polarization dipoles increase the bulk energy; which induces the vortex transformation process in BTO nanoparticles. Moreover; the existence of monoclinic phase is a necessity to start the polarization rotation as well as the vortex transformation process. © 2009 American Institute of Physics;
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