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Size Driven Ferroelectric-Paraelectric Phase Transition from the Surface Energy Viewpoint |
ZHONG Wei-Lie;WANG Yuan-Xu;ZHANG Pei-Lin |
School of Physics and Microelectronics, State Key Laboratory of Crystal Materials, Shandong University, Ji’nan 250100
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Cite this article: |
ZHONG Wei-Lie, WANG Yuan-Xu, ZHANG Pei-Lin 2003 Chin. Phys. Lett. 20 1134-1136 |
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Abstract The size driven ferroelectric-paraelectric phase transition in a ferroelectric of small size is studied within the framework of Landau phase transition theory. The transition is a consequence of the competition between the decrease of the volume free energy by polarization and the increase of the surface energy of the ferroelectric phase, which has a surface energy density higher than that in the paraelectric phase. A simple expression for the ferroelectric critical size as a function of the Landau free energy coefficients and the surface energy density is derived.
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Keywords:
77.80.Bh
68.18.Jk
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Published: 01 July 2003
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