Size Driven Ferroelectric-Paraelectric Phase Transition from the Surface Energy Viewpoint

Chin. Phys. Lett.

2003, Vol. 20

Issue (7): 1134-1136 DOI:

Original Articles

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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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.

Keywords: 77.80.Bh 68.18.Jk

Published: 01 July 2003

PACS:	77.80.Bh
	68.18.Jk	(Phase transitions in liquid thin films)

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https://cpl.iphy.ac.cn/ OR https://cpl.iphy.ac.cn/Y2003/V20/I7/01134

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