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

• 来源期刊: 中国物理快报（英文版）
• 年，卷（期）: 2003,（7）
• 页码范围: 1134-1136
• 页数: 3页
• 语种: 英文

摘要

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 decreasing the volume free energy by polarization and increasing 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.