Size Driven Ferroelectric—paraelectric Phase Transition from the Surface Energy Viewpoint |
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引用本文: | 钟维烈,王渊旭,张沛霖.Size Driven Ferroelectric—paraelectric Phase Transition from the Surface Energy Viewpoint[J].中国物理快报,2003,20(7):1134-1136. |
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作者姓名: | 钟维烈 王渊旭 张沛霖 |
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作者单位: | SchoolofPhysicsandMicroelectronics,StateKeylaboratoryofCrystalmaterials,Shandonguniversity,Ji‘nan250100 |
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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.
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关 键 词: | 顺铁电相变 铁电体 结构分析 尺寸 表面能量密度 |
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