材料科学
外延
铁电性
偶极子
电容器
薄膜
凝聚态物理
光电子学
电场
极化(电化学)
拉伤
复合材料
电压
纳米技术
电介质
电气工程
化学
医学
物理
图层(电子)
内科学
有机化学
物理化学
量子力学
工程类
作者
Zhongshuai Liang,Jiawei Wang,Xin Liu,Chao Li,Xianfeng Du
摘要
In this work, the epitaxial 0.85BaTiO3-0.15Bi(Mg1/2Ti1/2)O3 (BT-BMT) films with large compressive strain were fabricated on SrTiO3 (001). The expansion of the unit cell volume and out-of-plane lattice parameter and the large built-in electric field (Ebi) in BT-BMT films indicate the existence of defect dipoles. It was found that the polarization and the breakdown strength can be optimized by the strain and the defects, respectively. Ultimately, a desirable energy density of 90.3 J/cm3 with efficiency of 62.3% was achieved. It suggests that strain can serve as a practical means to modulate the energy storage performance of ferroelectric epitaxial film capacitors.
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