Ferroelectric properties in thin film barium titanate grown using pulsed laser deposition
Ferroelectric properties in thin film barium titanate grown using pulsed laser deposition
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DOI：
10.1063/1.4895050
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发表时间：
2014-09-28
影响因子：
3.2
通讯作者：
O'Neill, Anthony
中科院分区：
文献类型：
--
作者：
Appleby, Daniel J. R.;Ponon, Nikhil K.;O'Neill, Anthony
研究了脉冲激光沉积法制备的多晶BaTiO_3金属-绝缘体-金属电容器从室温到420 K的特性。的电容-电压特性示出在室温下的铁电行为，与顺电相变在较高的温度。然而，介电常数响应显示在所有测量温度下的顺电行为。因此，BaTiO 3在这里以立方相和四方相的混合物存在。BaTiO 3薄膜具有柱状结构，晶粒尺寸随着薄膜厚度的增加而增加，这是由于它们的高度而不是直径增加。这与剩余极化的增加相关。结果支持的多晶钛酸钡薄膜的尺寸驱动相变。(C)2014 AIP Publishing LLC.
The characteristics of polycrystalline BaTiO3 metal-insulator-metal capacitors, fabricated using pulsed laser deposition, are investigated from room temperature to 420K. The capacitance-voltage characteristics show ferroelectric behaviour at room temperature, with a phase transition to paraelectric at higher temperature. However, the permittivity response shows paraelectric behaviour across all measured temperatures. So BaTiO3 exists here in a mixture of cubic and tetragonal phases. The BaTiO3 films have a columnar structure, with grain size increasing with film thickness due to their increasing height but not diameter. This correlates with an increase in remnant polarization. The results support a size driven phase transition in thin films of polycrystalline BaTiO3. (C) 2014 AIP Publishing LLC.