Department of Materials Science and Engineering, University of Florida, Gainesville, FL 32611, USA.
Nanoscale. 2013 Nov 21;5(22):10901-7. doi: 10.1039/c3nr01982a. Epub 2013 Sep 23.
A novel method for synthesis of Barium Strontium Titanate (BST) films with a high degree of texture is developed with a two-step hydrothermal reaction and without the need for costly equipment. The dielectric constant and ferroelectric properties of the film can be tuned by varying the Ba : Sr molar ratio of the materials. The maximum ambient temperature dielectric constant of these BST films can reach 811 when the Ba molar fraction ("x" in BaxSr1-xTiO3) is 0.71, which corresponds with the tetragonal to cubic phase transition of the solid solution. The ferroelectric behavior of the Ba0.91Sr0.09TiO3 film is confirmed by atomic force microscopy (AFM).
一种新颖的方法，用于合成具有高度织构的钡锶钛酸盐（BST）薄膜，该方法采用两步水热反应，无需昂贵的设备。通过改变材料的钡：锶摩尔比，可以调整薄膜的介电常数和铁电性能。当 Ba 摩尔分数（BaxSr1-xTiO3 中的“x”）为 0.71 时，这些 BST 薄膜的最大环境温度介电常数可达到 811，这对应于固溶体的四方相到立方相转变。原子力显微镜（AFM）证实了 Ba0.91Sr0.09TiO3 薄膜的铁电行为。
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