Compositionally graded epitaxial barium strontium titanate thin films derived from pulsed laser deposition

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• 作者：Lu ; S.G. ; Zhu ; X.H. ; Mak ; C.L. ; Wong ; K.H. ; Chan ; H.L.W. ; Choy ; C.L.
• 关键词：BST ; Compositional gradient ; Thin films ; PLD ; Dielectric constant
• 刊名：Materials Chemistry and Physics
• 出版年：2003
• 期刊代码：58_02540584
• 类别：ms
• 出版时间：April 10, 2003
• 卷：79
• 期：2-3
• 页码：164-168
• 文件大小：168 K

摘要

Epitaxial graded barium strontium titanate (Ba_xSr_1−x)TiO₃ (x=0.75, 0.8, 0.9, 1.0) thin films were prepared through pulsed laser deposition method on the (La_0.7Sr_0.3)MnO₃ (LSMO)/LaAlO₃ (LAO) substrate. XRD analysis indicated the graded film had a broadened 2θ peak at 45° for the (200) peak. The energy dispersive analysis of X-ray (EDAX) showed a gradient change of Ba/Sr composition. P–E loop measurement gave a remnant polarization about 2μCcm^−2, and without big up offset observed. A big room temperature dielectric constant as high as 1600 was obtained and has an approximately linear relationship with temperature from room temperature to 130°C. All these results can be ascribed to the epitaxial and graded structure of BST thin films.