Quantitative Structure-Property Relationship in a Combinatorial Bi4-xLaxTi3O12 (0 x 1) Th

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• 作者：Ki Woong Kim ; Min Ku Jeon ; Tai Suk Kim ; Kwang Seok Oh ; Joong-Won Shin ; Seong Ihl Woo
• 刊名：Journal of Combinatorial Chemistry
• 出版年：2007
• 出版时间：September 2007
• 年：2007
• 卷：9
• 期：5
• 页码：823 - 827
• 全文大小：211K
• 年卷期：v.9,no.5(September 2007)
• ISSN：1520-4774

文摘

A ferroelectric Bi_4-xLa_xTi₃O₁₂ (BLT) thin film library was fabricated from Bi₂O₃/La₂O₃/TiO₂ multilayersusing a multitarget RF-sputtering system equipped with an automated shutter. The polarization-electricfield and structure were mapped as a function of the La content from x = 0 to 1. Remnant polarization (P_r)increased as the La content decreased, and it reached a maximum 2P_r of 20 C/cm² at x = 0.28. At x <0.28, 2P_r decreased gradually as the La content decreased. This compositional dependence of the remanentpolarization was the result of the degree of TiO₆ tilting along the a-b plane changing as a function of theLa content. This was quantitatively related to the intensity ratio between the (117) peak and the (008) peakin the X-ray diffraction (XRD) pattern and to the intensity of the Raman band at 848 cm^-1, arising fromstretching mode of TiO₆ octahedrons.