Effect of elevated concentrations of strontium and iron on the structural and dielectric characteristics of Ba_{(1鈭?span style='font-style: italic'>x鈭?span style='font-style: italic'>y)}Sr_(x)Ti Fe_(y)O₃ prepared

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• 作者：Omer Nur^a ; Magnus Willander^a ; Muhammad Q. Israr^a ; Fawzy G. El Desouky^b ; Mohamed A. Salem^b ; Ali B. Abou Hamad^b ; Inas K. Battisha^b ; ^{szbasha@yahoo.com}
• 关键词：Nano-composite BaSrTiO3 (BST) ; Iron-doping ; Sol&ndash ; gel ; Dielectric permittivity ; Phase and microstructure
• 刊名：Physica B
• 出版年：2012
• 期刊代码：53_09214526
• 类别：ph
• 出版时间：15 July, 2012
• 卷：407
• 期：14
• 页码：2697-2704
• 文件大小：1985 K

摘要

Nano-composite Ba_1鈭?em>xSr_(x)TiO₃ (BST), where x=0.01-0.50 and doped with different concentrations of iron Ba_{(1鈭?em>x鈭?em>y)}Sr_(x)TiFe _(y)O₃ (BSTF), where x=0.01 and y=0.01-0.05 powders were prepared by sol-gel method.

The effect of increasing the iron and strontium concentrations substituted in Barium strontium titanate system will be studied. The prepared samples have a tetragonal crystalline phase after sintering for 1 h at 750 掳C in air. The structural and the morphological features of the systems have been studied using X-ray diffraction (XRD), transmission electron microscope (TEM) and scanning electron microscope (SEM). The dielectric properties of the BST and BSTF systems have been investigated as a function of temperature and frequency. The dielectric measurements are carried out in the frequency range 42 Hz-1 MHz, at a temperature ranging between 25 and 250 掳C.

The results showed a decrease in T_c temperature giving the following values 90 and 85 掳C for B₁₀ST and B₁₀ST₅F prepared powder samples, respectively, implying tetragonal, feroelectric phase at lower temperature into cubic, para-electric phase at temperature higher than T_c.