Structural and dielectric properties of barium strontium titanate produced by high temperature hydrothermal method
Structural and dielectric properties of barium strontium titanate produced by high temperature hydrothermal method
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DOI：
10.1016/j.jallcom.2006.02.093
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发表时间：
2008-01
影响因子：
6.2
通讯作者：
K. A. Razak;A. Asadov;J. Yoo;E. Haemmerle;Wei Gao
中科院分区：
文献类型：
--
作者：
K. A. Razak;A. Asadov;J. Yoo;E. Haemmerle;Wei Gao
研究了水热法制备的 BaxSr1−xTiO3(BST) 的制备过程、结构和介电性能。通过高温水热合成制备了初始Ba组成分别为75、80、85和90mol.%的BST。将所得粉末压制成丸粒，冷等静压并在1200℃下烧结3小时。使用 X 射线衍射法分析所制备的粉末和烧结样品的相组成和晶格参数。使用拟合软件分析 XRD 谱以分离不同的相。结果发现，高温水热法制备的BST粉末具有两相结构。由于相互扩散，这种结构在烧结过程中变得更加均匀，但仍然可以追踪到少量的次要相。样品经历了异常的晶粒生长，由于两相结构的存在，一些晶粒比其他晶粒生长得更快。随着Ba含量的增加，晶粒尺寸增大。介电常数和极化随着Ba含量的增加而增加，但它也受到组合物的电子态和晶粒尺寸的影响。
The preparation procedure, structural and dielectric properties of hydrothermally derived BaxSr1−xTiO3(BST) were studied. BST with initial Ba compositions of 75, 80, 85 and 90mol.% were prepared by a high temperature hydrothermal synthesis. The obtained powders were pressed into pellet, cold isostatically pressed and sintered at 1200°C for 3 hours. The phase compositions and lattice parameters of the as prepared powders and sintered samples were analysed using X-ray diffractometry. A fitting software was used to analyse the XRD spectra to separate different phases. It was found that BST powder produced by the high temperature hydrothermal possessed a two-phase structure. This structure became more homogeneous during sintering due to interdiffusion but a small amount of minor phase can still be traced. Samples underwent an abnormal grain growth, whereby some grains grow faster than the other due to the presence of two-phase structure. The grain size increased with increasing Ba amount. Dielectric constant and polarisation increased with increasing Ba content but it was also affected by the electronic state and grain size of the compositions.