Synthesis, dielectric and nonlinear electrical properties of Naub>1/2 ub>Biub>1/2 ub>Cuub>3 ub>Tiub>4 ub>Oub>12 ub> ceramics by a sol-gel technique
- 作者：Bin Xu
- 关键词：Bi1/2Na1/2Cu3Ti4O12 ; Dielectric constant ; Ceramics ; Sol&ndash ; gel
- 刊名：Materials Letters
- 出版年：2012
- 期刊代码：59_0167577x
- 类别：ms
- 出版时间：15 May, 2012
- 卷：75
- 期：Complete
- 页码：87-90
- 文件大小：680 K
摘要
The Biub>1/2 ub>Naub>1/2 ub>Cuub>3 ub>Tiub>4 ub>Oub>12 ub> (BNCTO) ceramics have been synthesized by a sol-gel technique, which were sintered at temperatures of 800 掳C, 900 掳C, 950 掳C and 1000 掳C for 3 hours. X-ray diffraction reveals that phase-pure BNCTO can be synthesized by this method with no impurity is found. It shows that, the dielectric and nonlinear electrical properties of the samples are strongly dependent on the sintering temperatures. With the sintering temperature increases, the dielectric constant value increases and the loss tangent decreases in the frequency range of 10up>4 up>-10up>6 up> Hz. Similar to the CaCuub>3 ub>Tiub>4 ub>Oub>12 ub>-based compound, the BNCTO ceramics also exhibit remarkably strong nonlinear current-voltage characteristic, and the nonlinear coefficient increases monotonically with the increase of sintering temperature.