Study on Bi2O3 doping methods and dielectric property of (1 − x)BaTiO3–x(Bi0.5Na0.5)TiO3 ceramics
Study on Bi2O3 doping methods and dielectric property of (1 − x)BaTiO3–x(Bi0.5Na0.5)TiO3 ceramics
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DOI：
10.1016/j.jallcom.2010.01.160
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发表时间：
2010-04
影响因子：
6.2
通讯作者：
Ming-long Liu;De-an Yang;Y. Qu
中科院分区：
文献类型：
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作者：
Ming-long Liu;De-an Yang;Y. Qu
对bi2o3掺杂方法和（1−x） BaTiO3-x (Bi0.5Na0.5)TiO3（(1−x) BT-xBNT, x=0.01, 0.03, 0.05, 0.10, 0.15, 0.25mol）陶瓷的含量进行了广泛的研究。采用传统陶瓷工艺制备样品，分别以1:1:4和1.005:1:4 （Bi-excess）的摩尔比掺杂Bi2O3、Na2CO3和tio2，制得（Bi0.5Na0.5）TiO3。介电常数和损耗的温度依赖性表明（1−x） BT-xBNT陶瓷具有典型的弛豫行为和扩散相变特征，并且随着bnt掺杂浓度的增加，铁电弛豫行为的程度增强。此外，在100℃下，所有的tan - δ - t曲线都呈现出低而宽的平台。室温介电常数在x≤0.05mol时急剧下降，然后随x的增加而缓慢变化。当x≤0.15mol时，最大介电常数（Tm）的温度可以提高，当掺杂过量Bi2O3时，这种趋势更为明显。
Extensive studies on Bi2O3doping methods and contents of (1−x)BaTiO3–x(Bi0.5Na0.5)TiO3((1−x)BT–xBNT, x=0.01, 0.03, 0.05, 0.10, 0.15, 0.25mol) ceramics have been investigated. The samples were fabricated by the conventional ceramic process, while Bi2O3, Na2CO3, and TiO2were doped in the molar ratio of 1:1:4 and 1.005:1:4 (Bi-excess), respectively, to create (Bi0.5Na0.5)TiO3. The temperature dependence dielectric constant and loss revealed that (1−x)BT–xBNT ceramics had a typical relaxor behavior and diffuse phase transition characteristics and the degree of ferroelectric relaxation behavior was enhanced with the increase of BNT-dopant concentration. In addition, all the tanδ–T curves showed a low and broad platform under 100°C. The room temperature permittivity decreased sharply at x≤0.05mol and then they varied slowly with x increasing. The temperature of permittivity maximum (Tm) could be improved when x≤0.15mol and this tendency was more apparent when doped with excess Bi2O3.