Dielectric behavior and impedance spectroscopy in lead-free BNT-BT-NBN perovskite ceramics for energy storage
Dielectric behavior and impedance spectroscopy in lead-free BNT-BT-NBN perovskite ceramics for energy storage
复制标题
用于储能的无铅 BNT-BT-NBN 钙钛矿陶瓷的介电行为和阻抗谱
DOI：
10.1016/j.ceramint.2016.03.062
复制
发表时间：
2016
影响因子：
5.2
通讯作者：
Liu Hanxing
中科院分区：
文献类型：
--
作者：
Xu Qi;Lanagan Michael T.;Huang Xuechen;Xie Juan;Zhang Lin;Hao Hua;Liu Hanxing
研究了0.85[（1−x）Bi0.5Na0.5TiO3-xBaTiO 3]-0.15Na0.73Bi0.09NbO3[（BNT-xBT）-NBN]三元陶瓷的介电行为、阻抗谱和储能性能。介电常数随温度变化的曲线显示两个凹陷的异常，导致显着改善的介电温度稳定性。（BNT-9 BT）-NBN在150 °C下显示出1680的介电常数，其中Δε/ε150 ° C变化不超过±10%直至340 °C。复阻抗分析表明，晶粒和晶界具有相同的时间常数。高温电阻率服从Arrhenius定律，Ea =1.7- 2.0eV，表明其为本征带型电子导电。所有样品的最大储能密度均达到1.1-1.4 J/cm ~ 3，在25-140 °C范围内具有良好的温度稳定性。这些结果表明，（BNT-xBT）-NBN系统应该是一个有前途的无铅储能电容器应用材料。
The dielectric behavior, impedance spectroscopy and energy-storage properties of 0.85[(1−x)Bi0.5Na0.5TiO3–xBaTiO3]–0.15Na0.73Bi0.09NbO3[(BNT–xBT)–NBN] ternary ceramics were investigated. Temperature dependent permittivity curves displayed two depressed anomalies, resulting in significantly improved dielectric temperature stability. (BNT–9BT)–NBN showed a permittivity of 1680 at 150 °C with Δε/ε150 °Cvarying no more than ±10% up to 340 °C. From the complex impedance analysis, grain and grain boundary shared the same time constant. The high temperature resistivity followed the Arrhenius law withEa=1.7–2.0 eV, suggesting intrinsic band-type electronic conduction. The maximum energy-storage density of all the samples reached 1.1–1.4 J/cm3, accompanied with good temperature stability in the range of 25–140 °C. These results indicate that (BNT–xBT)–NBN system should be a promising lead-free material for energy-storage capacitor applications.