Novel Ca doped Sr0.7Bi0.2TiO3 lead-free relaxor ferroelectrics with high energy density and efficiency
Novel Ca doped Sr0.7Bi0.2TiO3 lead-free relaxor ferroelectrics with high energy density and efficiency
复制标题
具有高能量密度和效率的新型钙掺杂 Sr0.7Bi0.2TiO3 无铅弛豫铁电体
DOI：
10.1016/j.jeurceramsoc.2020.01.006
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发表时间：
2020-05
影响因子：
5.7
通讯作者：
Zhang Shuren
中科院分区：
文献类型：
--
作者：
Zhao Peng;Tang Bin;Si Feng;Yang Chengtao;Li Hao;Zhang Shuren
Sr0.7Bi0.2TiO3具有较高的弛豫性能和储能效率（η），有望在电力储能电容器中得到应用。然而，其能量存储密度受到相对较低的介电击穿强度（DBS）的限制。在此，制备Sr 0.7Bi 0.2CaxTiO 3（SBT-xC，x = 0 ~ 0.15）以减小Sr 0.7Bi 0.2TiO 3的平均晶粒尺寸。这可以有效地消除氧空位，降低电导率和漏电流，从而增强DBS。同时，Ca掺杂增加了弛豫行为和介电常数。当x = 0.1时，该复合材料具有480.2kV/cm的高DBS和优异的储能性能，如在290 kV/cm下的高储能密度为2.1J/cm 3，高η为97.6%，良好的热稳定性和良好的频率稳定性。此外，SBT-0.1C显示出50.1 MW/cm 3的高功率密度。这些结果表明，SBT-0.1C是高性能电介质储能应用的潜在候选者。
Sr0.7Bi0.2TiO3with high relaxor behavior and energy storage efficiency (η) is expected to be applied in power energy storage capacitors. However, its energy storage density is limited by the relatively low dielectric breakdown strength (DBS). Herein, Sr0.7Bi0.2CaxTiO3(SBT-xC, x = 0 ∼ 0.15) was prepared to decrease the average grain size of Sr0.7Bi0.2TiO3. This can effectively eliminate the oxygen vacancy and decrease the electrical conductivity and leakage current, which result in the enhanced DBS. Meanwhile, Ca doping increases the relaxor behavior and dielectric constant. When x = 0.1, the composition exhibits high DBS of 480.2 kV/cm and excellent energy storage properties, such as high energy storage density of 2.1 J/cm3with highηof 97.6 % at 290 kV/cm, considerable thermal stability and great frequency stability. Moreover, SBT-0.1C shows high power density of 50.1 MW/cm3. These results suggest that SBT-0.1C is a potential candidate for high performance dielectric energy storage applications.
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