Optimizing the defect chemistry of Na1/2Bi1/2TiO3-based materials: paving the way for excellent high temperature capacitors
Optimizing the defect chemistry of Na1/2Bi1/2TiO3-based materials: paving the way for excellent high temperature capacitors
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DOI：
10.1039/c8tc01010b
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发表时间：
2018-05-07
影响因子：
6.4
通讯作者：
Froemling, Till
中科院分区：
文献类型：
--
作者：
Hoefling, Marion;Steiner, Sebastian;Froemling, Till
对于汽车、航空和可再生能源行业中的应用，电子元件的温度和功率要求已显著增加。特别是，电容器已被确定为考虑满足这些要求的最关键的材料。陶瓷是最有前途的高温电容器材料，但迄今为止还没有陶瓷能够满足必要的电性能。在这项工作中，研究了Na 1/2Bi 1/2 TiO 3（NBT）固溶体以优化各自的电学性能。通过增加初始Bi含量来减少铋空位和氧空位浓度导致介电损耗的显著降低。此外，对于组成Na 1/2Bi 1/2 O3-BaTiO 3-CaZrO 3（NBT-BT-CZ）和稳定的高介电常数以及低介电损耗（tan δ）的温度范围，可以实现高达97%的能量效率
For applications in automotive, aviation and renewable energy industries temperature and power requirements have been significantly increased for electronic components. In particular, capacitors have been identified as the most critical materials considering the fulfillment of these requirements. Ceramics are the most promising materials for high temperature capacitors but no ceramic has been able to meet the necessary electrical properties so far. In this work, Na1/2Bi1/2TiO3 (NBT) solid solutions are investigated to optimize the respective electrical properties. A reduction of bismuth vacancy and oxygen vacancy concentration by increasing the initial Bi content leads to a significant decrease in dielectric loss. Additionally, energy efficiencies of up to 97% can be achieved for the composition Na1/2Bi1/2O3-BaTiO3-CaZrO3 (NBT-BT-CZ) and the temperature range of stable high permittivity together with low dielectric loss (tan delta