Optimisation of SrBi2(Nb,Ta)2O9 Aurivillius phase for lead-free electrocaloric cooling
Optimisation of SrBi2(Nb,Ta)2O9 Aurivillius phase for lead-free electrocaloric cooling
复制标题
用于无铅电热冷却的 SrBi2(Nb,Ta)2O9 Aurivilius 相的优化
DOI：
10.1016/j.jeurceramsoc.2018.07.044
复制
发表时间：
2018
影响因子：
5.7
通讯作者：
Axelsson A
中科院分区：
文献类型：
--
作者：
Axelsson A
研究了不同替代机制对无铅SrBi_2（Nb_（0.2）Ta_（0.8））_2O_9 Aurivillius相电热效应的影响。用钡取代A位有效地将最大介电常数的温度从约300 °C降低到100 °C。A位取代引起的现象，是典型的强弛豫铁电体，如显着加宽的介电常数峰和增加其频率色散和与退极化温度低于室温。这些特征直接影响电热效应。采用改进的差示扫描量热仪直接测量系统对致密（Sr0.5Ba0.5）Bi2（Nb0.2Ta0.8）2O9陶瓷的电致变色效应进行了研究。根据弛豫特性，发现EC效应在室温以上的宽温度范围内连续增加。这归因于场致极性纳米畴的排列。确定了高性能EC陶瓷的优化方向。
The influence of different substitutional mechanisms on the electrocaloric effect of a lead-free SrBi2(Nb0.2Ta0.8)2O9Aurivillius phase was studied for application in electrocaloric cooling systems. The A-site substitution with barium efficiently reduced the temperature of maximum permittivity from about 300 °C to 100 °C. The A-site substitution induced phenomena that are typical of strong relaxor ferroelectrics such as significant broadening of the permittivity peak and an increase in its frequency dispersion and with a depolarization temperature below room temperature. These features directly influenced the electrocaloric effect. A direct measurement system, based on a modified-differential scanning calorimeter, was used to analyze the EC effect of the dense (Sr0.5Ba0.5)Bi2(Nb0.2Ta0.8)2O9ceramics. In accordance with the relaxor characteristics, the EC effect was found to increase continuously over a broad temperature range above the room temperature. This was attributed to the alignment of field induced polar nanodomains. Directions for optimization towards a high-performing EC ceramic were identified.
DOI：
--
发表时间：
2001
期刊：
影响因子：
--
作者：
H. Nagata;Takeshi Takahashi;Y. Yano;T. Takenaka
通讯作者：
T. Takenaka
SrBi2−xSmxNb2O9 (x=0、0.05、0.1、0.2、0.3 和 0.4) 陶瓷的介电和压电性能
DOI：
--
发表时间：
2007
期刊：
影响因子：
--
作者：
Lin Sun;Chude Feng;Lidong Chen;Shi
通讯作者：
Shi