Enhanced Piezoelectric Properties of CaBi2Nb2O9 with Eu Modification and Templated Grain Growth
Calcium bismuth niobate (CaBi2Nb2O9,CBN) is a high Curie temperature (Tc) piezoelectric material,however,their piezoelectric properties are very poor.In order to improve the piezoelectric performance of CBN,the Eu modification and texture method (templated grain growth,TGG) were applied in this material system.The piezoelectric properties of CBN ceramics were significantly enhanced by Eu modification.The 5mol% Eu dopants in CBN ceramics have a higher piezoelectric constant and higher Tc (d33=12.8pC/N,Tc=945℃) than that of undoped CBN ceramics (d33=6.2pC/N,Tc=930℃).Highly textured 5mol% Eu doped CBN ceramics with 92% Lotgering factor were obtained by the TGG technique.The piezoelectric properties of textured and modified CBN ceramics are anisotropic on different directions of perpendicular (d33=0.1pC/N) and parallel (d33=20.5pC/N) to tape stacking direction.Furthermore,they had excellent thermostable piezoelectric properties from room temperature to near Curie temperature.The textured Eu modified CBN ceramics with high Tc and high piezoelectric properties might be a promising candidate for high-temperature piezoelectric applications.
Bismuth layered structure Europium Piezoelectric Textured ceramic
Huanbei Chen Jiwei Zhai
Functional Materials Research Laboratory,Tongji University,Siping Road,Shanghai 200092,China
国际会议
The Seventh China International Conference on High-Performance Ceramics (第七届先进陶瓷国际研讨会(CICC-7))
厦门
英文
1367-1371
2011-11-04（万方平台首次上网日期，不代表论文的发表时间）