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Third Order Nonlinear Dielectric Permitivities of Ferroelectric Ceramic/VDF-TrFE 0-3 Composite Materials
Zhang Xingyuan,Chan Wang Lihua,Cai Zhonglong
Author NameAffiliation
Zhang Xingyuan Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei 230026 
Chan Wang Lihua Department of Applied Physics and Materials Research Centre,The Hong Kong Polytechnic University, Hong Kong 
Cai Zhonglong Department of Applied Physics and Materials Research Centre,The Hong Kong Polytechnic University, Hong Kong 
Abstract:
A system for measuring nonlinear dielectric permittivity has been set up. The third order nonlinear dielectric permittivities of ferroelectric ceramic (PT, BT, PZT)/VDF-TrFE 0-3 composite thick films have been measured at the electric field ranging from 1 to 10 MV/m (f0= 1kHz) and at the temperature ranging from ambient temperature to 140℃ . It is found that the third order dielectric permittivity ε3 of three kinds of composite increases with the increase of ceramic volume fraction φ ε3 of the composite also shows a dependence on electric field. A higher electric field produces a lower ε3, but BT/P[VDF(70)-TrFE(30)] and PZT/P[VDF(77)-TrFE(23)] whose φ is higher than 0.4 show a minimum at 6MV/m of electric field.ε3 of the composite which two phases being poled is less than that of the composite which only the ceramic phase being poled. The temperature spectra of ε3 for PZT/P[VDF(77)-TrFE(23)] also produces an apparent thermal hysteresis phenomenon similar to that of ε1.
Key words:  VDF-TrFE copolymer, Ferroelectric composite,Third order nonlinear dielectric permittivity
FundProject:国家自然科学基金、香港RGC和香港理工大学资助项目
陶瓷/VDF-TrFE 0-3型铁电复合物的三阶非线性介电系数
张兴元,陈王丽华,蔡忠龙
摘要:
在自建的非线性介电测试装置上测得了PT,BT、PZT和VDF-TrFE共聚物形成的0-3型铁电复合物厚片的三阶非线性介电系数ε3.研究发现,三种复合物的ε3都随陶瓷组分含量的上升而增大.测试场强升高,测得的ε3值减小,但对高陶瓷含量(φ>0.4)的BT/VDF-TrFE和PZT/VDF-TrFE复合物则在6MV/m场强下出现极小值.二相都被预极化的复合物小于仅陶瓷相被预极化的ε3值.PZT/VDF-TrFE复合物的温度依赖关系显示了与(-阶)介电系数类似的表观热滞后现象.高PZT含量的复合物在相变区出现较
关键词:  VDF-TrFE共聚物铁电复合物三阶非线性介电系数
DOI:10.1088/1674-0068/13/2/249-256
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