High-accuracy characterization of pyroelectric materials:A noncontact method based on surface potential measurements  

作　　者：Reinhard Schwödiauer Simona Bauer-Gogonea Martin Kaltenbrunner Volodymyr Tkachenko Simonetta Grilli 

机构地区：[1]Soft Matter Physics,Johannes Kepler University,Altenbergerstraße 69,4040 Linz,Austria [2]Institute of Applied Sciences&Intelligent Systems,National Research Council(CNR-ISASI)Via Campi Flegrei 34,80078 Pozzuoli(NA),Italy

出　　处：《Journal of Advanced Dielectrics》2023年第4期52-59,共8页先进电介质学报（英文）

基　　金：supported by the European Horizon 2020 grant“SensApp”under Grant Agreement No.829104.

摘　　要：The characterization of pyroelectric materials is essential for the design of pyroelectric-based devices.Pyroelectric current measurement is the commonly employed method,but can be complex and requires surface electrodes.Here,we present noncontact electrostatic voltmeter measurements as a simple but highly accurate alternative,by assessing thermally-induced pyroelectric surface potential variations.We introduce a refined model that relates the surface potential variations to both the pyroelectric coefficient and the characteristic figure of merit(FOM)and test the model with square-shaped samples made from PVDF,LiNbO3 and LiTaO3.The characteristic pyroelectric coefficient for PVDF,LiNbO3 and LiTaO3 was found to be 33.4,59.9 and 208.4μC m−2 K−1,respectively.These values are in perfect agreement with literature values,and they differ by less than 2.5%from values that we have obtained with standard pyroelectric current measurements for comparison.

关 键 词：Pyroelectric coefficient surface potential figure of merit 

分 类 号：TB30[一般工业技术—材料科学与工程]