Actas de congresos
The use of pulsed electric acoustic technique for measuring the polarization reversal in ferroelectric ceramic samples
Fecha
2002-01-01Registro en:
Conference on Electrical Insulation and Dielectric Phenomena (CEIDP), Annual Report, p. 899-902.
0084-9162
10.1109/CEIDP.2002.1048940
WOS:000179333500215
2-s2.0-0036438490
Autor
Universidade de São Paulo (USP)
Universidade Federal de São Carlos (UFSCar)
LACTEC
Universidade Estadual Paulista (Unesp)
Institución
Resumen
The pulsed electric acoustic technique, PEA, has been usually applied to probe space charge profiles in polymers. Preliminary PEA results using a ferroelectric ceramic are presented. If the reverse applied electric field i of the order of the coercive field the switching polarization process occurs in a period larger than hundreds of seconds. Such a slow process allows one to use the PEA setup to follow the polarization switching dynamics and determine the electric field profile. The PEA signal obtained in the lead zirconate-titanate doped with niobium ceramic, PZTN, indicates that the polarization distribution and field are not uniform during the switching period. We were also able to observe that the acoustic wave velocity and attenuation depends on the stage of the polarization switching, which agrees with results obtained using the ultrasonic method.