Author :
Bauer, Siegfried ; Bauer-Gogonea, Simona ; Dansachmüller, Mario ; Graz, Ingrid ; Leonhartsberger, Hans ; Salhofer, Harald ; Schwödiauer, Reinhard
Author_Institution :
Soft Matter Phys., Johannes Kepler Univ., Linz, Austria
Abstract :
Ferroelectrets are cellular dielectric materials with an internal bipolar electret charge that exhibit ferroelectric-like hysteresis and switching behavior. Ferroelectrets have found considerable interest for transducer applications, since they mimic piezoelectricity by their unusual electromechanical properties. They offer very high d33 transducer coefficients, comparable with ferroelectric ceramics and typically 20 times larger than that of ferroelectric polymers like PVDF. Ferroelectrets therefore offer a huge potential for the development of large area sensors, as well as for acoustical, ultrasonics, biomedical, underwater and nondestructive testing applications.
Keywords :
dielectric hysteresis; electrets; ferroelectric ceramics; ferroelectric switching; piezoelectric transducers; piezoelectricity; polymer films; cellular dielectric materials; d33 transducer coefficients; electromechanical properties; ferroelectrets; ferroelectric ceramics; ferroelectric like hysteresis; ferroelectric polymers; internal bipolar electret charge; mimic piezoelectricity; nondestructive testing; sensors; Acoustic transducers; Biomedical transducers; Ceramics; Dielectric materials; Electrets; Ferroelectric materials; Hysteresis; Piezoelectric transducers; Piezoelectricity; Ultrasonic transducers;
Conference_Titel :
Ultrasonics, 2003 IEEE Symposium on
Print_ISBN :
0-7803-7922-5
DOI :
10.1109/ULTSYM.2003.1293425
