Title :
Fundamentals of the electret state and the interfacial origin of piezoelectricity
Author_Institution :
Inst. of Molecular & Biomolecular Electron., Univ. of Wales, Bangor, UK
Abstract :
Beginning with the Gibbs´ thermodynamic equation for electrocapillary action at a charged interface between two phases, it is possible to derive an interfacial model for piezoelectricity. This model is applied to the situation in a poled material like PVDF where the synergistic interaction between polarization in the crystallite phases and trapped charge in the amorphous phases leads to a system of charged interfaces which not only stabilize the polarization but also become the sources of piezoelectricity
Keywords :
carrier mobility; dielectric polarisation; electrets; ferroelectric materials; free energy; interface phenomena; piezoelectric materials; polymers; Gibbs´ thermodynamic equation; PVDF; amorphous phases; charged interface; crystallite phases; electret state; electrocapillary action; interfacial origin; piezoelectricity; polarization; poled material; synergistic interaction; trapped charge; Capacitive sensors; Electrets; Equations; Ferroelectric materials; Piezoelectric polarization; Piezoelectricity; Polymers; Solids; Stress; Thermodynamics;
Conference_Titel :
Electrets, 1994. (ISE 8), 8th International Symposium on
Conference_Location :
Paris
Print_ISBN :
0-7803-1940-0
DOI :
10.1109/ISE.1994.514735
