Fundamentals of the electret state and the interfacial origin of piezoelectricity

Author

Lewis, T.J.

Author_Institution

Inst. of Molecular & Biomolecular Electron., Univ. of Wales, Bangor, UK

fYear

1994

fDate

7-9 Sep 1994

Firstpage

3

Lastpage

12

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrets, 1994. (ISE 8), 8th International Symposium on

Conference_Location

Paris

Print_ISBN

0-7803-1940-0

Type

conf

DOI

10.1109/ISE.1994.514735

Filename

514735