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Interaction of point defects in piezoelectric materials : numerical simulations in the context of electric fatigue

Goy, Oliver ; Müller, Ralf ; Gross, Dietmar :
Interaction of point defects in piezoelectric materials : numerical simulations in the context of electric fatigue.
In: Journal of theoretical and applied mechanics, 44 (4) pp. 819-836.
[Artikel], (2006)
Note:

SFB 595 C3

Kurzbeschreibung (Abstract)

The paper is concerned with the problem of electric fatigue in functional materials such as piezoelectric sensors and actuators. The fatigue degrades electromechanical properties with an increasing number of working cycles during which ionic and electronic charge carriers interact with each other within the bulk and on the interfaces of a material. This, in turn, influences local electric and mechanical fields coupled via the piezoelectric effect. It is assumed in the paper that the electric charges (vacancies) can be modelled as point defects, which tend to agglomerate and finally form clusters, espe- cially in the vicinity of electrodes. As a result, the piled up defects affect the distribution of polarisation. To solve the problem quantitatively, the analy- sed system is discretised with a grid of square cells and then transformed by FFT. Several numerical examples are formulated. Migration of a single defect, attraction of two and clustering of more point defects are thoroughly discussed and illustrated in the paper.

Typ des Eintrags: Artikel
Erschienen: 2006
Autor(en): Goy, Oliver ; Müller, Ralf ; Gross, Dietmar
Titel: Interaction of point defects in piezoelectric materials : numerical simulations in the context of electric fatigue
Sprache: Englisch
Kurzbeschreibung (Abstract):

The paper is concerned with the problem of electric fatigue in functional materials such as piezoelectric sensors and actuators. The fatigue degrades electromechanical properties with an increasing number of working cycles during which ionic and electronic charge carriers interact with each other within the bulk and on the interfaces of a material. This, in turn, influences local electric and mechanical fields coupled via the piezoelectric effect. It is assumed in the paper that the electric charges (vacancies) can be modelled as point defects, which tend to agglomerate and finally form clusters, espe- cially in the vicinity of electrodes. As a result, the piled up defects affect the distribution of polarisation. To solve the problem quantitatively, the analy- sed system is discretised with a grid of square cells and then transformed by FFT. Several numerical examples are formulated. Migration of a single defect, attraction of two and clustering of more point defects are thoroughly discussed and illustrated in the paper.

Titel der Zeitschrift, Zeitung oder Schriftenreihe: Journal of theoretical and applied mechanics
Band: 44
(Heft-)Nummer: 4
Freie Schlagworte: functional materials, piezoelectricity, electric fatigue, point defect
Fachbereich(e)/-gebiet(e): Fachbereich Bau- und Umweltingenieurwissenschaften, Civil and Environmental Engineering
Zentrale Einrichtungen > Sonderforschungsbereich 595 > C - Modellierung > C3
Zentrale Einrichtungen > Sonderforschungsbereich 595 > C - Modellierung
Zentrale Einrichtungen > Sonderforschungsbereich 595
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Hinterlegungsdatum: 20 Nov 2008 08:25
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SFB 595 C3

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