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

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

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.

Item Type: Article
Erschienen: 2006
Creators: Goy, Oliver and Müller, Ralf and Gross, Dietmar
Title: Interaction of point defects in piezoelectric materials : numerical simulations in the context of electric fatigue
Language: English
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.

Journal or Publication Title: Journal of theoretical and applied mechanics
Journal volume: 44
Number: 4
Uncontrolled Keywords: functional materials, piezoelectricity, electric fatigue, point defect
Divisions: 13 Department of Civil and Environmental Engineering Sciences
DFG-Collaborative Research Centres (incl. Transregio)
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres
Zentrale Einrichtungen
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue > C - Modelling
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue > C - Modelling > Subproject C3: Microscopic investigations into defect agglomeration and its effect on the mobility of domain walls
Date Deposited: 20 Nov 2008 08:25
Additional Information:

SFB 595 C3

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