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Driving forces on domain walls in ferroelectric materials and interaction with defects

Mueller, Ralf and Gross, Dietmar and Lupascu, Doru C. (2006):
Driving forces on domain walls in ferroelectric materials and interaction with defects.
In: Computational Materials Science, pp. 42-52, 35, (1), ISSN 09270256, [Online-Edition: http://dx.doi.org/10.1016/j.commatsci.2005.02.014],
[Article]

Abstract

The driving force on a domain wall in a piezoelectric material is identified by using a variational principle. In addition to the domain wall, point defects are considered. These defects are modeled as electrically charged centers of dilatation (or contraction). For representative numerical simulations, the finite element method (FEM) is used. The simulations allow the analysis of the interaction of point defects and domain walls. It is found that point defects have the ability to reduce the driving force on the domain wall. This can potentially lead to the hindering of the domain wall mobility which is suspected to be a mechanism in electric fatigue.

Item Type: Article
Erschienen: 2006
Creators: Mueller, Ralf and Gross, Dietmar and Lupascu, Doru C.
Title: Driving forces on domain walls in ferroelectric materials and interaction with defects
Language: English
Abstract:

The driving force on a domain wall in a piezoelectric material is identified by using a variational principle. In addition to the domain wall, point defects are considered. These defects are modeled as electrically charged centers of dilatation (or contraction). For representative numerical simulations, the finite element method (FEM) is used. The simulations allow the analysis of the interaction of point defects and domain walls. It is found that point defects have the ability to reduce the driving force on the domain wall. This can potentially lead to the hindering of the domain wall mobility which is suspected to be a mechanism in electric fatigue.

Journal or Publication Title: Computational Materials Science
Volume: 35
Number: 1
Uncontrolled Keywords: Piezoelectric material; Domain wall; Point defect; Driving force; Material force; Configurational force; Energy–momentum tensor; Eshelby tensor
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
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 > B - Characterisation
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue > B - Characterisation > Subproject B5: Model experiments about interactions between ferroelectric domains with point defects and their agglomerates
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
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres
DFG-Collaborative Research Centres (incl. Transregio)
Date Deposited: 15 Aug 2011 11:09
Official URL: http://dx.doi.org/10.1016/j.commatsci.2005.02.014
Additional Information:

SFB 595 Cooperation B5, C3

Identification Number: doi:10.1016/j.commatsci.2005.02.014
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