Müller, Ralf; Schröder, Jörg; Lupascu, Doru C.:
Thermodynamic consistent modelling of defects and microstructures in ferroelectrics
2008
In: GAMM-Mitteilungen, Jg. 31 (2008), Heft 2, S. 133 - 150
Artikel/Aufsatz in Zeitschrift / Fach: Bauwissenschaften
Titel:
Thermodynamic consistent modelling of defects and microstructures in ferroelectrics
Autor(in):
Müller, Ralf; Schröder, Jörg im Online-Personal- und -Vorlesungsverzeichnis LSF anzeigen; Lupascu, Doru C. im Online-Personal- und -Vorlesungsverzeichnis LSF anzeigen
Erscheinungsjahr
2008
Erschienen in:
GAMM-Mitteilungen, Jg. 31 (2008), Heft 2, S. 133 - 150
ISSN
DOI

Abstract:

The paper describes the main phenomena associated with fatigue in ferroelectricmaterials due to defects and microstructural effects. An analysis the modelling on different length scales is presented. Starting from a thermodynamic analysis of the macroscopic material behavior other microscopic aspects are addressed. The introduction of an orientation distribution function allows for a computationally efficient extension of a single crystal model to realistic 3D structures. Additionally, the thermodynamic treatment of defects and domain wall motion is discussed to provide a better understanding of various micro-mechanisms. It is explained by the concept of configurational/driving forces, how defects influence each other and how the mobility of domain walls is reduced in the presence of defects.