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  4. What do we know about surface charges on cracks in ferroelectric ceramics?
 
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What do we know about surface charges on cracks in ferroelectric ceramics?

Citation Link: https://doi.org/10.15480/882.1031
Publikationstyp
Conference Paper
Date Issued
2010
Sprache
English
Author(s)
Engert, Andrea Raphaela  
Felten, Frank  
Jelitto, Hans  
Schneider, Gerold A.  
Institut
Keramische Hochleistungswerkstoffe M-9  
TORE-DOI
10.15480/882.1031
TORE-URI
http://tubdok.tub.tuhh.de/handle/11420/1033
Citation
IUTAM Symposium on Multiscale Modelling of Fatigue, Damage and Fracture in Smart Materials
The present work investigates the static and time dependent electric potential distribution around cracks in a poled ferroelectric ceramic by Kelvin Probe Force Microscopy (KFM). In a first step a Vickers indentation crack in poled lead zirconate titanate (PZT) was subjected to static electric fields of up to 500 V/mm in poling direction, and the potential distribution around the crack as measured. In a second step, the polarity of the applied voltage was reversed against the poling direction during the measurement of the potential. Using a simple model, an effective dielectric constant of the crack, as well as the surface charge density on the crack face were calculated as a function of the distance from the crack tip, the applied field and the time. The results are discussed with reference to free charges on the crack surface, electrically induced domain switching at the crack tip and crack bridging.
Subjects
ferroelectric ceramics
fracture electrics
crack advance
lead zirconate titanate
dielectric constant
permittivity
DDC Class
620:Engineering and allied operations
Lizenz
http://doku.b.tu-harburg.de/doku/lic_mit_pod.php
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