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Title: What do we know about surface charges on cracks in ferroelectric ceramics?
Language: English
Authors: Engert, Andrea Raphaela 
Felten, Frank 
Jelitto, Hans 
Schneider, Gerold A. 
Keywords: Bruchelektrik;ferroelektrische Keramik;Blei-Zirkonat-Titanat;PZT;Dielektrizitätskonstante;ferroelectric ceramics;fracture electrics;crack advance;lead zirconate titanate;dielectric constant;permittivity
Issue Date: 2010
Source: IUTAM Symposium on Multiscale Modelling of Fatigue, Damage and Fracture in Smart Materials
Abstract (english): 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.
DOI: 10.15480/882.1031
Institute: Keramische Hochleistungswerkstoffe M-9 
Type: InProceedings (Aufsatz / Paper einer Konferenz etc.)
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