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Conducting crack propagation driven by electric fields in ferroelectric ceramics

Amir Abdollahi's picture

This is a recent article in Acta Materialia on the propagation of conducting cracks in ferroelectric ceramics

Title: Conducting crack propagation driven by electric fields in ferroelectric ceramics

Authors: Amir Abdollahi and Irene Arias, Universitat Politecnica de Catalunya (UPC), Barcelona

Abstract:

Ferroelectric ceramics are susceptible to fracture under high electric
fields, which are commonly generated in the vicinity of electrodes or
conducting layers. In the present work, we extend a phase-field model of
fracture in ferroelectric single crystals to the simulation of the
propagation of conducting cracks under purely electrical loading. This
is done by introducing the electrical enthalpy of a diffuse conducting
layer into the phase-field formulation. Simulation results show oblique
crack propagation and crack branching from a conducting notch, forming a
tree-like crack pattern in a ferroelectric sample under positive and
negative electric fields. Microstructure evolution indicates the
formation of tail-to-tail and head-to-head 90° domains, which results in
charge accumulation around the crack. The charge accumulation, in turn,
induces a high electric field and hence a high electrostatic energy,
further driving the conducting crack. Salient features of the results
are compared with experiments.

 

http://www.sciencedirect.com/science/article/pii/S1359645413005703#

 

                              

 

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