Micro-scale damage tolerance studies in ferroelectric barium titanate thin films

Conference Dates

October 2 – 7, 2022


Barium Titanate (BTO) is a brittle, lead free ferroelectric and piezoelectric ceramic used in the miniature form in microscale electrical device applications as capacitors, actuators and sensors. During service this material system develops mechanical stresses due to thermal and electric loads acting on the system, which leads to the failure of the system due to cracking in the films or interface delamination. Micropillar compression revealed a size effect in strength with a size exponent close to 1 and an enhancement in elastic strain limit [1]. It also revealed strain accommodation by dislocation plasticity. However, signature of plastic deformation in compression (Figure 1a) does not necessarily translate to crack tip plasticity tension for brittle ceramics.

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