Ferroelectric Domains and Mechanical Size Effects in Barium Titanate: Do They Interact?
17 Pages Posted: 30 Oct 2019 First Look: Under Review
Microscale mechanical behaviour of single crystalline Barium Titanate (BaTiO3), a ferroelectric ceramic was studied by uniaxial in situ micropillar compression and nanoindentation. It was observed that pillars below 1 μm diameter reached the theoretical strength of BaTiO3 whereas larger pillars yielded at lower stress values with multiple stress drops confirming slip activity. A size scaling exponent of 0.96 ± 0.09 was estimated for BaTiO3 which is close to one of the soft fcc metals. The material's strength, hardness and deformation behaviour did not show any dependence on the character of the ferroelectric domain, within our error bars.
Keywords: Micropillar compression, Plastic deformation, Ferroelectric ceramics, Domains, Perovskite
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