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Bridging the Gap between Bulk Compression and Indentation Test on Room-Temperature Plasticity in Oxides: Case Study on SrTiO3

by Xufei Fang 1,*,†, Lukas Porz 1,†, Kuan Ding 1 and Atsutomo Nakamura 2,3,*
1
Department of Materials and Earth Sciences, Technical University of Darmstadt, 64287 Darmstadt, Germany
2
Department of Materials Physics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
3
PRESTO, Japan Science and Technology Agency (JST), 7, Gobancho, Chiyoda-ku, Tokyo 102-0076, Japan
*
Authors to whom correspondence should be addressed.
Equal Contribution.
Crystals 2020, 10(10), 933; https://doi.org/10.3390/cryst10100933
Received: 19 September 2020 / Revised: 8 October 2020 / Accepted: 12 October 2020 / Published: 14 October 2020
(This article belongs to the Special Issue Crystal Plasticity)
Dislocation-based functionalities in inorganic ceramics and semiconductors are drawing increasing attention, contrasting the conventional belief that the majority of ceramic materials are brittle at room temperature. Understanding the dislocation behavior in ceramics and advanced semiconducting materials is therefore critical for the mechanical reliability of such materials and devices designed for harvesting the dislocation-based functionalities. Here we compare the mechanical testing between indentation at nano-/microscale and bulk uniaxial deformation at macroscale and highlight the dislocation plasticity in single crystal SrTiO3, a model perovskite. The similarities and differences as well as the advantages and limitations of both testing protocols are discussed based on the experimental outcome of the crystal plasticity, with a focus on the pre-existing defect population being probed with different volumes across the length scales (“size effect”). We expect this work to pave the road for studying dislocation-based plasticity in various advanced functional ceramics and semiconductors. View Full-Text
Keywords: dislocation plasticity; ceramics; SrTiO3; nanoindentation; bulk deformation dislocation plasticity; ceramics; SrTiO3; nanoindentation; bulk deformation
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MDPI and ACS Style

Fang, X.; Porz, L.; Ding, K.; Nakamura, A. Bridging the Gap between Bulk Compression and Indentation Test on Room-Temperature Plasticity in Oxides: Case Study on SrTiO3. Crystals 2020, 10, 933.

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