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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
(a) Representative room temperature compression stress–strain curve. (b) Typical macro-image of a test sample showing 45° fracture relative to the compression axis. (c,d) SEM morphology of fracture surface with cleavage bands.