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. 2019 Dec 30;12:13. doi: 10.1007/s40820-019-0346-1

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© The Author(s) 2019

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 17 — a Plot of fracture toughness versus hardness of BTC [126]. b Plot of hardness and c fracture toughness versus relative density [119, 179]. d Plot of hardness versus chord length of dense samples [180].

Figure panels reproduced from Ref. [126] with permission from IEEE copyright 2005, Ref. [119] with permission from Elsevier copyright 2006, Ref. [179] with permission from Elsevier copyright 2017, Ref. [180] with permission from EPMA copyright 2014