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. 2024 Feb 21;626(8000):779–784. doi: 10.1038/s41586-024-07036-5

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© The Author(s) 2024

Open Access This 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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Extended Data Fig. 9 — a-c, Distribution of twist angles in the ceramics sintered at 1,650 °C (a), 1,750 °C (b), and 1,850 °C (c). The distribution of twist angle is similar as that of SPS sintered samples, concentrated around 38°, 28°, 18°, 12°, and 7°. d-f, Thickness of nanoslices in ceramics sintered at 1,650 °C (d), 1,750 °C (e), and 1,850 °C (f). g, Percentage variation of twist angles with sintering temperature. As the sintering temperature increases, the proportion of 27.8° and 38.2° gradually increased. h, Average thickness of nanoslices in ceramics sintered at different temperature. As the sintering temperature increases, the average thickness of nanoslices increases from 3 layers to 9 layers, which is slightly less than that of SPS sintered ceramics. i, Relationships between the nanoslice thickness and the strength/strain of TS-BN ceramics. With the nanoslice thickness increases, the strength and fracture strain of ceramics gradually decrease. The distribution of twist angles, the percentage change of twist angles, and the variation of nanoslice thickness with sintering temperature, as well as the relationship between nanoslice thickness and the strength/strain of hot-pressing sintered ceramics, are similar to the situation in SPS sintered ceramics. This shows that pressure, temperature, and holding time are the key factors controlling the microstructure and properties of TS-BN ceramics; effects of electronic current applied in SPS synthesis are negligible.