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What does 'Harder than diamond' mean?

Brazhkin, V. and Dubrovinskaia, N. and Nicol, M. and Novikov, N. and Riedel, Ralf and Solozhenko, V. and Zhao, Y. (2004):
What does 'Harder than diamond' mean?
3, In: Nature Materials, (9), Nature, pp. 576-577, ISSN 1476-1122, DOI: 10.1038/nmat1196,
[Online-Edition: https://doi.org/10.1038/nmat1196],
[Article]

Abstract

Syntheses of new classes of hard and superhard materials1,2,3 provide new challenges for the measurement of hardness. In the past, the criteria for such measurements were based on a careful comparison and semiquantitative appraisal of materials with respect to each other. The best example of this is the Mohs hardness scale, which categorizes materials in terms of their ability to scratch one another, with diamond at the top with a value of 10. But for materials that are purportedly harder than diamond, using such relative criteria become problematic, which in turn raises the question of what it means — in quantitative terms — for a material to be harder than diamond. This question was the subject of intense debate amongst delegates at a recent workshop on superhard materials*, and this correspondence summarizes the consensus of these discussions.

Item Type: Article
Erschienen: 2004
Creators: Brazhkin, V. and Dubrovinskaia, N. and Nicol, M. and Novikov, N. and Riedel, Ralf and Solozhenko, V. and Zhao, Y.
Title: What does 'Harder than diamond' mean?
Language: English
Abstract:

Syntheses of new classes of hard and superhard materials1,2,3 provide new challenges for the measurement of hardness. In the past, the criteria for such measurements were based on a careful comparison and semiquantitative appraisal of materials with respect to each other. The best example of this is the Mohs hardness scale, which categorizes materials in terms of their ability to scratch one another, with diamond at the top with a value of 10. But for materials that are purportedly harder than diamond, using such relative criteria become problematic, which in turn raises the question of what it means — in quantitative terms — for a material to be harder than diamond. This question was the subject of intense debate amongst delegates at a recent workshop on superhard materials*, and this correspondence summarizes the consensus of these discussions.

Journal or Publication Title: Nature Materials
Volume: 3
Number: 9
Publisher: Nature
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids
Date Deposited: 17 Dec 2018 11:45
DOI: 10.1038/nmat1196
Official URL: https://doi.org/10.1038/nmat1196
Additional Information:

1st International Workshop on Advanced Superhard Materials (IWASM) at Villetaneuse, France, 10–12 December, 2003.

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