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Published online 5 May 2000 | Nature | doi:10.1038/news000511-1

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Crunchy filling

Researchers may have spotted an elusive 'superhard' material between the layers of an atomic-scale sandwich, Philip Ball reports.

An international team of scientists may have tracked down one of the most eagerly hunted substances of recent years. Called 'beta-carbon nitride', this material was predicted in 1989 to be as hard as, or possibly even harder than, diamond, the hardest known substance.

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