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Nature 430, 761-764 (12 August 2004) | doi:10.1038/nature02729;
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Bulk glasses and ultrahard nanoceramics based on alumina and rare-earth oxides
Although often regarded as a network-former in conventional silicate glasses, Al2O3 alone cannot be obtained as a bulk glass. Until now, glasses comprising continuously linked [AlOx] polyhedra have been prepared in only a few systems under very fast cooling conditions, which limits their dimensions to a few millimetres.
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