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Symmetric Structures of Ultrahard Materials
Author(s) -
Lowther John E.
Publication year - 2002
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2002.tb00038.x
Subject(s) - hexagonal boron nitride , materials science , stishovite , diamond , boron nitride , phase (matter) , hexagonal crystal system , electronic structure , nanotechnology , chemical physics , quartz , crystallography , chemistry , graphene , composite material , computational chemistry , organic chemistry
Diamond and BN have common relatively soft precursor structures that are hexagonal. Electronic structure calculations have now revealed subtle energy differences between the two materials. Another hard material, stishovite, also has a relatively soft precursor phase, quartz, and here again electronic structure calculations have given insight into the nature of the phase transformation. On the other hand, with boron‐related materials, the main focus is to connect basic icosahedra structures to produce a hard material. The structural aspects of these materials are examined and possible consequences for low‐ and high‐coordination ultrahard nitrides considered.