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Unexpected crystal structures: The noble-metal pernitrides OsN2 and IrN2 are found to adopt structure types never before observed in nitrides (see picture; Os/Ir blue, N green). Furthermore, the crystal structures of RuN2 and RhN2, which have yet to be synthesized, are predicted. A pressure-induced displacive phase transition and a semiconductor–metal transition are predicted for IrN2.
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Yu et al. (2006) studied this question.
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