Extreme reaction conditions lead to the synthesis of γ-P3N5. Its crystal structure (see picture), unlike that of the normal pressure modification α-P3N5, is not exclusively built from PN4 tetrahedra, but from both PN4 tetrahedra (blue) and tetragonal PN5 pyramids (red). A tetragonal PN5 pyramid structure element has not been observed previously.
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Landskron et al. (2001) studied this question.
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