Materials Data on Si2CN4 by Materials Project
Si2CN4 crystallizes in the orthorhombic Aea2 space group. The structure is three-dimensional. Si4+ is bonded to four N3- atoms to form corner-sharing SiN4 tetrahedra. There is one shorter (1.70 Å) and three longer (1.74 Å) Si–N bond length. C4+ is bonded in a linear geometry to two equivalent N3- atoms. Both C–N bond lengths are 1.21 Å. There are two inequivalent N3- sites. In the first N3- site, N3- is bonded in a linear geometry to one Si4+ and one C4+ atom. In the second N3- site, N3- is bonded in a trigonal planar geometry to three equivalent Si4+ atoms.
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