Cr3Si6N11 crystallizes in the tetragonal P4bm space group. There are two inequivalent Cr sites. In the first Cr site, Cr(1) is bonded in a 5-coordinate geometry to one N(3), two equivalent N(1), and two equivalent N(2) atoms. In the second Cr site, Cr(2) is bonded in a 8-coordinate geometry to four equivalent N(1) and four equivalent N(2) atoms. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one N(2), one N(3), and two equivalent N(1) atoms to form corner-sharing SiN4 tetrahedra. In the second Si site, Si(2) is bonded to one N(3), one N(4), and two equivalent N(2) atoms to form distorted corner-sharing SiN4 tetrahedra. There are four inequivalent N sites. In the first N site, N(3) is bonded in a trigonal pyramidal geometry to one Cr(1), one Si(2), and two equivalent Si(1) atoms. In the second N site, N(4) is bonded in a linear geometry to two equivalent Si(2) atoms. In the third N site, N(1) is bonded in a distorted rectangular see-saw-like geometry to one Cr(1), one Cr(2), and two equivalent Si(1) atoms. In the fourth N site, N(2) is bonded in a 4-coordinate geometry to one Cr(1), one Cr(2), one Si(1), and one Si(2) atom.
Cr3Si6N11 crystallizes in the tetragonal P4bm space group. There are two inequivalent Cr sites. In the first Cr site, Cr(1) is bonded in a 5-coordinate geometry to one N(3), two equivalent N(1), and two equivalent N(2) atoms. The Cr(1)-N(3) bond length is 2.09 Å. Both Cr(1)-N(1) bond lengths are 2.11 Å. Both Cr(1)-N(2) bond lengths are 2.20 Å. In the second Cr site, Cr(2) is bonded in a 8-coordinate geometry to four equivalent N(1) and four equivalent N(2) atoms. All Cr(2)-N(1) bond lengths are 2.23 Å. All Cr(2)-N(2) bond lengths are 2.60 Å. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one N(2), one N(3), and two equivalent N(1) atoms to form corner-sharing SiN4 tetrahedra. The Si(1)-N(2) bond length is 1.69 Å. The Si(1)-N(3) bond length is 1.75 Å. There is one shorter (1.71 Å) and one longer (1.72 Å) Si(1)-N(1) bond length. In the second Si site, Si(2) is bonded to one N(3), one N(4), and two equivalent N(2) atoms to form distorted corner-sharing SiN4 tetrahedra. The Si(2)-N(3) bond length is 1.77 Å. The Si(2)-N(4) bond length is 1.63 Å. Both Si(2)-N(2) bond lengths are 1.75 Å. There are four inequivalent N sites. In the first N site, N(3) is bonded in a trigonal pyramidal geometry to one Cr(1), one Si(2), and two equivalent Si(1) atoms. In the second N site, N(4) is bonded in a linear geometry to two equivalent Si(2) atoms. In the third N site, N(1) is bonded in a distorted rectangular see-saw-like geometry to one Cr(1), one Cr(2), and two equivalent Si(1) atoms. In the fourth N site, N(2) is bonded in a 4-coordinate geometry to one Cr(1), one Cr(2), one Si(1), and one Si(2) atom.