The structure described by MgSi7N10 crystallizes in the monoclinic Pc space group. Mg(1) is bonded in a 4-coordinate geometry to one N(1), one N(3), one N(4), and one N(7) atom. There are seven inequivalent Si sites. In the first Si site, Si(1) is bonded to one N(1), one N(2), one N(3), and one N(6) atom to form a mixture of edge and corner-sharing SiN4 tetrahedra. In the second Si site, Si(2) is bonded to one N(2), one N(3), one N(4), and one N(6) atom to form a mixture of edge and corner-sharing SiN4 tetrahedra. In the third Si site, Si(3) is bonded to one N(4), one N(5), one N(7), and one N(8) atom to form corner-sharing SiN4 tetrahedra. In the fourth Si site, Si(4) is bonded to one N(10), one N(2), one N(7), and one N(9) atom to form corner-sharing SiN4 tetrahedra. In the fifth Si site, Si(5) is bonded to one N(1), one N(7), one N(8), and one N(9) atom to form corner-sharing SiN4 tetrahedra. In the sixth Si site, Si(6) is bonded to one N(10), one N(3), one N(5), and one N(8) atom to form corner-sharing SiN4 tetrahedra. In the seventh Si site, Si(7) is bonded to one N(10), one N(5), one N(6), and one N(9) atom to form corner-sharing SiN4 tetrahedra. There are ten inequivalent N sites. In the first N site, N(9) is bonded in a trigonal planar geometry to one Si(4), one Si(5), and one Si(7) atom. In the second N site, N(10) is bonded in a trigonal planar geometry to one Si(4), one Si(6), and one Si(7) atom. In the third N site, N(1) is bonded in a 3-coordinate geometry to one Mg(1), one Si(1), and one Si(5) atom. In the fourth N site, N(2) is bonded in a distorted trigonal planar geometry to one Si(1), one Si(2), and one Si(4) atom. In the fifth N site, N(3) is bonded to one Mg(1), one Si(1), one Si(2), and one Si(6) atom to form distorted corner-sharing NMgSi3 tetrahedra. In the sixth N site, N(4) is bonded in a distorted trigonal planar geometry to one Mg(1), one Si(2), and one Si(3) atom. In the seventh N site, N(5) is bonded in a trigonal planar geometry to one Si(3), one Si(6), and one Si(7) atom. In the eighth N site, N(6) is bonded in a trigonal planar geometry to one Si(1), one Si(2), and one Si(7) atom. In the ninth N site, N(7) is bonded to one Mg(1), one Si(3), one Si(4), and one Si(5) atom to form distorted corner-sharing NMgSi3 trigonal pyramids. In the tenth N site, N(8) is bonded in a trigonal planar geometry to one Si(3), one Si(5), and one Si(6) atom. is represented by the CIF file [CIF]
data_MgSi7N10
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.732
_cell_length_b   6.886
_cell_length_c   9.717
_cell_angle_alpha   90.000
_cell_angle_beta   105.150
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   434.773
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
  Mg  Mg0  1  0.995  0.931  0.696  1.0
  Mg  Mg1  1  0.995  0.069  0.196  1.0
  Si  Si2  1  0.541  0.979  0.823  1.0
  Si  Si3  1  0.541  0.021  0.323  1.0
  Si  Si4  1  0.349  0.022  0.018  1.0
  Si  Si5  1  0.349  0.978  0.518  1.0
  Si  Si6  1  0.110  0.398  0.072  1.0
  Si  Si7  1  0.110  0.602  0.572  1.0
  Si  Si8  1  0.662  0.361  0.992  1.0
  Si  Si9  1  0.662  0.639  0.492  1.0
  Si  Si10  1  0.843  0.618  0.809  1.0
  Si  Si11  1  0.843  0.382  0.309  1.0
  Si  Si12  1  0.298  0.619  0.882  1.0
  Si  Si13  1  0.298  0.381  0.382  1.0
  Si  Si14  1  0.484  0.368  0.686  1.0
  Si  Si15  1  0.484  0.632  0.186  1.0
  N  N16  1  0.749  0.848  0.812  1.0
  N  N17  1  0.749  0.152  0.312  1.0
  N  N18  1  0.558  0.133  0.971  1.0
  N  N19  1  0.558  0.867  0.471  1.0
  N  N20  1  0.310  0.871  0.862  1.0
  N  N21  1  0.310  0.129  0.362  1.0
  N  N22  1  0.151  0.159  0.039  1.0
  N  N23  1  0.151  0.841  0.539  1.0
  N  N24  1  0.289  0.507  0.722  1.0
  N  N25  1  0.289  0.493  0.222  1.0
  N  N26  1  0.443  0.121  0.670  1.0
  N  N27  1  0.443  0.879  0.170  1.0
  N  N28  1  0.885  0.379  0.133  1.0
  N  N29  1  0.885  0.621  0.633  1.0
  N  N30  1  0.076  0.570  0.935  1.0
  N  N31  1  0.076  0.430  0.435  1.0
  N  N32  1  0.700  0.414  0.825  1.0
  N  N33  1  0.700  0.586  0.325  1.0
  N  N34  1  0.499  0.541  0.022  1.0
  N  N35  1  0.499  0.459  0.522  1.0
[/CIF]
.
The structure described by MgSi7N10 crystallizes in the monoclinic Pc space group. Mg(1) is bonded in a 4-coordinate geometry to one N(1), one N(3), one N(4), and one N(7) atom. There are seven inequivalent Si sites. In the first Si site, Si(1) is bonded to one N(1), one N(2), one N(3), and one N(6) atom to form a mixture of edge and corner-sharing SiN4 tetrahedra. In the second Si site, Si(2) is bonded to one N(2), one N(3), one N(4), and one N(6) atom to form a mixture of edge and corner-sharing SiN4 tetrahedra. In the third Si site, Si(3) is bonded to one N(4), one N(5), one N(7), and one N(8) atom to form corner-sharing SiN4 tetrahedra. In the fourth Si site, Si(4) is bonded to one N(10), one N(2), one N(7), and one N(9) atom to form corner-sharing SiN4 tetrahedra. In the fifth Si site, Si(5) is bonded to one N(1), one N(7), one N(8), and one N(9) atom to form corner-sharing SiN4 tetrahedra. In the sixth Si site, Si(6) is bonded to one N(10), one N(3), one N(5), and one N(8) atom to form corner-sharing SiN4 tetrahedra. In the seventh Si site, Si(7) is bonded to one N(10), one N(5), one N(6), and one N(9) atom to form corner-sharing SiN4 tetrahedra. There are ten inequivalent N sites. In the first N site, N(9) is bonded in a trigonal planar geometry to one Si(4), one Si(5), and one Si(7) atom. In the second N site, N(10) is bonded in a trigonal planar geometry to one Si(4), one Si(6), and one Si(7) atom. In the third N site, N(1) is bonded in a 3-coordinate geometry to one Mg(1), one Si(1), and one Si(5) atom. In the fourth N site, N(2) is bonded in a distorted trigonal planar geometry to one Si(1), one Si(2), and one Si(4) atom. In the fifth N site, N(3) is bonded to one Mg(1), one Si(1), one Si(2), and one Si(6) atom to form distorted corner-sharing NMgSi3 tetrahedra. In the sixth N site, N(4) is bonded in a distorted trigonal planar geometry to one Mg(1), one Si(2), and one Si(3) atom. In the seventh N site, N(5) is bonded in a trigonal planar geometry to one Si(3), one Si(6), and one Si(7) atom. In the eighth N site, N(6) is bonded in a trigonal planar geometry to one Si(1), one Si(2), and one Si(7) atom. In the ninth N site, N(7) is bonded to one Mg(1), one Si(3), one Si(4), and one Si(5) atom to form distorted corner-sharing NMgSi3 trigonal pyramids. In the tenth N site, N(8) is bonded in a trigonal planar geometry to one Si(3), one Si(5), and one Si(6) atom. is represented by the CIF file [CIF]
data_MgSi7N10
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.732
_cell_length_b   6.886
_cell_length_c   9.717
_cell_angle_alpha   90.000
_cell_angle_beta   105.150
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   434.773
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
  Mg  Mg0  1  0.995  0.931  0.696  1.0
  Mg  Mg1  1  0.995  0.069  0.196  1.0
  Si  Si2  1  0.541  0.979  0.823  1.0
  Si  Si3  1  0.541  0.021  0.323  1.0
  Si  Si4  1  0.349  0.022  0.018  1.0
  Si  Si5  1  0.349  0.978  0.518  1.0
  Si  Si6  1  0.110  0.398  0.072  1.0
  Si  Si7  1  0.110  0.602  0.572  1.0
  Si  Si8  1  0.662  0.361  0.992  1.0
  Si  Si9  1  0.662  0.639  0.492  1.0
  Si  Si10  1  0.843  0.618  0.809  1.0
  Si  Si11  1  0.843  0.382  0.309  1.0
  Si  Si12  1  0.298  0.619  0.882  1.0
  Si  Si13  1  0.298  0.381  0.382  1.0
  Si  Si14  1  0.484  0.368  0.686  1.0
  Si  Si15  1  0.484  0.632  0.186  1.0
  N  N16  1  0.749  0.848  0.812  1.0
  N  N17  1  0.749  0.152  0.312  1.0
  N  N18  1  0.558  0.133  0.971  1.0
  N  N19  1  0.558  0.867  0.471  1.0
  N  N20  1  0.310  0.871  0.862  1.0
  N  N21  1  0.310  0.129  0.362  1.0
  N  N22  1  0.151  0.159  0.039  1.0
  N  N23  1  0.151  0.841  0.539  1.0
  N  N24  1  0.289  0.507  0.722  1.0
  N  N25  1  0.289  0.493  0.222  1.0
  N  N26  1  0.443  0.121  0.670  1.0
  N  N27  1  0.443  0.879  0.170  1.0
  N  N28  1  0.885  0.379  0.133  1.0
  N  N29  1  0.885  0.621  0.633  1.0
  N  N30  1  0.076  0.570  0.935  1.0
  N  N31  1  0.076  0.430  0.435  1.0
  N  N32  1  0.700  0.414  0.825  1.0
  N  N33  1  0.700  0.586  0.325  1.0
  N  N34  1  0.499  0.541  0.022  1.0
  N  N35  1  0.499  0.459  0.522  1.0
[/CIF]
.