The material described by Sr2MgV2(Si2O7)2 crystallizes in the monoclinic C2 space group. Sr(1) is bonded in a 10-coordinate geometry to one O(6), one O(8), two equivalent O(1), two equivalent O(4), two equivalent O(5), and two equivalent O(7) atoms. Mg(1) is bonded in a 5-coordinate geometry to one O(2), two equivalent O(6), and two equivalent O(8) atoms. V(1) is bonded to one O(4), one O(5), one O(6), one O(7), and one O(8) atom to form distorted VO5 trigonal bipyramids that share corners with two equivalent Si(1)O4 tetrahedra and corners with two equivalent Si(2)O4 tetrahedra. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(2), one O(4), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra, and corners with two equivalent V(1)O5 trigonal bipyramids. In the second Si site, Si(2) is bonded to one O(1), one O(3), one O(5), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra, and corners with two equivalent V(1)O5 trigonal bipyramids. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to two equivalent Sr(1), one Si(1), and one Si(2) atom. In the second O site, O(2) is bonded in a T-shaped geometry to one Mg(1) and two equivalent Si(1) atoms. In the third O site, O(3) is bonded in a linear geometry to two equivalent Si(2) atoms. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to two equivalent Sr(1), one V(1), and one Si(1) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to two equivalent Sr(1), one V(1), and one Si(2) atom. In the sixth O site, O(6) is bonded in a distorted T-shaped geometry to one Sr(1), one Mg(1), and one V(1) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to two equivalent Sr(1), one V(1), and one Si(2) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Sr(1), one Mg(1), one V(1), and one Si(1) atom. is represented by the CIF card [CIF]
data_Sr2MgV2(Si2O7)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.544
_cell_length_b   7.288
_cell_length_c   7.885
_cell_angle_alpha   93.106
_cell_angle_beta   110.583
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   297.724
_cell_formula_units_Z   1
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
  Sr  Sr0  1  0.197  0.770  0.388  1.0
  Sr  Sr1  1  0.809  0.230  0.612  1.0
  Mg  Mg2  1  0.127  0.500  0.000  1.0
  V  V3  1  0.873  0.765  0.771  1.0
  V  V4  1  0.102  0.235  0.229  1.0
  Si  Si5  1  0.406  0.470  0.778  1.0
  Si  Si6  1  0.628  0.530  0.222  1.0
  Si  Si7  1  0.606  0.976  0.217  1.0
  Si  Si8  1  0.389  0.024  0.783  1.0
  O  O9  1  0.644  0.756  0.274  1.0
  O  O10  1  0.370  0.244  0.726  1.0
  O  O11  1  0.529  0.500  0.000  1.0
  O  O12  1  0.501  0.000  0.000  1.0
  O  O13  1  0.588  0.556  0.680  1.0
  O  O14  1  0.908  0.444  0.320  1.0
  O  O15  1  0.406  0.062  0.309  1.0
  O  O16  1  0.097  0.938  0.691  1.0
  O  O17  1  0.985  0.256  0.981  1.0
  O  O18  1  0.004  0.744  0.019  1.0
  O  O19  1  0.895  0.060  0.317  1.0
  O  O20  1  0.579  0.940  0.683  1.0
  O  O21  1  0.112  0.540  0.734  1.0
  O  O22  1  0.378  0.460  0.266  1.0
[/CIF]
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The material described by Sr2MgV2(Si2O7)2 crystallizes in the monoclinic C2 space group. Sr(1) is bonded in a 10-coordinate geometry to one O(6), one O(8), two equivalent O(1), two equivalent O(4), two equivalent O(5), and two equivalent O(7) atoms. Mg(1) is bonded in a 5-coordinate geometry to one O(2), two equivalent O(6), and two equivalent O(8) atoms. V(1) is bonded to one O(4), one O(5), one O(6), one O(7), and one O(8) atom to form distorted VO5 trigonal bipyramids that share corners with two equivalent Si(1)O4 tetrahedra and corners with two equivalent Si(2)O4 tetrahedra. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(2), one O(4), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra, and corners with two equivalent V(1)O5 trigonal bipyramids. In the second Si site, Si(2) is bonded to one O(1), one O(3), one O(5), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra, and corners with two equivalent V(1)O5 trigonal bipyramids. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to two equivalent Sr(1), one Si(1), and one Si(2) atom. In the second O site, O(2) is bonded in a T-shaped geometry to one Mg(1) and two equivalent Si(1) atoms. In the third O site, O(3) is bonded in a linear geometry to two equivalent Si(2) atoms. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to two equivalent Sr(1), one V(1), and one Si(1) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to two equivalent Sr(1), one V(1), and one Si(2) atom. In the sixth O site, O(6) is bonded in a distorted T-shaped geometry to one Sr(1), one Mg(1), and one V(1) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to two equivalent Sr(1), one V(1), and one Si(2) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Sr(1), one Mg(1), one V(1), and one Si(1) atom. is represented by the CIF card [CIF]
data_Sr2MgV2(Si2O7)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.544
_cell_length_b   7.288
_cell_length_c   7.885
_cell_angle_alpha   93.106
_cell_angle_beta   110.583
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   297.724
_cell_formula_units_Z   1
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
  Sr  Sr0  1  0.197  0.770  0.388  1.0
  Sr  Sr1  1  0.809  0.230  0.612  1.0
  Mg  Mg2  1  0.127  0.500  0.000  1.0
  V  V3  1  0.873  0.765  0.771  1.0
  V  V4  1  0.102  0.235  0.229  1.0
  Si  Si5  1  0.406  0.470  0.778  1.0
  Si  Si6  1  0.628  0.530  0.222  1.0
  Si  Si7  1  0.606  0.976  0.217  1.0
  Si  Si8  1  0.389  0.024  0.783  1.0
  O  O9  1  0.644  0.756  0.274  1.0
  O  O10  1  0.370  0.244  0.726  1.0
  O  O11  1  0.529  0.500  0.000  1.0
  O  O12  1  0.501  0.000  0.000  1.0
  O  O13  1  0.588  0.556  0.680  1.0
  O  O14  1  0.908  0.444  0.320  1.0
  O  O15  1  0.406  0.062  0.309  1.0
  O  O16  1  0.097  0.938  0.691  1.0
  O  O17  1  0.985  0.256  0.981  1.0
  O  O18  1  0.004  0.744  0.019  1.0
  O  O19  1  0.895  0.060  0.317  1.0
  O  O20  1  0.579  0.940  0.683  1.0
  O  O21  1  0.112  0.540  0.734  1.0
  O  O22  1  0.378  0.460  0.266  1.0
[/CIF]
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