The compound described by Sr2MgV2(Si2O7)2 crystallizes in the triclinic P1 space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 9-coordinate geometry to one O(10), one O(11), one O(13), one O(14), one O(5), one O(6), one O(7), and two equivalent O(1) atoms. In the second Sr site, Sr(2) is bonded in a 8-coordinate geometry to one O(12), one O(13), one O(5), one O(6), one O(8), one O(9), and two equivalent O(2) atoms. Mg(1) is bonded to one O(11), one O(12), one O(6), one O(7), and one O(8) atom to form distorted MgO5 trigonal bipyramids that share  a cornercorner with one Si(2)O4 tetrahedra, corners with two equivalent Si(4)O4 tetrahedra,  a cornercorner with one V(2)O5 trigonal bipyramid,  a cornercorner with one V(1)O4 trigonal pyramid,  an edgeedge with one Si(3)O4 tetrahedra, and  an edgeedge with one V(2)O5 trigonal bipyramid. There are two inequivalent V sites. In the first V site, V(1) is bonded to one O(10), one O(13), one O(5), and one O(8) atom to form distorted VO4 trigonal pyramids that share  a cornercorner with one Si(4)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, and  a cornercorner with one Mg(1)O5 trigonal bipyramid. In the second V site, V(2) is bonded to one O(11), one O(14), one O(6), one O(7), and one O(9) atom to form distorted VO5 trigonal bipyramids that share corners with two equivalent Si(2)O4 tetrahedra, corners with two equivalent Si(3)O4 tetrahedra,  a cornercorner with one Mg(1)O5 trigonal bipyramid, and  an edgeedge with one Mg(1)O5 trigonal bipyramid. There are four inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(13), one O(2), one O(3), and one O(5) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, and corners with two equivalent V(1)O4 trigonal pyramids. In the second Si site, Si(2) is bonded to one O(1), one O(14), one O(3), and one O(6) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Mg(1)O5 trigonal bipyramid, and corners with two equivalent V(2)O5 trigonal bipyramids. In the third Si site, Si(3) is bonded to one O(1), one O(11), one O(4), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, corners with two equivalent V(2)O5 trigonal bipyramids, and  an edgeedge with one Mg(1)O5 trigonal bipyramid. In the fourth Si site, Si(4) is bonded to one O(12), 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(3)O4 tetrahedra, corners with two equivalent Mg(1)O5 trigonal bipyramids, and  a cornercorner with one V(1)O4 trigonal pyramid. There are fourteen 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(2), and one Si(3) atom. In the second O site, O(2) is bonded in a distorted linear geometry to two equivalent Sr(2), one Si(1), and one Si(4) atom. In the third O site, O(3) is bonded in a linear geometry to one Si(1) and one Si(2) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one Si(3) and one Si(4) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), one V(1), and one Si(1) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Sr(1), one Sr(2), one Mg(1), one V(2), and one Si(2) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Sr(1), one Mg(1), one V(2), and one Si(3) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Sr(2), one Mg(1), one V(1), and one Si(4) atom. In the ninth O site, O(9) is bonded in a linear geometry to one Sr(2) and one V(2) atom. In the tenth O site, O(10) is bonded in a linear geometry to one Sr(1) and one V(1) atom. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to one Sr(1), one Mg(1), one V(2), and one Si(3) atom. In the twelfth O site, O(12) is bonded in a 3-coordinate geometry to one Sr(2), one Mg(1), and one Si(4) atom. In the thirteenth O site, O(13) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), one V(1), and one Si(1) atom. In the fourteenth O site, O(14) is bonded in a 3-coordinate geometry to one Sr(1), one V(2), and one Si(2) atom. is represented by the CIF card [CIF]
data_Sr2MgV2(Si2O7)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.524
_cell_length_b   7.422
_cell_length_c   8.133
_cell_angle_alpha   75.916
_cell_angle_beta   110.255
_cell_angle_gamma   93.152
_symmetry_Int_Tables_number   1
_cell_volume   303.241
_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  0.192  0.687  0.365  1.0
  Sr  Sr1  1  0.849  0.329  0.701  1.0
  Mg  Mg2  1  0.729  0.072  0.452  1.0
  V  V3  1  0.950  0.752  0.817  1.0
  V  V4  1  0.116  0.199  0.240  1.0
  Si  Si5  1  0.415  0.504  0.803  1.0
  Si  Si6  1  0.594  0.465  0.231  1.0
  Si  Si7  1  0.607  0.908  0.174  1.0
  Si  Si8  1  0.366  0.071  0.748  1.0
  O  O9  1  0.648  0.679  0.263  1.0
  O  O10  1  0.362  0.296  0.752  1.0
  O  O11  1  0.506  0.476  0.018  1.0
  O  O12  1  0.512  0.953  0.956  1.0
  O  O13  1  0.618  0.609  0.709  1.0
  O  O14  1  0.856  0.333  0.349  1.0
  O  O15  1  0.421  0.990  0.261  1.0
  O  O16  1  0.061  0.010  0.683  1.0
  O  O17  1  0.979  0.280  0.003  1.0
  O  O18  1  0.034  0.738  0.044  1.0
  O  O19  1  0.894  0.976  0.288  1.0
  O  O20  1  0.528  0.055  0.621  1.0
  O  O21  1  0.132  0.610  0.701  1.0
  O  O22  1  0.380  0.387  0.325  1.0
[/CIF]
.
The compound described by Sr2MgV2(Si2O7)2 crystallizes in the triclinic P1 space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 9-coordinate geometry to one O(10), one O(11), one O(13), one O(14), one O(5), one O(6), one O(7), and two equivalent O(1) atoms. In the second Sr site, Sr(2) is bonded in a 8-coordinate geometry to one O(12), one O(13), one O(5), one O(6), one O(8), one O(9), and two equivalent O(2) atoms. Mg(1) is bonded to one O(11), one O(12), one O(6), one O(7), and one O(8) atom to form distorted MgO5 trigonal bipyramids that share  a cornercorner with one Si(2)O4 tetrahedra, corners with two equivalent Si(4)O4 tetrahedra,  a cornercorner with one V(2)O5 trigonal bipyramid,  a cornercorner with one V(1)O4 trigonal pyramid,  an edgeedge with one Si(3)O4 tetrahedra, and  an edgeedge with one V(2)O5 trigonal bipyramid. There are two inequivalent V sites. In the first V site, V(1) is bonded to one O(10), one O(13), one O(5), and one O(8) atom to form distorted VO4 trigonal pyramids that share  a cornercorner with one Si(4)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, and  a cornercorner with one Mg(1)O5 trigonal bipyramid. In the second V site, V(2) is bonded to one O(11), one O(14), one O(6), one O(7), and one O(9) atom to form distorted VO5 trigonal bipyramids that share corners with two equivalent Si(2)O4 tetrahedra, corners with two equivalent Si(3)O4 tetrahedra,  a cornercorner with one Mg(1)O5 trigonal bipyramid, and  an edgeedge with one Mg(1)O5 trigonal bipyramid. There are four inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(13), one O(2), one O(3), and one O(5) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, and corners with two equivalent V(1)O4 trigonal pyramids. In the second Si site, Si(2) is bonded to one O(1), one O(14), one O(3), and one O(6) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Mg(1)O5 trigonal bipyramid, and corners with two equivalent V(2)O5 trigonal bipyramids. In the third Si site, Si(3) is bonded to one O(1), one O(11), one O(4), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, corners with two equivalent V(2)O5 trigonal bipyramids, and  an edgeedge with one Mg(1)O5 trigonal bipyramid. In the fourth Si site, Si(4) is bonded to one O(12), 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(3)O4 tetrahedra, corners with two equivalent Mg(1)O5 trigonal bipyramids, and  a cornercorner with one V(1)O4 trigonal pyramid. There are fourteen 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(2), and one Si(3) atom. In the second O site, O(2) is bonded in a distorted linear geometry to two equivalent Sr(2), one Si(1), and one Si(4) atom. In the third O site, O(3) is bonded in a linear geometry to one Si(1) and one Si(2) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one Si(3) and one Si(4) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), one V(1), and one Si(1) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Sr(1), one Sr(2), one Mg(1), one V(2), and one Si(2) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Sr(1), one Mg(1), one V(2), and one Si(3) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Sr(2), one Mg(1), one V(1), and one Si(4) atom. In the ninth O site, O(9) is bonded in a linear geometry to one Sr(2) and one V(2) atom. In the tenth O site, O(10) is bonded in a linear geometry to one Sr(1) and one V(1) atom. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to one Sr(1), one Mg(1), one V(2), and one Si(3) atom. In the twelfth O site, O(12) is bonded in a 3-coordinate geometry to one Sr(2), one Mg(1), and one Si(4) atom. In the thirteenth O site, O(13) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), one V(1), and one Si(1) atom. In the fourteenth O site, O(14) is bonded in a 3-coordinate geometry to one Sr(1), one V(2), and one Si(2) atom. is represented by the CIF card [CIF]
data_Sr2MgV2(Si2O7)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.524
_cell_length_b   7.422
_cell_length_c   8.133
_cell_angle_alpha   75.916
_cell_angle_beta   110.255
_cell_angle_gamma   93.152
_symmetry_Int_Tables_number   1
_cell_volume   303.241
_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  0.192  0.687  0.365  1.0
  Sr  Sr1  1  0.849  0.329  0.701  1.0
  Mg  Mg2  1  0.729  0.072  0.452  1.0
  V  V3  1  0.950  0.752  0.817  1.0
  V  V4  1  0.116  0.199  0.240  1.0
  Si  Si5  1  0.415  0.504  0.803  1.0
  Si  Si6  1  0.594  0.465  0.231  1.0
  Si  Si7  1  0.607  0.908  0.174  1.0
  Si  Si8  1  0.366  0.071  0.748  1.0
  O  O9  1  0.648  0.679  0.263  1.0
  O  O10  1  0.362  0.296  0.752  1.0
  O  O11  1  0.506  0.476  0.018  1.0
  O  O12  1  0.512  0.953  0.956  1.0
  O  O13  1  0.618  0.609  0.709  1.0
  O  O14  1  0.856  0.333  0.349  1.0
  O  O15  1  0.421  0.990  0.261  1.0
  O  O16  1  0.061  0.010  0.683  1.0
  O  O17  1  0.979  0.280  0.003  1.0
  O  O18  1  0.034  0.738  0.044  1.0
  O  O19  1  0.894  0.976  0.288  1.0
  O  O20  1  0.528  0.055  0.621  1.0
  O  O21  1  0.132  0.610  0.701  1.0
  O  O22  1  0.380  0.387  0.325  1.0
[/CIF]
.