The structure described by Sr4MgSm2Ta2O12 is Pb (Zr_0.50 Ti_0.48) O_3-derived structured and crystallizes in the triclinic P1 space group. There are four inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 7-coordinate geometry to one O(1), one O(11), one O(3), one O(5), one O(6), one O(7), and one O(9) atom. In the second Sr site, Sr(2) is bonded in a 8-coordinate geometry to one O(10), one O(11), one O(12), one O(2), one O(4), one O(5), one O(6), and one O(8) atom. In the third Sr site, Sr(3) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(11), one O(3), one O(5), one O(7), one O(8), and one O(9) atom. In the fourth Sr site, Sr(4) is bonded in a 4-coordinate geometry to one O(10), one O(11), one O(2), one O(4), one O(5), one O(7), and one O(8) atom. Mg(1) is bonded in a distorted see-saw-like geometry to one O(10), one O(12), one O(2), and one O(6) atom. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded to one O(1), one O(11), one O(12), one O(2), one O(7), and one O(8) atom to form distorted SmO6 octahedra that share corners with four equivalent Ta(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 9-45°. In the second Sm site, Sm(2) is bonded to one O(3), one O(4), one O(5), one O(6), and one O(9) atom to form SmO5 trigonal bipyramids that share corners with two equivalent Ta(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 28-36°. There are two inequivalent Ta sites. In the first Ta site, Ta(1) is bonded in a 4-coordinate geometry to one O(1), one O(10), one O(5), and one O(9) atom. In the second Ta site, Ta(2) is bonded to one O(11), one O(12), one O(3), one O(4), one O(7), and one O(8) atom to form distorted TaO6 octahedra that share corners with four equivalent Sm(1)O6 octahedra and corners with two equivalent Sm(2)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 9-45°. There are twelve inequivalent O sites. In the first O site, O(1) is bonded to one Sr(1), one Sr(3), one Sm(1), and one Ta(1) atom to form distorted OSr2SmTa tetrahedra that share corners with two equivalent O(3)Sr2SmTa tetrahedra and  an edgeedge with one O(8)Sr3SmTa square pyramid. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to one Sr(2), one Sr(4), one Mg(1), and one Sm(1) atom. In the third O site, O(3) is bonded to one Sr(1), one Sr(3), one Sm(2), and one Ta(2) atom to form distorted OSr2SmTa tetrahedra that share corners with two equivalent O(1)Sr2SmTa tetrahedra, corners with two equivalent O(4)Sr2SmTa trigonal pyramids, and  an edgeedge with one O(8)Sr3SmTa square pyramid. In the fourth O site, O(4) is bonded to one Sr(2), one Sr(4), one Sm(2), and one Ta(2) atom to form distorted OSr2SmTa trigonal pyramids that share  a cornercorner with one O(8)Sr3SmTa square pyramid, corners with two equivalent O(3)Sr2SmTa tetrahedra, and  an edgeedge with one O(8)Sr3SmTa square pyramid. In the fifth O site, O(5) is bonded in a 6-coordinate geometry to one Sr(1), one Sr(2), one Sr(3), one Sr(4), one Sm(2), and one Ta(1) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), one Mg(1), and one Sm(2) atom. In the seventh O site, O(7) is bonded in a 5-coordinate geometry to one Sr(1), one Sr(3), one Sr(4), one Sm(1), and one Ta(2) atom. In the eighth O site, O(8) is bonded to one Sr(2), one Sr(3), one Sr(4), one Sm(1), and one Ta(2) atom to form a mixture of distorted corner and edge-sharing OSr3SmTa square pyramids. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(3), one Sm(2), and one Ta(1) atom. In the tenth O site, O(10) is bonded in a 5-coordinate geometry to one Sr(2), one Sr(3), one Sr(4), one Mg(1), and one Ta(1) atom. In the eleventh O site, O(11) is bonded in a 6-coordinate geometry to one Sr(1), one Sr(2), one Sr(3), one Sr(4), one Sm(1), and one Ta(2) atom. In the twelfth O site, O(12) is bonded in a 2-coordinate geometry to one Sr(2), one Mg(1), one Sm(1), and one Ta(2) atom. is represented by the CIF card [CIF]
data_Sr4Sm2MgTa2O12
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.090
_cell_length_b   6.326
_cell_length_c   8.410
_cell_angle_alpha   89.437
_cell_angle_beta   90.666
_cell_angle_gamma   88.899
_symmetry_Int_Tables_number   1
_cell_volume   323.894
_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  0.000  0.474  0.234  1.0
  Sr  Sr1  1  0.996  0.609  0.739  1.0
  Sr  Sr2  1  0.500  0.906  0.258  1.0
  Sr  Sr3  1  0.457  0.902  0.718  1.0
  Sm  Sm4  1  0.995  0.983  0.462  1.0
  Sm  Sm5  1  0.479  0.439  0.006  1.0
  Mg  Mg6  1  0.855  0.170  0.793  1.0
  Ta  Ta7  1  0.016  0.969  0.064  1.0
  Ta  Ta8  1  0.495  0.459  0.498  1.0
  O  O9  1  0.846  0.115  0.228  1.0
  O  O10  1  0.086  0.984  0.725  1.0
  O  O11  1  0.576  0.509  0.270  1.0
  O  O12  1  0.416  0.498  0.732  1.0
  O  O13  1  0.222  0.720  0.024  1.0
  O  O14  1  0.829  0.398  0.943  1.0
  O  O15  1  0.317  0.219  0.452  1.0
  O  O16  1  0.718  0.746  0.524  1.0
  O  O17  1  0.258  0.165  0.084  1.0
  O  O18  1  0.749  0.914  0.938  1.0
  O  O19  1  0.255  0.687  0.465  1.0
  O  O20  1  0.758  0.280  0.577  1.0
[/CIF]
.
The structure described by Sr4MgSm2Ta2O12 is Pb (Zr_0.50 Ti_0.48) O_3-derived structured and crystallizes in the triclinic P1 space group. There are four inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 7-coordinate geometry to one O(1), one O(11), one O(3), one O(5), one O(6), one O(7), and one O(9) atom. In the second Sr site, Sr(2) is bonded in a 8-coordinate geometry to one O(10), one O(11), one O(12), one O(2), one O(4), one O(5), one O(6), and one O(8) atom. In the third Sr site, Sr(3) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(11), one O(3), one O(5), one O(7), one O(8), and one O(9) atom. In the fourth Sr site, Sr(4) is bonded in a 4-coordinate geometry to one O(10), one O(11), one O(2), one O(4), one O(5), one O(7), and one O(8) atom. Mg(1) is bonded in a distorted see-saw-like geometry to one O(10), one O(12), one O(2), and one O(6) atom. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded to one O(1), one O(11), one O(12), one O(2), one O(7), and one O(8) atom to form distorted SmO6 octahedra that share corners with four equivalent Ta(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 9-45°. In the second Sm site, Sm(2) is bonded to one O(3), one O(4), one O(5), one O(6), and one O(9) atom to form SmO5 trigonal bipyramids that share corners with two equivalent Ta(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 28-36°. There are two inequivalent Ta sites. In the first Ta site, Ta(1) is bonded in a 4-coordinate geometry to one O(1), one O(10), one O(5), and one O(9) atom. In the second Ta site, Ta(2) is bonded to one O(11), one O(12), one O(3), one O(4), one O(7), and one O(8) atom to form distorted TaO6 octahedra that share corners with four equivalent Sm(1)O6 octahedra and corners with two equivalent Sm(2)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 9-45°. There are twelve inequivalent O sites. In the first O site, O(1) is bonded to one Sr(1), one Sr(3), one Sm(1), and one Ta(1) atom to form distorted OSr2SmTa tetrahedra that share corners with two equivalent O(3)Sr2SmTa tetrahedra and  an edgeedge with one O(8)Sr3SmTa square pyramid. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to one Sr(2), one Sr(4), one Mg(1), and one Sm(1) atom. In the third O site, O(3) is bonded to one Sr(1), one Sr(3), one Sm(2), and one Ta(2) atom to form distorted OSr2SmTa tetrahedra that share corners with two equivalent O(1)Sr2SmTa tetrahedra, corners with two equivalent O(4)Sr2SmTa trigonal pyramids, and  an edgeedge with one O(8)Sr3SmTa square pyramid. In the fourth O site, O(4) is bonded to one Sr(2), one Sr(4), one Sm(2), and one Ta(2) atom to form distorted OSr2SmTa trigonal pyramids that share  a cornercorner with one O(8)Sr3SmTa square pyramid, corners with two equivalent O(3)Sr2SmTa tetrahedra, and  an edgeedge with one O(8)Sr3SmTa square pyramid. In the fifth O site, O(5) is bonded in a 6-coordinate geometry to one Sr(1), one Sr(2), one Sr(3), one Sr(4), one Sm(2), and one Ta(1) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), one Mg(1), and one Sm(2) atom. In the seventh O site, O(7) is bonded in a 5-coordinate geometry to one Sr(1), one Sr(3), one Sr(4), one Sm(1), and one Ta(2) atom. In the eighth O site, O(8) is bonded to one Sr(2), one Sr(3), one Sr(4), one Sm(1), and one Ta(2) atom to form a mixture of distorted corner and edge-sharing OSr3SmTa square pyramids. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(3), one Sm(2), and one Ta(1) atom. In the tenth O site, O(10) is bonded in a 5-coordinate geometry to one Sr(2), one Sr(3), one Sr(4), one Mg(1), and one Ta(1) atom. In the eleventh O site, O(11) is bonded in a 6-coordinate geometry to one Sr(1), one Sr(2), one Sr(3), one Sr(4), one Sm(1), and one Ta(2) atom. In the twelfth O site, O(12) is bonded in a 2-coordinate geometry to one Sr(2), one Mg(1), one Sm(1), and one Ta(2) atom. is represented by the CIF card [CIF]
data_Sr4Sm2MgTa2O12
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.090
_cell_length_b   6.326
_cell_length_c   8.410
_cell_angle_alpha   89.437
_cell_angle_beta   90.666
_cell_angle_gamma   88.899
_symmetry_Int_Tables_number   1
_cell_volume   323.894
_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  0.000  0.474  0.234  1.0
  Sr  Sr1  1  0.996  0.609  0.739  1.0
  Sr  Sr2  1  0.500  0.906  0.258  1.0
  Sr  Sr3  1  0.457  0.902  0.718  1.0
  Sm  Sm4  1  0.995  0.983  0.462  1.0
  Sm  Sm5  1  0.479  0.439  0.006  1.0
  Mg  Mg6  1  0.855  0.170  0.793  1.0
  Ta  Ta7  1  0.016  0.969  0.064  1.0
  Ta  Ta8  1  0.495  0.459  0.498  1.0
  O  O9  1  0.846  0.115  0.228  1.0
  O  O10  1  0.086  0.984  0.725  1.0
  O  O11  1  0.576  0.509  0.270  1.0
  O  O12  1  0.416  0.498  0.732  1.0
  O  O13  1  0.222  0.720  0.024  1.0
  O  O14  1  0.829  0.398  0.943  1.0
  O  O15  1  0.317  0.219  0.452  1.0
  O  O16  1  0.718  0.746  0.524  1.0
  O  O17  1  0.258  0.165  0.084  1.0
  O  O18  1  0.749  0.914  0.938  1.0
  O  O19  1  0.255  0.687  0.465  1.0
  O  O20  1  0.758  0.280  0.577  1.0
[/CIF]
.