The material structure described by K2Na2MgSm2Nb2O10 crystallizes in the tetragonal P4mm space group. K(1) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(4), and four equivalent O(2) atoms. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a distorted single-bond geometry to one O(1) and four equivalent O(3) atoms. In the second Na site, Na(2) is bonded in a 4-coordinate geometry to four equivalent O(2) atoms. Mg(1) is bonded in a 4-coordinate geometry to four equivalent O(3) atoms. Sm(1) is bonded in a body-centered cubic geometry to four equivalent O(2) and four equivalent O(3) atoms. There are two inequivalent Nb sites. In the first Nb site, Nb(1) is bonded in a distorted trigonal bipyramidal geometry to one O(4) and four equivalent O(3) atoms. In the second Nb site, Nb(2) is bonded in a distorted square pyramidal geometry to one O(1) and four equivalent O(2) atoms. There are four inequivalent O sites. In the first O site, O(1) is bonded to four equivalent K(1), one Na(1), and one Nb(2) atom to form distorted corner-sharing OK4NaNb octahedra. The corner-sharing octahedral tilt angles are 6°. In the second O site, O(2) is bonded in a 4-coordinate geometry to two equivalent K(1), one Na(2), two equivalent Sm(1), and one Nb(2) atom. In the third O site, O(3) is bonded in a 5-coordinate geometry to one Na(1), one Mg(1), two equivalent Sm(1), and one Nb(1) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to four equivalent K(1) and one Nb(1) atom. is represented by the CIF file [CIF]
data_K2Na2Sm2MgNb2O10
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.648
_cell_length_b   5.648
_cell_length_c   9.390
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   299.484
_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
  K  K0  1  0.250  0.750  0.949  1.0
  K  K1  1  0.750  0.250  0.949  1.0
  Na  Na2  1  0.750  0.750  0.156  1.0
  Na  Na3  1  0.250  0.250  0.769  1.0
  Sm  Sm4  1  0.750  0.250  0.529  1.0
  Sm  Sm5  1  0.250  0.750  0.529  1.0
  Mg  Mg6  1  0.750  0.750  0.406  1.0
  Nb  Nb7  1  0.250  0.250  0.285  1.0
  Nb  Nb8  1  0.750  0.750  0.721  1.0
  O  O9  1  0.750  0.750  0.934  1.0
  O  O10  1  0.505  0.995  0.681  1.0
  O  O11  1  0.010  0.490  0.353  1.0
  O  O12  1  0.505  0.505  0.681  1.0
  O  O13  1  0.995  0.505  0.681  1.0
  O  O14  1  0.995  0.995  0.681  1.0
  O  O15  1  0.010  0.010  0.353  1.0
  O  O16  1  0.490  0.490  0.353  1.0
  O  O17  1  0.250  0.250  0.084  1.0
  O  O18  1  0.490  0.010  0.353  1.0
[/CIF]
.
The material structure described by K2Na2MgSm2Nb2O10 crystallizes in the tetragonal P4mm space group. K(1) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(4), and four equivalent O(2) atoms. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a distorted single-bond geometry to one O(1) and four equivalent O(3) atoms. In the second Na site, Na(2) is bonded in a 4-coordinate geometry to four equivalent O(2) atoms. Mg(1) is bonded in a 4-coordinate geometry to four equivalent O(3) atoms. Sm(1) is bonded in a body-centered cubic geometry to four equivalent O(2) and four equivalent O(3) atoms. There are two inequivalent Nb sites. In the first Nb site, Nb(1) is bonded in a distorted trigonal bipyramidal geometry to one O(4) and four equivalent O(3) atoms. In the second Nb site, Nb(2) is bonded in a distorted square pyramidal geometry to one O(1) and four equivalent O(2) atoms. There are four inequivalent O sites. In the first O site, O(1) is bonded to four equivalent K(1), one Na(1), and one Nb(2) atom to form distorted corner-sharing OK4NaNb octahedra. The corner-sharing octahedral tilt angles are 6°. In the second O site, O(2) is bonded in a 4-coordinate geometry to two equivalent K(1), one Na(2), two equivalent Sm(1), and one Nb(2) atom. In the third O site, O(3) is bonded in a 5-coordinate geometry to one Na(1), one Mg(1), two equivalent Sm(1), and one Nb(1) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to four equivalent K(1) and one Nb(1) atom. is represented by the CIF file [CIF]
data_K2Na2Sm2MgNb2O10
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.648
_cell_length_b   5.648
_cell_length_c   9.390
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   299.484
_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
  K  K0  1  0.250  0.750  0.949  1.0
  K  K1  1  0.750  0.250  0.949  1.0
  Na  Na2  1  0.750  0.750  0.156  1.0
  Na  Na3  1  0.250  0.250  0.769  1.0
  Sm  Sm4  1  0.750  0.250  0.529  1.0
  Sm  Sm5  1  0.250  0.750  0.529  1.0
  Mg  Mg6  1  0.750  0.750  0.406  1.0
  Nb  Nb7  1  0.250  0.250  0.285  1.0
  Nb  Nb8  1  0.750  0.750  0.721  1.0
  O  O9  1  0.750  0.750  0.934  1.0
  O  O10  1  0.505  0.995  0.681  1.0
  O  O11  1  0.010  0.490  0.353  1.0
  O  O12  1  0.505  0.505  0.681  1.0
  O  O13  1  0.995  0.505  0.681  1.0
  O  O14  1  0.995  0.995  0.681  1.0
  O  O15  1  0.010  0.010  0.353  1.0
  O  O16  1  0.490  0.490  0.353  1.0
  O  O17  1  0.250  0.250  0.084  1.0
  O  O18  1  0.490  0.010  0.353  1.0
[/CIF]
.