The crystal structure described by K2Na2MgNd2Nb2O10 crystallizes in the orthorhombic Pmm2 space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a distorted square co-planar geometry to two equivalent O(2) and two equivalent O(4) atoms. In the second K site, K(2) is bonded in a 9-coordinate geometry to one Mg(1), two equivalent O(2), two equivalent O(4), and four equivalent O(3) atoms. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 5-coordinate geometry to one O(4) and four equivalent O(1) atoms. In the second Na site, Na(2) is bonded in a 5-coordinate geometry to one O(2) and four equivalent O(3) atoms. Mg(1) is bonded in a 4-coordinate geometry to one K(2) and four equivalent O(1) atoms. There are two inequivalent Nd sites. In the first Nd site, Nd(1) is bonded in a body-centered cubic geometry to four equivalent O(1) and four equivalent O(3) atoms. In the second Nd site, Nd(2) is bonded in a 8-coordinate geometry to four equivalent O(1) 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 5-coordinate geometry to one O(2) and four equivalent O(1) atoms. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to one Na(1), one Mg(1), one Nd(1), one Nd(2), and one Nb(2) atom. In the second O site, O(2) is bonded in a 6-coordinate geometry to two equivalent K(1), two equivalent K(2), one Na(2), and one Nb(2) atom. In the third O site, O(3) is bonded in a 5-coordinate geometry to one K(2), one Na(2), one Nd(1), one Nd(2), and one Nb(1) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to two equivalent K(1), two equivalent K(2), one Na(1), and one Nb(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_K2Na2Nd2MgNb2O10
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.798
_cell_length_b   5.717
_cell_length_c   9.351
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   309.915
_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  0.005  1.0
  K  K1  1  0.750  0.250  0.081  1.0
  Na  Na2  1  0.250  0.250  0.756  1.0
  Na  Na3  1  0.750  0.750  0.241  1.0
  Nd  Nd4  1  0.250  0.750  0.516  1.0
  Nd  Nd5  1  0.750  0.250  0.457  1.0
  Mg  Mg6  1  0.750  0.250  0.749  1.0
  Nb  Nb7  1  0.250  0.250  0.268  1.0
  Nb  Nb8  1  0.750  0.750  0.743  1.0
  O  O9  1  0.975  0.995  0.654  1.0
  O  O10  1  0.525  0.505  0.654  1.0
  O  O11  1  0.750  0.750  0.946  1.0
  O  O12  1  0.482  0.015  0.332  1.0
  O  O13  1  0.482  0.485  0.332  1.0
  O  O14  1  0.250  0.250  0.069  1.0
  O  O15  1  0.525  0.995  0.654  1.0
  O  O16  1  0.975  0.505  0.654  1.0
  O  O17  1  0.018  0.015  0.332  1.0
  O  O18  1  0.018  0.485  0.332  1.0
[/CIF]
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The crystal structure described by K2Na2MgNd2Nb2O10 crystallizes in the orthorhombic Pmm2 space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a distorted square co-planar geometry to two equivalent O(2) and two equivalent O(4) atoms. In the second K site, K(2) is bonded in a 9-coordinate geometry to one Mg(1), two equivalent O(2), two equivalent O(4), and four equivalent O(3) atoms. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 5-coordinate geometry to one O(4) and four equivalent O(1) atoms. In the second Na site, Na(2) is bonded in a 5-coordinate geometry to one O(2) and four equivalent O(3) atoms. Mg(1) is bonded in a 4-coordinate geometry to one K(2) and four equivalent O(1) atoms. There are two inequivalent Nd sites. In the first Nd site, Nd(1) is bonded in a body-centered cubic geometry to four equivalent O(1) and four equivalent O(3) atoms. In the second Nd site, Nd(2) is bonded in a 8-coordinate geometry to four equivalent O(1) 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 5-coordinate geometry to one O(2) and four equivalent O(1) atoms. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to one Na(1), one Mg(1), one Nd(1), one Nd(2), and one Nb(2) atom. In the second O site, O(2) is bonded in a 6-coordinate geometry to two equivalent K(1), two equivalent K(2), one Na(2), and one Nb(2) atom. In the third O site, O(3) is bonded in a 5-coordinate geometry to one K(2), one Na(2), one Nd(1), one Nd(2), and one Nb(1) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to two equivalent K(1), two equivalent K(2), one Na(1), and one Nb(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_K2Na2Nd2MgNb2O10
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.798
_cell_length_b   5.717
_cell_length_c   9.351
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   309.915
_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  0.005  1.0
  K  K1  1  0.750  0.250  0.081  1.0
  Na  Na2  1  0.250  0.250  0.756  1.0
  Na  Na3  1  0.750  0.750  0.241  1.0
  Nd  Nd4  1  0.250  0.750  0.516  1.0
  Nd  Nd5  1  0.750  0.250  0.457  1.0
  Mg  Mg6  1  0.750  0.250  0.749  1.0
  Nb  Nb7  1  0.250  0.250  0.268  1.0
  Nb  Nb8  1  0.750  0.750  0.743  1.0
  O  O9  1  0.975  0.995  0.654  1.0
  O  O10  1  0.525  0.505  0.654  1.0
  O  O11  1  0.750  0.750  0.946  1.0
  O  O12  1  0.482  0.015  0.332  1.0
  O  O13  1  0.482  0.485  0.332  1.0
  O  O14  1  0.250  0.250  0.069  1.0
  O  O15  1  0.525  0.995  0.654  1.0
  O  O16  1  0.975  0.505  0.654  1.0
  O  O17  1  0.018  0.015  0.332  1.0
  O  O18  1  0.018  0.485  0.332  1.0
[/CIF]
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