The structure described by K4Eu(PSe4)2 crystallizes in the orthorhombic Ibam space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 8-coordinate geometry to one Se(2), one Se(3), and six equivalent Se(1) atoms. In the second K site, K(2) is bonded in a 6-coordinate geometry to two equivalent Se(2) and four equivalent Se(3) atoms. Eu(1) is bonded to four equivalent Se(1) and four equivalent Se(2) atoms to form distorted EuSe8 hexagonal bipyramids that share edges with two equivalent Eu(1)Se8 hexagonal bipyramids and edges with four equivalent P(1)Se4 tetrahedra. P(1) is bonded to one Se(2), one Se(3), and two equivalent Se(1) atoms to form PSe4 tetrahedra that share edges with two equivalent Eu(1)Se8 hexagonal bipyramids. There are three inequivalent Se sites. In the first Se site, Se(2) is bonded in a 6-coordinate geometry to one K(1), two equivalent K(2), two equivalent Eu(1), and one P(1) atom. In the second Se site, Se(3) is bonded to one K(1), four equivalent K(2), and one P(1) atom to form a mixture of distorted corner and edge-sharing SeK5P octahedra. The corner-sharing octahedral tilt angles range from 1-11°. In the third Se site, Se(1) is bonded in a 5-coordinate geometry to three equivalent K(1), one Eu(1), and one P(1) atom. is represented by the CIF file [CIF]
data_K4Eu(PSe4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   11.865
_cell_length_b   11.865
_cell_length_c   11.865
_cell_angle_alpha   134.101
_cell_angle_beta   128.292
_cell_angle_gamma   71.603
_symmetry_Int_Tables_number   1
_cell_volume   921.294
_cell_formula_units_Z   2
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  0.416  0.299  0.883  1.0
  K  K1  1  0.584  0.701  0.117  1.0
  K  K2  1  0.084  0.468  0.383  1.0
  K  K3  1  0.916  0.532  0.617  1.0
  K  K4  1  0.010  0.760  0.250  1.0
  K  K5  1  0.490  0.240  0.250  1.0
  K  K6  1  0.990  0.240  0.750  1.0
  K  K7  1  0.510  0.760  0.750  1.0
  Eu  Eu8  1  0.250  0.000  0.250  1.0
  Eu  Eu9  1  0.750  0.000  0.750  1.0
  P  P10  1  0.871  0.076  0.205  1.0
  P  P11  1  0.129  0.924  0.795  1.0
  P  P12  1  0.629  0.334  0.705  1.0
  P  P13  1  0.371  0.666  0.295  1.0
  Se  Se14  1  0.097  0.223  0.474  1.0
  Se  Se15  1  0.251  0.777  0.875  1.0
  Se  Se16  1  0.403  0.376  0.625  1.0
  Se  Se17  1  0.249  0.624  0.026  1.0
  Se  Se18  1  0.903  0.777  0.526  1.0
  Se  Se19  1  0.749  0.223  0.125  1.0
  Se  Se20  1  0.597  0.624  0.375  1.0
  Se  Se21  1  0.751  0.376  0.974  1.0
  Se  Se22  1  0.396  0.928  0.532  1.0
  Se  Se23  1  0.604  0.072  0.468  1.0
  Se  Se24  1  0.104  0.136  0.032  1.0
  Se  Se25  1  0.896  0.864  0.968  1.0
  Se  Se26  1  0.242  0.988  0.746  1.0
  Se  Se27  1  0.758  0.012  0.254  1.0
  Se  Se28  1  0.258  0.504  0.246  1.0
  Se  Se29  1  0.742  0.496  0.754  1.0
[/CIF]
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The structure described by K4Eu(PSe4)2 crystallizes in the orthorhombic Ibam space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 8-coordinate geometry to one Se(2), one Se(3), and six equivalent Se(1) atoms. In the second K site, K(2) is bonded in a 6-coordinate geometry to two equivalent Se(2) and four equivalent Se(3) atoms. Eu(1) is bonded to four equivalent Se(1) and four equivalent Se(2) atoms to form distorted EuSe8 hexagonal bipyramids that share edges with two equivalent Eu(1)Se8 hexagonal bipyramids and edges with four equivalent P(1)Se4 tetrahedra. P(1) is bonded to one Se(2), one Se(3), and two equivalent Se(1) atoms to form PSe4 tetrahedra that share edges with two equivalent Eu(1)Se8 hexagonal bipyramids. There are three inequivalent Se sites. In the first Se site, Se(2) is bonded in a 6-coordinate geometry to one K(1), two equivalent K(2), two equivalent Eu(1), and one P(1) atom. In the second Se site, Se(3) is bonded to one K(1), four equivalent K(2), and one P(1) atom to form a mixture of distorted corner and edge-sharing SeK5P octahedra. The corner-sharing octahedral tilt angles range from 1-11°. In the third Se site, Se(1) is bonded in a 5-coordinate geometry to three equivalent K(1), one Eu(1), and one P(1) atom. is represented by the CIF file [CIF]
data_K4Eu(PSe4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   11.865
_cell_length_b   11.865
_cell_length_c   11.865
_cell_angle_alpha   134.101
_cell_angle_beta   128.292
_cell_angle_gamma   71.603
_symmetry_Int_Tables_number   1
_cell_volume   921.294
_cell_formula_units_Z   2
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  0.416  0.299  0.883  1.0
  K  K1  1  0.584  0.701  0.117  1.0
  K  K2  1  0.084  0.468  0.383  1.0
  K  K3  1  0.916  0.532  0.617  1.0
  K  K4  1  0.010  0.760  0.250  1.0
  K  K5  1  0.490  0.240  0.250  1.0
  K  K6  1  0.990  0.240  0.750  1.0
  K  K7  1  0.510  0.760  0.750  1.0
  Eu  Eu8  1  0.250  0.000  0.250  1.0
  Eu  Eu9  1  0.750  0.000  0.750  1.0
  P  P10  1  0.871  0.076  0.205  1.0
  P  P11  1  0.129  0.924  0.795  1.0
  P  P12  1  0.629  0.334  0.705  1.0
  P  P13  1  0.371  0.666  0.295  1.0
  Se  Se14  1  0.097  0.223  0.474  1.0
  Se  Se15  1  0.251  0.777  0.875  1.0
  Se  Se16  1  0.403  0.376  0.625  1.0
  Se  Se17  1  0.249  0.624  0.026  1.0
  Se  Se18  1  0.903  0.777  0.526  1.0
  Se  Se19  1  0.749  0.223  0.125  1.0
  Se  Se20  1  0.597  0.624  0.375  1.0
  Se  Se21  1  0.751  0.376  0.974  1.0
  Se  Se22  1  0.396  0.928  0.532  1.0
  Se  Se23  1  0.604  0.072  0.468  1.0
  Se  Se24  1  0.104  0.136  0.032  1.0
  Se  Se25  1  0.896  0.864  0.968  1.0
  Se  Se26  1  0.242  0.988  0.746  1.0
  Se  Se27  1  0.758  0.012  0.254  1.0
  Se  Se28  1  0.258  0.504  0.246  1.0
  Se  Se29  1  0.742  0.496  0.754  1.0
[/CIF]
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