The crystal structure described by EuY2O4 crystallizes in the monoclinic P2_1/m space group. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a 8-coordinate geometry to one O(1), one O(8), two equivalent O(3), two equivalent O(4), and two equivalent O(7) atoms. In the second Eu site, Eu(2) is bonded in a 8-coordinate geometry to one O(1), one O(8), two equivalent O(2), two equivalent O(5), and two equivalent O(6) atoms. There are four inequivalent Y sites. In the first Y site, Y(1) is bonded to one O(1), two equivalent O(4), and three equivalent O(2) atoms to form a mixture of corner and edge-sharing YO6 octahedra. The corner-sharing octahedral tilt angles range from 50-65°. In the second Y site, Y(2) is bonded to one O(5), two equivalent O(1), and three equivalent O(3) atoms to form a mixture of corner and edge-sharing YO6 octahedra. The corner-sharing octahedral tilt angles range from 50-63°. In the third Y site, Y(3) is bonded to one O(4), two equivalent O(8), and three equivalent O(6) atoms to form a mixture of corner and edge-sharing YO6 octahedra. The corner-sharing octahedral tilt angles range from 50-65°. In the fourth Y site, Y(4) is bonded to one O(8), two equivalent O(5), and three equivalent O(7) atoms to form a mixture of corner and edge-sharing YO6 octahedra. The corner-sharing octahedral tilt angles range from 50-63°. There are eight inequivalent O sites. In the first O site, O(1) is bonded to one Eu(1), one Eu(2), one Y(1), and two equivalent Y(2) atoms to form a mixture of distorted corner and edge-sharing OEu2Y3 trigonal bipyramids. In the second O site, O(2) is bonded to two equivalent Eu(2) and three equivalent Y(1) atoms to form a mixture of distorted corner and edge-sharing OEu2Y3 trigonal bipyramids. In the third O site, O(3) is bonded to two equivalent Eu(1) and three equivalent Y(2) atoms to form a mixture of corner and edge-sharing OEu2Y3 square pyramids. In the fourth O site, O(4) is bonded in a 5-coordinate geometry to two equivalent Eu(1), one Y(3), and two equivalent Y(1) atoms. In the fifth O site, O(5) is bonded in a 5-coordinate geometry to two equivalent Eu(2), one Y(2), and two equivalent Y(4) atoms. In the sixth O site, O(6) is bonded to two equivalent Eu(2) and three equivalent Y(3) atoms to form a mixture of corner and edge-sharing OEu2Y3 square pyramids. In the seventh O site, O(7) is bonded to two equivalent Eu(1) and three equivalent Y(4) atoms to form a mixture of distorted corner and edge-sharing OEu2Y3 trigonal bipyramids. In the eighth O site, O(8) is bonded in a 5-coordinate geometry to one Eu(1), one Eu(2), one Y(4), and two equivalent Y(3) atoms. is represented by the CIF file [CIF]
data_EuY2O4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.422
_cell_length_b   10.166
_cell_length_c   11.998
_cell_angle_alpha   89.816
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   417.362
_cell_formula_units_Z   4
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
  Eu  Eu0  1  0.750  0.245  0.149  1.0
  Eu  Eu1  1  0.250  0.254  0.652  1.0
  Eu  Eu2  1  0.750  0.746  0.348  1.0
  Eu  Eu3  1  0.250  0.755  0.851  1.0
  Y  Y4  1  0.750  0.076  0.388  1.0
  Y  Y5  1  0.750  0.079  0.891  1.0
  Y  Y6  1  0.250  0.421  0.391  1.0
  Y  Y7  1  0.250  0.427  0.888  1.0
  Y  Y8  1  0.750  0.573  0.112  1.0
  Y  Y9  1  0.750  0.579  0.609  1.0
  Y  Y10  1  0.250  0.921  0.109  1.0
  Y  Y11  1  0.250  0.924  0.612  1.0
  O  O12  1  0.250  0.021  0.783  1.0
  O  O13  1  0.750  0.080  0.578  1.0
  O  O14  1  0.250  0.124  0.024  1.0
  O  O15  1  0.250  0.210  0.323  1.0
  O  O16  1  0.750  0.292  0.827  1.0
  O  O17  1  0.750  0.374  0.524  1.0
  O  O18  1  0.250  0.420  0.078  1.0
  O  O19  1  0.750  0.484  0.286  1.0
  O  O20  1  0.250  0.516  0.714  1.0
  O  O21  1  0.750  0.580  0.922  1.0
  O  O22  1  0.250  0.626  0.476  1.0
  O  O23  1  0.250  0.708  0.173  1.0
  O  O24  1  0.750  0.790  0.677  1.0
  O  O25  1  0.750  0.876  0.976  1.0
  O  O26  1  0.250  0.920  0.422  1.0
  O  O27  1  0.750  0.979  0.217  1.0
[/CIF]
.
The crystal structure described by EuY2O4 crystallizes in the monoclinic P2_1/m space group. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a 8-coordinate geometry to one O(1), one O(8), two equivalent O(3), two equivalent O(4), and two equivalent O(7) atoms. In the second Eu site, Eu(2) is bonded in a 8-coordinate geometry to one O(1), one O(8), two equivalent O(2), two equivalent O(5), and two equivalent O(6) atoms. There are four inequivalent Y sites. In the first Y site, Y(1) is bonded to one O(1), two equivalent O(4), and three equivalent O(2) atoms to form a mixture of corner and edge-sharing YO6 octahedra. The corner-sharing octahedral tilt angles range from 50-65°. In the second Y site, Y(2) is bonded to one O(5), two equivalent O(1), and three equivalent O(3) atoms to form a mixture of corner and edge-sharing YO6 octahedra. The corner-sharing octahedral tilt angles range from 50-63°. In the third Y site, Y(3) is bonded to one O(4), two equivalent O(8), and three equivalent O(6) atoms to form a mixture of corner and edge-sharing YO6 octahedra. The corner-sharing octahedral tilt angles range from 50-65°. In the fourth Y site, Y(4) is bonded to one O(8), two equivalent O(5), and three equivalent O(7) atoms to form a mixture of corner and edge-sharing YO6 octahedra. The corner-sharing octahedral tilt angles range from 50-63°. There are eight inequivalent O sites. In the first O site, O(1) is bonded to one Eu(1), one Eu(2), one Y(1), and two equivalent Y(2) atoms to form a mixture of distorted corner and edge-sharing OEu2Y3 trigonal bipyramids. In the second O site, O(2) is bonded to two equivalent Eu(2) and three equivalent Y(1) atoms to form a mixture of distorted corner and edge-sharing OEu2Y3 trigonal bipyramids. In the third O site, O(3) is bonded to two equivalent Eu(1) and three equivalent Y(2) atoms to form a mixture of corner and edge-sharing OEu2Y3 square pyramids. In the fourth O site, O(4) is bonded in a 5-coordinate geometry to two equivalent Eu(1), one Y(3), and two equivalent Y(1) atoms. In the fifth O site, O(5) is bonded in a 5-coordinate geometry to two equivalent Eu(2), one Y(2), and two equivalent Y(4) atoms. In the sixth O site, O(6) is bonded to two equivalent Eu(2) and three equivalent Y(3) atoms to form a mixture of corner and edge-sharing OEu2Y3 square pyramids. In the seventh O site, O(7) is bonded to two equivalent Eu(1) and three equivalent Y(4) atoms to form a mixture of distorted corner and edge-sharing OEu2Y3 trigonal bipyramids. In the eighth O site, O(8) is bonded in a 5-coordinate geometry to one Eu(1), one Eu(2), one Y(4), and two equivalent Y(3) atoms. is represented by the CIF file [CIF]
data_EuY2O4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.422
_cell_length_b   10.166
_cell_length_c   11.998
_cell_angle_alpha   89.816
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   417.362
_cell_formula_units_Z   4
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
  Eu  Eu0  1  0.750  0.245  0.149  1.0
  Eu  Eu1  1  0.250  0.254  0.652  1.0
  Eu  Eu2  1  0.750  0.746  0.348  1.0
  Eu  Eu3  1  0.250  0.755  0.851  1.0
  Y  Y4  1  0.750  0.076  0.388  1.0
  Y  Y5  1  0.750  0.079  0.891  1.0
  Y  Y6  1  0.250  0.421  0.391  1.0
  Y  Y7  1  0.250  0.427  0.888  1.0
  Y  Y8  1  0.750  0.573  0.112  1.0
  Y  Y9  1  0.750  0.579  0.609  1.0
  Y  Y10  1  0.250  0.921  0.109  1.0
  Y  Y11  1  0.250  0.924  0.612  1.0
  O  O12  1  0.250  0.021  0.783  1.0
  O  O13  1  0.750  0.080  0.578  1.0
  O  O14  1  0.250  0.124  0.024  1.0
  O  O15  1  0.250  0.210  0.323  1.0
  O  O16  1  0.750  0.292  0.827  1.0
  O  O17  1  0.750  0.374  0.524  1.0
  O  O18  1  0.250  0.420  0.078  1.0
  O  O19  1  0.750  0.484  0.286  1.0
  O  O20  1  0.250  0.516  0.714  1.0
  O  O21  1  0.750  0.580  0.922  1.0
  O  O22  1  0.250  0.626  0.476  1.0
  O  O23  1  0.250  0.708  0.173  1.0
  O  O24  1  0.750  0.790  0.677  1.0
  O  O25  1  0.750  0.876  0.976  1.0
  O  O26  1  0.250  0.920  0.422  1.0
  O  O27  1  0.750  0.979  0.217  1.0
[/CIF]
.