The compound described by Eu3NbO7 crystallizes in the orthorhombic Cmcm space group. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded to one O(3), two equivalent O(1), and four equivalent O(2) atoms to form distorted EuO7 pentagonal bipyramids that share corners with two equivalent Nb(1)O6 octahedra, corners with three equivalent Eu(1)O7 pentagonal bipyramids, edges with two equivalent Nb(1)O6 octahedra, and edges with two equivalent Eu(1)O7 pentagonal bipyramids. The corner-sharing octahedral tilt angles are 42°. In the second Eu site, Eu(2) is bonded in a body-centered cubic geometry to four equivalent O(1) and four equivalent O(2) atoms. Nb(1) is bonded to two equivalent O(3) and four equivalent O(2) atoms to form NbO6 octahedra that share corners with two equivalent Nb(1)O6 octahedra, corners with four equivalent Eu(1)O7 pentagonal bipyramids, and edges with four equivalent Eu(1)O7 pentagonal bipyramids. The corner-sharing octahedral tilt angles are 31°. There are three inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Eu(1) and two equivalent Eu(2) atoms to form a mixture of corner and edge-sharing OEu4 tetrahedra. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Eu(2), two equivalent Eu(1), and one Nb(1) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to two equivalent Eu(1) and two equivalent Nb(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Eu3NbO7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.539
_cell_length_b   6.539
_cell_length_c   7.680
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   111.758
_symmetry_Int_Tables_number   1
_cell_volume   304.967
_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
  Eu  Eu0  1  0.521  0.060  0.250  1.0
  Eu  Eu1  1  0.940  0.479  0.750  1.0
  Eu  Eu2  1  0.000  0.000  0.000  1.0
  Eu  Eu3  1  0.000  0.000  0.500  1.0
  Eu  Eu4  1  0.479  0.940  0.750  1.0
  Eu  Eu5  1  0.060  0.521  0.250  1.0
  Nb  Nb6  1  0.500  0.500  0.000  1.0
  Nb  Nb7  1  0.500  0.500  0.500  1.0
  O  O8  1  0.892  0.154  0.250  1.0
  O  O9  1  0.846  0.108  0.750  1.0
  O  O10  1  0.433  0.178  0.534  1.0
  O  O11  1  0.822  0.567  0.034  1.0
  O  O12  1  0.822  0.567  0.466  1.0
  O  O13  1  0.433  0.178  0.966  1.0
  O  O14  1  0.571  0.571  0.750  1.0
  O  O15  1  0.429  0.429  0.250  1.0
  O  O16  1  0.178  0.433  0.534  1.0
  O  O17  1  0.178  0.433  0.966  1.0
  O  O18  1  0.567  0.822  0.034  1.0
  O  O19  1  0.567  0.822  0.466  1.0
  O  O20  1  0.154  0.892  0.250  1.0
  O  O21  1  0.108  0.846  0.750  1.0
[/CIF]
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The compound described by Eu3NbO7 crystallizes in the orthorhombic Cmcm space group. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded to one O(3), two equivalent O(1), and four equivalent O(2) atoms to form distorted EuO7 pentagonal bipyramids that share corners with two equivalent Nb(1)O6 octahedra, corners with three equivalent Eu(1)O7 pentagonal bipyramids, edges with two equivalent Nb(1)O6 octahedra, and edges with two equivalent Eu(1)O7 pentagonal bipyramids. The corner-sharing octahedral tilt angles are 42°. In the second Eu site, Eu(2) is bonded in a body-centered cubic geometry to four equivalent O(1) and four equivalent O(2) atoms. Nb(1) is bonded to two equivalent O(3) and four equivalent O(2) atoms to form NbO6 octahedra that share corners with two equivalent Nb(1)O6 octahedra, corners with four equivalent Eu(1)O7 pentagonal bipyramids, and edges with four equivalent Eu(1)O7 pentagonal bipyramids. The corner-sharing octahedral tilt angles are 31°. There are three inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Eu(1) and two equivalent Eu(2) atoms to form a mixture of corner and edge-sharing OEu4 tetrahedra. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Eu(2), two equivalent Eu(1), and one Nb(1) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to two equivalent Eu(1) and two equivalent Nb(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Eu3NbO7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.539
_cell_length_b   6.539
_cell_length_c   7.680
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   111.758
_symmetry_Int_Tables_number   1
_cell_volume   304.967
_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
  Eu  Eu0  1  0.521  0.060  0.250  1.0
  Eu  Eu1  1  0.940  0.479  0.750  1.0
  Eu  Eu2  1  0.000  0.000  0.000  1.0
  Eu  Eu3  1  0.000  0.000  0.500  1.0
  Eu  Eu4  1  0.479  0.940  0.750  1.0
  Eu  Eu5  1  0.060  0.521  0.250  1.0
  Nb  Nb6  1  0.500  0.500  0.000  1.0
  Nb  Nb7  1  0.500  0.500  0.500  1.0
  O  O8  1  0.892  0.154  0.250  1.0
  O  O9  1  0.846  0.108  0.750  1.0
  O  O10  1  0.433  0.178  0.534  1.0
  O  O11  1  0.822  0.567  0.034  1.0
  O  O12  1  0.822  0.567  0.466  1.0
  O  O13  1  0.433  0.178  0.966  1.0
  O  O14  1  0.571  0.571  0.750  1.0
  O  O15  1  0.429  0.429  0.250  1.0
  O  O16  1  0.178  0.433  0.534  1.0
  O  O17  1  0.178  0.433  0.966  1.0
  O  O18  1  0.567  0.822  0.034  1.0
  O  O19  1  0.567  0.822  0.466  1.0
  O  O20  1  0.154  0.892  0.250  1.0
  O  O21  1  0.108  0.846  0.750  1.0
[/CIF]
.