The material described by BeNd2Ga2O7 is Esseneite-like structured and crystallizes in the tetragonal P-42_1m space group. Be(1) is bonded to four equivalent O(3) atoms to form BeO4 tetrahedra that share corners with four equivalent Ga(1)O4 tetrahedra. Nd(1) is bonded in a 8-coordinate geometry to one O(1), three equivalent O(2), and four equivalent O(3) atoms. Ga(1) is bonded to one O(1), one O(2), and two equivalent O(3) atoms to form GaO4 tetrahedra that share  a cornercorner with one Ga(1)O4 tetrahedra and corners with two equivalent Be(1)O4 tetrahedra. There are three inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Nd(1) and two equivalent Ga(1) atoms to form a mixture of distorted corner and edge-sharing ONd2Ga2 tetrahedra. In the second O site, O(2) is bonded to three equivalent Nd(1) and one Ga(1) atom to form ONd3Ga tetrahedra that share corners with two equivalent O(1)Nd2Ga2 tetrahedra, corners with four equivalent O(2)Nd3Ga tetrahedra,  an edgeedge with one O(1)Nd2Ga2 tetrahedra, and  an edgeedge with one O(2)Nd3Ga tetrahedra. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Be(1), two equivalent Nd(1), and one Ga(1) atom. is represented by the CIF file [CIF]
data_Nd2BeGa2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.240
_cell_length_b   7.746
_cell_length_c   7.746
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   314.367
_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
  Nd  Nd0  1  0.517  0.166  0.666  1.0
  Nd  Nd1  1  0.517  0.834  0.334  1.0
  Nd  Nd2  1  0.483  0.666  0.834  1.0
  Nd  Nd3  1  0.483  0.334  0.166  1.0
  Be  Be4  1  0.000  0.000  0.000  1.0
  Be  Be5  1  0.000  0.500  0.500  1.0
  Ga  Ga6  1  0.970  0.651  0.151  1.0
  Ga  Ga7  1  0.970  0.349  0.849  1.0
  Ga  Ga8  1  0.030  0.151  0.349  1.0
  Ga  Ga9  1  0.030  0.849  0.651  1.0
  O  O10  1  0.197  0.000  0.500  1.0
  O  O11  1  0.803  0.500  0.000  1.0
  O  O12  1  0.320  0.635  0.135  1.0
  O  O13  1  0.320  0.365  0.865  1.0
  O  O14  1  0.680  0.135  0.365  1.0
  O  O15  1  0.680  0.865  0.635  1.0
  O  O16  1  0.193  0.092  0.145  1.0
  O  O17  1  0.193  0.908  0.855  1.0
  O  O18  1  0.807  0.145  0.908  1.0
  O  O19  1  0.807  0.408  0.645  1.0
  O  O20  1  0.807  0.855  0.092  1.0
  O  O21  1  0.807  0.592  0.355  1.0
  O  O22  1  0.193  0.355  0.408  1.0
  O  O23  1  0.193  0.645  0.592  1.0
[/CIF]
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The material described by BeNd2Ga2O7 is Esseneite-like structured and crystallizes in the tetragonal P-42_1m space group. Be(1) is bonded to four equivalent O(3) atoms to form BeO4 tetrahedra that share corners with four equivalent Ga(1)O4 tetrahedra. Nd(1) is bonded in a 8-coordinate geometry to one O(1), three equivalent O(2), and four equivalent O(3) atoms. Ga(1) is bonded to one O(1), one O(2), and two equivalent O(3) atoms to form GaO4 tetrahedra that share  a cornercorner with one Ga(1)O4 tetrahedra and corners with two equivalent Be(1)O4 tetrahedra. There are three inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Nd(1) and two equivalent Ga(1) atoms to form a mixture of distorted corner and edge-sharing ONd2Ga2 tetrahedra. In the second O site, O(2) is bonded to three equivalent Nd(1) and one Ga(1) atom to form ONd3Ga tetrahedra that share corners with two equivalent O(1)Nd2Ga2 tetrahedra, corners with four equivalent O(2)Nd3Ga tetrahedra,  an edgeedge with one O(1)Nd2Ga2 tetrahedra, and  an edgeedge with one O(2)Nd3Ga tetrahedra. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Be(1), two equivalent Nd(1), and one Ga(1) atom. is represented by the CIF file [CIF]
data_Nd2BeGa2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.240
_cell_length_b   7.746
_cell_length_c   7.746
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   314.367
_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
  Nd  Nd0  1  0.517  0.166  0.666  1.0
  Nd  Nd1  1  0.517  0.834  0.334  1.0
  Nd  Nd2  1  0.483  0.666  0.834  1.0
  Nd  Nd3  1  0.483  0.334  0.166  1.0
  Be  Be4  1  0.000  0.000  0.000  1.0
  Be  Be5  1  0.000  0.500  0.500  1.0
  Ga  Ga6  1  0.970  0.651  0.151  1.0
  Ga  Ga7  1  0.970  0.349  0.849  1.0
  Ga  Ga8  1  0.030  0.151  0.349  1.0
  Ga  Ga9  1  0.030  0.849  0.651  1.0
  O  O10  1  0.197  0.000  0.500  1.0
  O  O11  1  0.803  0.500  0.000  1.0
  O  O12  1  0.320  0.635  0.135  1.0
  O  O13  1  0.320  0.365  0.865  1.0
  O  O14  1  0.680  0.135  0.365  1.0
  O  O15  1  0.680  0.865  0.635  1.0
  O  O16  1  0.193  0.092  0.145  1.0
  O  O17  1  0.193  0.908  0.855  1.0
  O  O18  1  0.807  0.145  0.908  1.0
  O  O19  1  0.807  0.408  0.645  1.0
  O  O20  1  0.807  0.855  0.092  1.0
  O  O21  1  0.807  0.592  0.355  1.0
  O  O22  1  0.193  0.355  0.408  1.0
  O  O23  1  0.193  0.645  0.592  1.0
[/CIF]
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