The material structure described by Rb2MgNb2(TeO6)2 crystallizes in the monoclinic C2/m space group. Rb(1) is bonded in a 4-coordinate geometry to one O(1), one O(2), and two equivalent O(4) atoms. Mg(1) is bonded in a distorted square co-planar geometry to four equivalent O(3) atoms. Nb(1) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms to form NbO6 octahedra that share corners with two equivalent Nb(1)O6 octahedra, corners with two equivalent Te(1)O6 octahedra, and corners with two equivalent Te(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 37-66°. There are two inequivalent Te sites. In the first Te site, Te(1) is bonded to two equivalent O(1) and four equivalent O(4) atoms to form TeO6 octahedra that share corners with two equivalent Te(2)O6 octahedra and corners with four equivalent Nb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 37-46°. In the second Te site, Te(2) is bonded to two equivalent O(1) and four equivalent O(3) atoms to form TeO6 octahedra that share corners with two equivalent Te(1)O6 octahedra and corners with four equivalent Nb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 46-66°. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Rb(1), one Te(1), and one Te(2) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Rb(1) and two equivalent Nb(1) atoms. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Mg(1), one Nb(1), and one Te(2) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Rb(1), one Nb(1), and one Te(1) atom. is represented by the CIF file [CIF]
data_Rb2MgNb2(TeO6)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.408
_cell_length_b   7.261
_cell_length_c   7.535
_cell_angle_alpha   90.000
_cell_angle_beta   60.986
_cell_angle_gamma   119.346
_symmetry_Int_Tables_number   1
_cell_volume   293.582
_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
  Rb  Rb0  1  0.671  0.335  0.491  1.0
  Rb  Rb1  1  0.329  0.665  0.509  1.0
  Mg  Mg2  1  0.000  0.500  0.000  1.0
  Nb  Nb3  1  0.500  0.500  0.000  1.0
  Nb  Nb4  1  0.500  0.000  0.000  1.0
  Te  Te5  1  0.000  0.000  0.500  1.0
  Te  Te6  1  0.000  0.000  0.000  1.0
  O  O7  1  0.852  0.926  0.331  1.0
  O  O8  1  0.542  0.271  0.900  1.0
  O  O9  1  0.228  0.840  0.944  1.0
  O  O10  1  0.238  0.307  0.314  1.0
  O  O11  1  0.228  0.388  0.944  1.0
  O  O12  1  0.238  0.931  0.314  1.0
  O  O13  1  0.148  0.074  0.669  1.0
  O  O14  1  0.458  0.729  0.100  1.0
  O  O15  1  0.772  0.160  0.056  1.0
  O  O16  1  0.762  0.693  0.686  1.0
  O  O17  1  0.772  0.612  0.056  1.0
  O  O18  1  0.762  0.069  0.686  1.0
[/CIF]
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The material structure described by Rb2MgNb2(TeO6)2 crystallizes in the monoclinic C2/m space group. Rb(1) is bonded in a 4-coordinate geometry to one O(1), one O(2), and two equivalent O(4) atoms. Mg(1) is bonded in a distorted square co-planar geometry to four equivalent O(3) atoms. Nb(1) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms to form NbO6 octahedra that share corners with two equivalent Nb(1)O6 octahedra, corners with two equivalent Te(1)O6 octahedra, and corners with two equivalent Te(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 37-66°. There are two inequivalent Te sites. In the first Te site, Te(1) is bonded to two equivalent O(1) and four equivalent O(4) atoms to form TeO6 octahedra that share corners with two equivalent Te(2)O6 octahedra and corners with four equivalent Nb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 37-46°. In the second Te site, Te(2) is bonded to two equivalent O(1) and four equivalent O(3) atoms to form TeO6 octahedra that share corners with two equivalent Te(1)O6 octahedra and corners with four equivalent Nb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 46-66°. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Rb(1), one Te(1), and one Te(2) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Rb(1) and two equivalent Nb(1) atoms. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Mg(1), one Nb(1), and one Te(2) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Rb(1), one Nb(1), and one Te(1) atom. is represented by the CIF file [CIF]
data_Rb2MgNb2(TeO6)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.408
_cell_length_b   7.261
_cell_length_c   7.535
_cell_angle_alpha   90.000
_cell_angle_beta   60.986
_cell_angle_gamma   119.346
_symmetry_Int_Tables_number   1
_cell_volume   293.582
_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
  Rb  Rb0  1  0.671  0.335  0.491  1.0
  Rb  Rb1  1  0.329  0.665  0.509  1.0
  Mg  Mg2  1  0.000  0.500  0.000  1.0
  Nb  Nb3  1  0.500  0.500  0.000  1.0
  Nb  Nb4  1  0.500  0.000  0.000  1.0
  Te  Te5  1  0.000  0.000  0.500  1.0
  Te  Te6  1  0.000  0.000  0.000  1.0
  O  O7  1  0.852  0.926  0.331  1.0
  O  O8  1  0.542  0.271  0.900  1.0
  O  O9  1  0.228  0.840  0.944  1.0
  O  O10  1  0.238  0.307  0.314  1.0
  O  O11  1  0.228  0.388  0.944  1.0
  O  O12  1  0.238  0.931  0.314  1.0
  O  O13  1  0.148  0.074  0.669  1.0
  O  O14  1  0.458  0.729  0.100  1.0
  O  O15  1  0.772  0.160  0.056  1.0
  O  O16  1  0.762  0.693  0.686  1.0
  O  O17  1  0.772  0.612  0.056  1.0
  O  O18  1  0.762  0.069  0.686  1.0
[/CIF]
.