The material described by Li3Nb2CrO6 is Caswellsilverite-derived structured and crystallizes in the monoclinic C2/m space group. There are two inequivalent Li sites. In the first Li site, Li(1) is bonded to two equivalent O(2) and four equivalent O(3) atoms to form LiO6 octahedra that share corners with two equivalent Nb(1)O6 octahedra, corners with four equivalent Cr(1)O6 octahedra, edges with two equivalent Li(1)O6 octahedra, edges with two equivalent Cr(1)O6 octahedra, edges with four equivalent Li(2)O6 octahedra, and edges with four equivalent Nb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 9-10°. In the second Li site, Li(2) is bonded to one O(3), two equivalent O(2), and three equivalent O(1) atoms to form distorted LiO6 octahedra that share  a cornercorner with one Cr(1)O6 octahedra, corners with five equivalent Nb(1)O6 octahedra, edges with two equivalent Li(1)O6 octahedra, edges with two equivalent Cr(1)O6 octahedra, edges with four equivalent Li(2)O6 octahedra, and edges with four equivalent Nb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 5-8°. Nb(1) is bonded to one O(3), two equivalent O(1), and three equivalent O(2) atoms to form NbO6 octahedra that share  a cornercorner with one Li(1)O6 octahedra, corners with five equivalent Li(2)O6 octahedra, edges with two equivalent Li(1)O6 octahedra, edges with two equivalent Cr(1)O6 octahedra, edges with four equivalent Li(2)O6 octahedra, and edges with four equivalent Nb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 6-10°. Cr(1) is bonded to two equivalent O(1) and four equivalent O(3) atoms to form CrO6 octahedra that share corners with two equivalent Li(2)O6 octahedra, corners with four equivalent Li(1)O6 octahedra, edges with two equivalent Li(1)O6 octahedra, edges with two equivalent Cr(1)O6 octahedra, edges with four equivalent Li(2)O6 octahedra, and edges with four equivalent Nb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 5-9°. There are three inequivalent O sites. In the first O site, O(1) is bonded to three equivalent Li(2), two equivalent Nb(1), and one Cr(1) atom to form OLi3Nb2Cr octahedra that share  a cornercorner with one O(1)Li3Nb2Cr octahedra,  a cornercorner with one O(3)Li3NbCr2 octahedra, corners with four equivalent O(2)Li3Nb3 octahedra, edges with four equivalent O(1)Li3Nb2Cr octahedra, edges with four equivalent O(2)Li3Nb3 octahedra, and edges with four equivalent O(3)Li3NbCr2 octahedra. The corner-sharing octahedral tilt angles range from 0-15°. In the second O site, O(2) is bonded to one Li(1), two equivalent Li(2), and three equivalent Nb(1) atoms to form OLi3Nb3 octahedra that share  a cornercorner with one O(2)Li3Nb3 octahedra,  a cornercorner with one O(3)Li3NbCr2 octahedra, corners with four equivalent O(1)Li3Nb2Cr octahedra, edges with four equivalent O(1)Li3Nb2Cr octahedra, edges with four equivalent O(2)Li3Nb3 octahedra, and edges with four equivalent O(3)Li3NbCr2 octahedra. The corner-sharing octahedral tilt angles range from 0-15°. In the third O site, O(3) is bonded to one Li(2), two equivalent Li(1), one Nb(1), and two equivalent Cr(1) atoms to form OLi3NbCr2 octahedra that share  a cornercorner with one O(1)Li3Nb2Cr octahedra,  a cornercorner with one O(2)Li3Nb3 octahedra, corners with four equivalent O(3)Li3NbCr2 octahedra, edges with four equivalent O(1)Li3Nb2Cr octahedra, edges with four equivalent O(2)Li3Nb3 octahedra, and edges with four equivalent O(3)Li3NbCr2 octahedra. The corner-sharing octahedral tilt angles range from 0-12°. is represented by the Crystallographic Information File (CIF) [CIF]
data_Li3Nb2CrO6
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   2.917
_cell_length_b   6.167
_cell_length_c   7.014
_cell_angle_alpha   106.017
_cell_angle_beta   101.971
_cell_angle_gamma   90.029
_symmetry_Int_Tables_number   1
_cell_volume   118.408
_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
  Cr  Cr0  1  0.333  0.667  0.667  1.0
  Li  Li1  1  0.333  0.167  0.667  1.0
  Li  Li2  1  0.986  0.503  0.973  1.0
  Li  Li3  1  0.680  0.830  0.360  1.0
  Nb  Nb4  1  0.010  0.022  0.020  1.0
  Nb  Nb5  1  0.657  0.311  0.313  1.0
  O  O6  1  0.489  0.754  0.977  1.0
  O  O7  1  0.178  0.579  0.356  1.0
  O  O8  1  0.177  0.066  0.354  1.0
  O  O9  1  0.489  0.268  0.980  1.0
  O  O10  1  0.823  0.432  0.646  1.0
  O  O11  1  0.844  0.902  0.687  1.0
[/CIF]
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The material described by Li3Nb2CrO6 is Caswellsilverite-derived structured and crystallizes in the monoclinic C2/m space group. There are two inequivalent Li sites. In the first Li site, Li(1) is bonded to two equivalent O(2) and four equivalent O(3) atoms to form LiO6 octahedra that share corners with two equivalent Nb(1)O6 octahedra, corners with four equivalent Cr(1)O6 octahedra, edges with two equivalent Li(1)O6 octahedra, edges with two equivalent Cr(1)O6 octahedra, edges with four equivalent Li(2)O6 octahedra, and edges with four equivalent Nb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 9-10°. In the second Li site, Li(2) is bonded to one O(3), two equivalent O(2), and three equivalent O(1) atoms to form distorted LiO6 octahedra that share  a cornercorner with one Cr(1)O6 octahedra, corners with five equivalent Nb(1)O6 octahedra, edges with two equivalent Li(1)O6 octahedra, edges with two equivalent Cr(1)O6 octahedra, edges with four equivalent Li(2)O6 octahedra, and edges with four equivalent Nb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 5-8°. Nb(1) is bonded to one O(3), two equivalent O(1), and three equivalent O(2) atoms to form NbO6 octahedra that share  a cornercorner with one Li(1)O6 octahedra, corners with five equivalent Li(2)O6 octahedra, edges with two equivalent Li(1)O6 octahedra, edges with two equivalent Cr(1)O6 octahedra, edges with four equivalent Li(2)O6 octahedra, and edges with four equivalent Nb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 6-10°. Cr(1) is bonded to two equivalent O(1) and four equivalent O(3) atoms to form CrO6 octahedra that share corners with two equivalent Li(2)O6 octahedra, corners with four equivalent Li(1)O6 octahedra, edges with two equivalent Li(1)O6 octahedra, edges with two equivalent Cr(1)O6 octahedra, edges with four equivalent Li(2)O6 octahedra, and edges with four equivalent Nb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 5-9°. There are three inequivalent O sites. In the first O site, O(1) is bonded to three equivalent Li(2), two equivalent Nb(1), and one Cr(1) atom to form OLi3Nb2Cr octahedra that share  a cornercorner with one O(1)Li3Nb2Cr octahedra,  a cornercorner with one O(3)Li3NbCr2 octahedra, corners with four equivalent O(2)Li3Nb3 octahedra, edges with four equivalent O(1)Li3Nb2Cr octahedra, edges with four equivalent O(2)Li3Nb3 octahedra, and edges with four equivalent O(3)Li3NbCr2 octahedra. The corner-sharing octahedral tilt angles range from 0-15°. In the second O site, O(2) is bonded to one Li(1), two equivalent Li(2), and three equivalent Nb(1) atoms to form OLi3Nb3 octahedra that share  a cornercorner with one O(2)Li3Nb3 octahedra,  a cornercorner with one O(3)Li3NbCr2 octahedra, corners with four equivalent O(1)Li3Nb2Cr octahedra, edges with four equivalent O(1)Li3Nb2Cr octahedra, edges with four equivalent O(2)Li3Nb3 octahedra, and edges with four equivalent O(3)Li3NbCr2 octahedra. The corner-sharing octahedral tilt angles range from 0-15°. In the third O site, O(3) is bonded to one Li(2), two equivalent Li(1), one Nb(1), and two equivalent Cr(1) atoms to form OLi3NbCr2 octahedra that share  a cornercorner with one O(1)Li3Nb2Cr octahedra,  a cornercorner with one O(2)Li3Nb3 octahedra, corners with four equivalent O(3)Li3NbCr2 octahedra, edges with four equivalent O(1)Li3Nb2Cr octahedra, edges with four equivalent O(2)Li3Nb3 octahedra, and edges with four equivalent O(3)Li3NbCr2 octahedra. The corner-sharing octahedral tilt angles range from 0-12°. is represented by the Crystallographic Information File (CIF) [CIF]
data_Li3Nb2CrO6
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   2.917
_cell_length_b   6.167
_cell_length_c   7.014
_cell_angle_alpha   106.017
_cell_angle_beta   101.971
_cell_angle_gamma   90.029
_symmetry_Int_Tables_number   1
_cell_volume   118.408
_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
  Cr  Cr0  1  0.333  0.667  0.667  1.0
  Li  Li1  1  0.333  0.167  0.667  1.0
  Li  Li2  1  0.986  0.503  0.973  1.0
  Li  Li3  1  0.680  0.830  0.360  1.0
  Nb  Nb4  1  0.010  0.022  0.020  1.0
  Nb  Nb5  1  0.657  0.311  0.313  1.0
  O  O6  1  0.489  0.754  0.977  1.0
  O  O7  1  0.178  0.579  0.356  1.0
  O  O8  1  0.177  0.066  0.354  1.0
  O  O9  1  0.489  0.268  0.980  1.0
  O  O10  1  0.823  0.432  0.646  1.0
  O  O11  1  0.844  0.902  0.687  1.0
[/CIF]
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