data_Mn2NiAg
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.88
_cell_length_b   8.88
_cell_length_c   8.88
_cell_angle_alpha   16.68
_cell_angle_beta   16.68
_cell_angle_gamma   16.68
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Mn2NiAg
_chemical_formula_sum   'Mn2 Ni1 Ag1'
_cell_volume   50.37
_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
  Mn  Mn1  1  0.0  0.0  0.77  1.0
  Mn  Mn2  1  0.0  0.0  0.51  1.0
  Ni  Ni3  1  0.0  0.0  0.0  1.0
  Ag  Ag0  1  0.0  0.0  0.14  1.0

data_Mn2NiAg
_symmetry_space_group_name_H-M   Cm
_cell_length_a   4.46
_cell_length_b   2.58
_cell_length_c   8.88
_cell_angle_alpha   90.0
_cell_angle_beta   99.64
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   Mn2NiAg
_chemical_formula_sum   'Mn4 Ni2 Ag2'
_cell_volume   100.74
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  'x, -y, z'
  3  'x+1/2, y+1/2, z'
  4  'x+1/2, -y+1/2, 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
  Mn  Mn0  2  0.0  0.0  0.23  1.0
  Mn  Mn1  2  0.0  0.0  0.49  1.0
  Ni  Ni2  2  0.0  0.0  0.0  1.0
  Ag  Ag3  2  0.0  0.0  0.86  1.0

Mn Mn Ni Ag
Mn2NiAg crystallizes in the monoclinic Cm space group. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded in a distorted single-bond geometry to one Mn(2) and one Ni(1) atom. The Mn(1)-Mn(2) bond length is 2.36 Å. The Mn(1)-Ni(1) bond length is 2.04 Å. In the second Mn site, Mn(2) is bonded to one Mn(1), six equivalent Mn(2), and one Ag(1) atom to form a mixture of distorted corner and edge-sharing MnMn7Ag hexagonal bipyramids. All Mn(2)-Mn(2) bond lengths are 2.58 Å. The Mn(2)-Ag(1) bond length is 3.26 Å. Ni(1) is bonded in a linear geometry to one Mn(1) and one Ag(1) atom. The Ni(1)-Ag(1) bond length is 1.22 Å. Ag(1) is bonded in a single-bond geometry to one Mn(2) and one Ni(1) atom.