data_SrYMn2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.18
_cell_length_b   5.18
_cell_length_c   5.18
_cell_angle_alpha   60.0
_cell_angle_beta   60.0
_cell_angle_gamma   60.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   SrYMn2
_chemical_formula_sum   'Sr1 Y1 Mn2'
_cell_volume   98.27
_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
  Sr  Sr2  1  0.66  0.66  0.66  1.0
  Y  Y3  1  0.83  0.83  0.83  1.0
  Mn  Mn0  1  0.0  0.0  0.0  1.0
  Mn  Mn1  1  0.49  0.49  0.49  1.0

data_SrYMn2
_symmetry_space_group_name_H-M   R3m
_cell_length_a   5.18
_cell_length_b   5.18
_cell_length_c   12.69
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   SrYMn2
_chemical_formula_sum   'Sr3 Y3 Mn6'
_cell_volume   294.81
_cell_formula_units_Z   3
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  '-y, x-y, z'
  3  '-x+y, -x, z'
  4  '-y, -x, z'
  5  '-x+y, y, z'
  6  'x, x-y, z'
  7  'x+1/3, y+2/3, z+2/3'
  8  '-y+1/3, x-y+2/3, z+2/3'
  9  '-x+y+1/3, -x+2/3, z+2/3'
  10  '-y+1/3, -x+2/3, z+2/3'
  11  '-x+y+1/3, y+2/3, z+2/3'
  12  'x+1/3, x-y+2/3, z+2/3'
  13  'x+2/3, y+1/3, z+1/3'
  14  '-y+2/3, x-y+1/3, z+1/3'
  15  '-x+y+2/3, -x+1/3, z+1/3'
  16  '-y+2/3, -x+1/3, z+1/3'
  17  '-x+y+2/3, y+1/3, z+1/3'
  18  'x+2/3, x-y+1/3, z+1/3'
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
  Sr  Sr0  3  0.0  0.0  0.34  1.0
  Y  Y1  3  0.0  0.0  0.17  1.0
  Mn  Mn2  3  0.0  0.0  0.0  1.0
  Mn  Mn3  3  0.0  0.0  0.51  1.0

Sr Y Mn Mn
SrYMn2 crystallizes in the trigonal R3m space group. Sr(1) is bonded to one Y(1), one Mn(2), and three equivalent Mn(1) atoms to form distorted SrYMn4 trigonal bipyramids that share corners with six equivalent Sr(1)YMn4 trigonal bipyramids,  a cornercorner with one Mn(1)Sr3Y trigonal pyramid, and edges with three equivalent Y(1)SrMn4 trigonal bipyramids. The Sr(1)-Y(1) bond length is 2.14 Å. The Sr(1)-Mn(2) bond length is 2.14 Å. All Sr(1)-Mn(1) bond lengths are 2.99 Å. Y(1) is bonded to one Sr(1), one Mn(1), and three equivalent Mn(2) atoms to form distorted YSrMn4 trigonal bipyramids that share corners with six equivalent Y(1)SrMn4 trigonal bipyramids, corners with three equivalent Mn(1)Sr3Y trigonal pyramids, and edges with three equivalent Sr(1)YMn4 trigonal bipyramids. The Y(1)-Mn(1) bond length is 2.14 Å. All Y(1)-Mn(2) bond lengths are 2.99 Å. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to three equivalent Sr(1) and one Y(1) atom to form distorted MnSr3Y trigonal pyramids that share  a cornercorner with one Sr(1)YMn4 trigonal bipyramid, corners with three equivalent Y(1)SrMn4 trigonal bipyramids, and corners with six equivalent Mn(1)Sr3Y trigonal pyramids. In the second Mn site, Mn(2) is bonded in a distorted single-bond geometry to one Sr(1) and three equivalent Y(1) atoms.