The material structure described by ErTa5Ag2O15 crystallizes in the tetragonal P4/mbm space group. Er(1) is bonded to four equivalent O(1) and eight equivalent O(4) atoms to form ErO12 cuboctahedra that share faces with two equivalent Er(1)O12 cuboctahedra and faces with eight equivalent Ta(2)O6 octahedra. There are two inequivalent Ta sites. In the first Ta site, Ta(1) is bonded to two equivalent O(3) and four equivalent O(5) atoms to form corner-sharing TaO6 octahedra. The corner-sharing octahedral tilt angles range from 0-32°. In the second Ta site, Ta(2) is bonded to one O(2), one O(5), two equivalent O(1), and two equivalent O(4) atoms to form TaO6 octahedra that share  a cornercorner with one Ta(1)O6 octahedra, corners with five equivalent Ta(2)O6 octahedra, and faces with two equivalent Er(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 13-42°. Ag(1) is bonded in an L-shaped geometry to two equivalent O(2) atoms. There are five inequivalent O sites. In the first O site, O(5) is bonded in a bent 150 degrees geometry to one Ta(1) and one Ta(2) atom. In the second O site, O(1) is bonded in a distorted T-shaped geometry to one Er(1) and two equivalent Ta(2) atoms. In the third O site, O(2) is bonded in a 4-coordinate geometry to two equivalent Ta(2) and two equivalent Ag(1) atoms. In the fourth O site, O(3) is bonded in a linear geometry to two equivalent Ta(1) atoms. In the fifth O site, O(4) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Er(1) and two equivalent Ta(2) atoms. is represented by the CIF card [CIF]
data_ErTa5Ag2O15
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   12.593
_cell_length_b   12.593
_cell_length_c   3.916
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   621.094
_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
  Er  Er0  1  0.000  0.000  0.500  1.0
  Er  Er1  1  0.500  0.500  0.500  1.0
  Ta  Ta2  1  0.500  0.000  0.000  1.0
  Ta  Ta3  1  0.000  0.500  0.000  1.0
  Ta  Ta4  1  0.211  0.079  0.000  1.0
  Ta  Ta5  1  0.789  0.921  0.000  1.0
  Ta  Ta6  1  0.079  0.789  0.000  1.0
  Ta  Ta7  1  0.711  0.421  0.000  1.0
  Ta  Ta8  1  0.921  0.211  0.000  1.0
  Ta  Ta9  1  0.289  0.579  0.000  1.0
  Ta  Ta10  1  0.579  0.711  0.000  1.0
  Ta  Ta11  1  0.421  0.289  0.000  1.0
  Ag  Ag12  1  0.672  0.172  0.500  1.0
  Ag  Ag13  1  0.328  0.828  0.500  1.0
  Ag  Ag14  1  0.172  0.328  0.500  1.0
  Ag  Ag15  1  0.828  0.672  0.500  1.0
  O  O16  1  0.188  0.080  0.500  1.0
  O  O17  1  0.812  0.920  0.500  1.0
  O  O18  1  0.080  0.812  0.500  1.0
  O  O19  1  0.688  0.420  0.500  1.0
  O  O20  1  0.920  0.188  0.500  1.0
  O  O21  1  0.312  0.580  0.500  1.0
  O  O22  1  0.580  0.688  0.500  1.0
  O  O23  1  0.420  0.312  0.500  1.0
  O  O24  1  0.225  0.725  0.000  1.0
  O  O25  1  0.775  0.275  0.000  1.0
  O  O26  1  0.725  0.775  0.000  1.0
  O  O27  1  0.275  0.225  0.000  1.0
  O  O28  1  0.500  0.000  0.500  1.0
  O  O29  1  0.000  0.500  0.500  1.0
  O  O30  1  0.057  0.130  0.000  1.0
  O  O31  1  0.943  0.870  0.000  1.0
  O  O32  1  0.130  0.943  0.000  1.0
  O  O33  1  0.557  0.370  0.000  1.0
  O  O34  1  0.870  0.057  0.000  1.0
  O  O35  1  0.443  0.630  0.000  1.0
  O  O36  1  0.630  0.557  0.000  1.0
  O  O37  1  0.370  0.443  0.000  1.0
  O  O38  1  0.341  0.999  0.000  1.0
  O  O39  1  0.659  0.001  0.000  1.0
  O  O40  1  0.999  0.659  0.000  1.0
  O  O41  1  0.841  0.501  0.000  1.0
  O  O42  1  0.001  0.341  0.000  1.0
  O  O43  1  0.159  0.499  0.000  1.0
  O  O44  1  0.499  0.841  0.000  1.0
  O  O45  1  0.501  0.159  0.000  1.0
[/CIF]
.
The material structure described by ErTa5Ag2O15 crystallizes in the tetragonal P4/mbm space group. Er(1) is bonded to four equivalent O(1) and eight equivalent O(4) atoms to form ErO12 cuboctahedra that share faces with two equivalent Er(1)O12 cuboctahedra and faces with eight equivalent Ta(2)O6 octahedra. There are two inequivalent Ta sites. In the first Ta site, Ta(1) is bonded to two equivalent O(3) and four equivalent O(5) atoms to form corner-sharing TaO6 octahedra. The corner-sharing octahedral tilt angles range from 0-32°. In the second Ta site, Ta(2) is bonded to one O(2), one O(5), two equivalent O(1), and two equivalent O(4) atoms to form TaO6 octahedra that share  a cornercorner with one Ta(1)O6 octahedra, corners with five equivalent Ta(2)O6 octahedra, and faces with two equivalent Er(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 13-42°. Ag(1) is bonded in an L-shaped geometry to two equivalent O(2) atoms. There are five inequivalent O sites. In the first O site, O(5) is bonded in a bent 150 degrees geometry to one Ta(1) and one Ta(2) atom. In the second O site, O(1) is bonded in a distorted T-shaped geometry to one Er(1) and two equivalent Ta(2) atoms. In the third O site, O(2) is bonded in a 4-coordinate geometry to two equivalent Ta(2) and two equivalent Ag(1) atoms. In the fourth O site, O(3) is bonded in a linear geometry to two equivalent Ta(1) atoms. In the fifth O site, O(4) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Er(1) and two equivalent Ta(2) atoms. is represented by the CIF card [CIF]
data_ErTa5Ag2O15
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   12.593
_cell_length_b   12.593
_cell_length_c   3.916
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   621.094
_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
  Er  Er0  1  0.000  0.000  0.500  1.0
  Er  Er1  1  0.500  0.500  0.500  1.0
  Ta  Ta2  1  0.500  0.000  0.000  1.0
  Ta  Ta3  1  0.000  0.500  0.000  1.0
  Ta  Ta4  1  0.211  0.079  0.000  1.0
  Ta  Ta5  1  0.789  0.921  0.000  1.0
  Ta  Ta6  1  0.079  0.789  0.000  1.0
  Ta  Ta7  1  0.711  0.421  0.000  1.0
  Ta  Ta8  1  0.921  0.211  0.000  1.0
  Ta  Ta9  1  0.289  0.579  0.000  1.0
  Ta  Ta10  1  0.579  0.711  0.000  1.0
  Ta  Ta11  1  0.421  0.289  0.000  1.0
  Ag  Ag12  1  0.672  0.172  0.500  1.0
  Ag  Ag13  1  0.328  0.828  0.500  1.0
  Ag  Ag14  1  0.172  0.328  0.500  1.0
  Ag  Ag15  1  0.828  0.672  0.500  1.0
  O  O16  1  0.188  0.080  0.500  1.0
  O  O17  1  0.812  0.920  0.500  1.0
  O  O18  1  0.080  0.812  0.500  1.0
  O  O19  1  0.688  0.420  0.500  1.0
  O  O20  1  0.920  0.188  0.500  1.0
  O  O21  1  0.312  0.580  0.500  1.0
  O  O22  1  0.580  0.688  0.500  1.0
  O  O23  1  0.420  0.312  0.500  1.0
  O  O24  1  0.225  0.725  0.000  1.0
  O  O25  1  0.775  0.275  0.000  1.0
  O  O26  1  0.725  0.775  0.000  1.0
  O  O27  1  0.275  0.225  0.000  1.0
  O  O28  1  0.500  0.000  0.500  1.0
  O  O29  1  0.000  0.500  0.500  1.0
  O  O30  1  0.057  0.130  0.000  1.0
  O  O31  1  0.943  0.870  0.000  1.0
  O  O32  1  0.130  0.943  0.000  1.0
  O  O33  1  0.557  0.370  0.000  1.0
  O  O34  1  0.870  0.057  0.000  1.0
  O  O35  1  0.443  0.630  0.000  1.0
  O  O36  1  0.630  0.557  0.000  1.0
  O  O37  1  0.370  0.443  0.000  1.0
  O  O38  1  0.341  0.999  0.000  1.0
  O  O39  1  0.659  0.001  0.000  1.0
  O  O40  1  0.999  0.659  0.000  1.0
  O  O41  1  0.841  0.501  0.000  1.0
  O  O42  1  0.001  0.341  0.000  1.0
  O  O43  1  0.159  0.499  0.000  1.0
  O  O44  1  0.499  0.841  0.000  1.0
  O  O45  1  0.501  0.159  0.000  1.0
[/CIF]
.