data_Eu5Ta4O15
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.58
_cell_length_b   5.58
_cell_length_c   11.29
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Eu5Ta4O15
_chemical_formula_sum   'Eu5 Ta4 O15'
_cell_volume   304.22
_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
  Eu  Eu0  1  0.0  0.0  0.0  1.0
  Eu  Eu1  1  0.79  0.61  0.61  1.0
  Eu  Eu2  1  0.0  0.22  0.98  1.0
  Eu  Eu3  1  0.79  0.61  0.31  1.0
  Eu  Eu4  1  0.0  0.22  0.68  1.0
  Ta  Ta20  1  0.0  0.22  0.2  1.0
  Ta  Ta21  1  0.0  0.0  0.65  1.0
  Ta  Ta22  1  0.0  0.0  0.64  1.0
  Ta  Ta23  1  0.79  0.61  0.09  1.0
  O  O5  1  0.79  0.0  0.0  1.0
  O  O6  1  0.61  0.42  0.0  1.0
  O  O7  1  0.39  0.42  0.0  1.0
  O  O8  1  0.0  0.57  0.22  1.0
  O  O9  1  0.57  0.05  0.22  1.0
  O  O10  1  0.43  0.05  0.22  1.0
  O  O11  1  0.46  0.84  0.48  1.0
  O  O12  1  0.12  0.84  0.48  1.0
  O  O13  1  0.79  0.15  0.48  1.0
  O  O14  1  0.0  0.68  0.81  1.0
  O  O15  1  0.67  0.99  0.81  1.0
  O  O16  1  0.33  0.99  0.81  1.0
  O  O17  1  0.36  0.79  0.07  1.0
  O  O18  1  0.22  0.79  0.07  1.0
  O  O19  1  0.79  0.26  0.07  1.0

data_Eu5Ta4O15
_symmetry_space_group_name_H-M   P1
_cell_length_a   5.58
_cell_length_b   5.58
_cell_length_c   11.29
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Eu5Ta4O15
_chemical_formula_sum   'Eu5 Ta4 O15'
_cell_volume   304.22
_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
  Eu  Eu0  1  0.0  0.0  0.0  1.0
  Eu  Eu1  1  0.0  0.22  0.68  1.0
  Eu  Eu2  1  0.0  0.22  0.98  1.0
  Eu  Eu3  1  0.79  0.61  0.31  1.0
  Eu  Eu4  1  0.79  0.61  0.61  1.0
  Ta  Ta5  1  0.0  0.0  0.64  1.0
  Ta  Ta6  1  0.0  0.0  0.65  1.0
  Ta  Ta7  1  0.0  0.22  0.2  1.0
  Ta  Ta8  1  0.79  0.61  0.09  1.0
  O  O9  1  0.0  0.57  0.22  1.0
  O  O10  1  0.0  0.68  0.81  1.0
  O  O11  1  0.12  0.84  0.48  1.0
  O  O12  1  0.22  0.79  0.07  1.0
  O  O13  1  0.33  0.99  0.81  1.0
  O  O14  1  0.36  0.79  0.07  1.0
  O  O15  1  0.39  0.42  0.0  1.0
  O  O16  1  0.43  0.05  0.22  1.0
  O  O17  1  0.46  0.84  0.48  1.0
  O  O18  1  0.57  0.05  0.22  1.0
  O  O19  1  0.61  0.42  0.0  1.0
  O  O20  1  0.67  0.99  0.81  1.0
  O  O21  1  0.79  0.0  0.0  1.0
  O  O22  1  0.79  0.15  0.48  1.0
  O  O23  1  0.79  0.26  0.07  1.0

Eu Eu Eu Eu Eu Ta Ta Ta Ta O O O O O O O O O O O O O O O
Eu Eu Eu Eu Eu Ta Ta Ta Ta O O O O O O O O O O O O O O O 0 2 o o - 0 9 - o o 1 16 + o o 1 7 + + o 1 6 + + o 2 9 - o + 2 23 - o + 3 12 + o o 4 7 o o o 4 6 o o o 4 19 - - o 5 13 - o o 5 23 - o o 5 12 o o o 6 7 o o o 6 16 o - o 7 16 o - o 8 10 o o o 8 12 + o o 8 23 o o o 9 19 o - - 9 23 o o o 10 11 o o o 10 23 o o o 12 22 o o o 13 14 o o o 13 23 o o o 15 16 o o o 15 17 o + o 18 20 o o o 19 20 o o o 21 22 o o o 
Eu5Ta4O15 crystallizes in the triclinic P1 space group. There are five inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a distorted single-bond geometry to one O(1), one O(10), one O(12), one O(14), and one O(3) atom. The Eu(1)-O(1) bond length is 1.18 Å. The Eu(1)-O(10) bond length is 2.76 Å. The Eu(1)-O(12) bond length is 2.83 Å. The Eu(1)-O(14) bond length is 2.24 Å. The Eu(1)-O(3) bond length is 2.26 Å. In the second Eu site, Eu(2) is bonded in a 1-coordinate geometry to one O(10), one O(7), one O(8), and one O(9) atom. The Eu(2)-O(10) bond length is 2.57 Å. The Eu(2)-O(7) bond length is 3.10 Å. The Eu(2)-O(8) bond length is 2.20 Å. The Eu(2)-O(9) bond length is 2.95 Å. In the third Eu site, Eu(3) is bonded in a 1-coordinate geometry to one O(1), one O(10), one O(15), and one O(3) atom. The Eu(3)-O(1) bond length is 1.24 Å. The Eu(3)-O(10) bond length is 3.15 Å. The Eu(3)-O(15) bond length is 1.69 Å. The Eu(3)-O(3) bond length is 1.93 Å. In the fourth Eu site, Eu(4) is bonded in a 1-coordinate geometry to one O(4), one O(7), one O(8), and one O(9) atom. The Eu(4)-O(4) bond length is 1.69 Å. The Eu(4)-O(7) bond length is 3.29 Å. The Eu(4)-O(8) bond length is 2.46 Å. The Eu(4)-O(9) bond length is 3.15 Å. In the fifth Eu site, Eu(5) is bonded in a 2-coordinate geometry to one Ta(2), one O(10), one O(11), and one O(9) atom. The Eu(5)-Ta(2) bond length is 1.29 Å. The Eu(5)-O(10) bond length is 2.95 Å. The Eu(5)-O(11) bond length is 2.20 Å. The Eu(5)-O(9) bond length is 2.57 Å. There are four inequivalent Ta sites. In the first Ta site, Ta(1) is bonded in a 3-coordinate geometry to one O(15), one O(4), and one O(5) atom. The Ta(1)-O(15) bond length is 1.95 Å. The Ta(1)-O(4) bond length is 1.96 Å. The Ta(1)-O(5) bond length is 2.09 Å. In the second Ta site, Ta(2) is bonded in a 1-coordinate geometry to one Eu(5), one Ta(3), one O(10), and one O(12) atom. The Ta(2)-Ta(3) bond length is 0.11 Å. The Ta(2)-O(10) bond length is 2.57 Å. The Ta(2)-O(12) bond length is 2.64 Å. In the third Ta site, Ta(3) is bonded in a distorted single-bond geometry to one Ta(2), one O(8), and one O(9) atom. The Ta(3)-O(8) bond length is 2.30 Å. The Ta(3)-O(9) bond length is 2.55 Å. In the fourth Ta site, Ta(4) is bonded in a 1-coordinate geometry to one O(14), one O(15), one O(2), and one O(4) atom. The Ta(4)-O(14) bond length is 2.09 Å. The Ta(4)-O(15) bond length is 1.96 Å. The Ta(4)-O(2) bond length is 1.46 Å. The Ta(4)-O(4) bond length is 1.95 Å. There are fifteen inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to one Eu(1) and one Eu(3) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Ta(4) and one O(3) atom. The O(2)-O(3) bond length is 1.18 Å. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Eu(1), one Eu(3), and one O(2) atom. In the fourth O site, O(4) is bonded in a distorted trigonal non-coplanar geometry to one Eu(4), one Ta(1), and one Ta(4) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one Ta(1) and one O(6) atom. The O(5)-O(6) bond length is 0.79 Å. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one O(5) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Eu(2), one Eu(4), one O(8), and one O(9) atom. The O(7)-O(8) bond length is 1.86 Å. The O(7)-O(9) bond length is 1.80 Å. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Eu(2), one Eu(4), one Ta(3), and one O(7) atom. In the ninth O site, O(9) is bonded in a 5-coordinate geometry to one Eu(2), one Eu(4), one Eu(5), one Ta(3), and one O(7) atom. In the tenth O site, O(10) is bonded in a 6-coordinate geometry to one Eu(1), one Eu(2), one Eu(3), one Eu(5), one Ta(2), and one O(12) atom. The O(10)-O(12) bond length is 1.80 Å. In the eleventh O site, O(11) is bonded in a distorted single-bond geometry to one Eu(5) and one O(12) atom. The O(11)-O(12) bond length is 1.86 Å. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to one Eu(1), one Ta(2), one O(10), and one O(11) atom. In the thirteenth O site, O(13) is bonded in a single-bond geometry to one O(14) atom. The O(13)-O(14) bond length is 0.79 Å. In the fourteenth O site, O(14) is bonded in a 3-coordinate geometry to one Eu(1), one Ta(4), and one O(13) atom. In the fifteenth O site, O(15) is bonded in a 3-coordinate geometry to one Eu(3), one Ta(1), and one Ta(4) atom.