The material structure described by LiEr6Ta2O14 crystallizes in the monoclinic Cm space group. Li(1) is bonded in a distorted trigonal planar geometry to one O(7) and two equivalent O(2) atoms. There are four inequivalent Er sites. In the first Er site, Er(1) is bonded in a 6-coordinate geometry to one O(3), one O(4), one O(5), one O(6), and two equivalent O(2) atoms. In the second Er site, Er(2) is bonded in a 6-coordinate geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(5) atoms. In the third Er site, Er(3) is bonded in a 6-coordinate geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(6) atoms. In the fourth Er site, Er(4) is bonded in a 7-coordinate geometry to one O(3), one O(4), one O(5), one O(6), one O(8), and two equivalent O(1) atoms. There are two inequivalent Ta sites. In the first Ta site, Ta(1) is bonded to one O(7), one O(8), two equivalent O(4), and two equivalent O(5) atoms to form corner-sharing TaO6 octahedra. The corner-sharing octahedral tilt angles range from 30-68°. In the second Ta site, Ta(2) is bonded to one O(7), one O(8), two equivalent O(3), and two equivalent O(6) atoms to form corner-sharing TaO6 octahedra. The corner-sharing octahedral tilt angles range from 30-68°. There are eight inequivalent O sites. In the first O site, O(1) is bonded to one Er(2), one Er(3), and two equivalent Er(4) atoms to form OEr4 tetrahedra that share corners with two equivalent O(1)Er4 tetrahedra, corners with two equivalent O(5)Er3Ta trigonal pyramids, corners with two equivalent O(6)Er3Ta trigonal pyramids,  an edgeedge with one O(1)Er4 tetrahedra,  an edgeedge with one O(5)Er3Ta trigonal pyramid, and  an edgeedge with one O(6)Er3Ta trigonal pyramid. In the second O site, O(2) is bonded in a 5-coordinate geometry to one Li(1), one Er(2), one Er(3), and two equivalent Er(1) atoms. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Er(1), one Er(4), and one Ta(2) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Er(1), one Er(4), and one Ta(1) atom. In the fifth O site, O(5) is bonded to one Er(1), one Er(2), one Er(4), and one Ta(1) atom to form distorted OEr3Ta trigonal pyramids that share corners with two equivalent O(1)Er4 tetrahedra, corners with two equivalent O(6)Er3Ta trigonal pyramids,  an edgeedge with one O(1)Er4 tetrahedra, and  an edgeedge with one O(5)Er3Ta trigonal pyramid. In the sixth O site, O(6) is bonded to one Er(1), one Er(3), one Er(4), and one Ta(2) atom to form distorted OEr3Ta trigonal pyramids that share corners with two equivalent O(1)Er4 tetrahedra, corners with two equivalent O(5)Er3Ta trigonal pyramids,  an edgeedge with one O(1)Er4 tetrahedra, and  an edgeedge with one O(6)Er3Ta trigonal pyramid. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Li(1), one Ta(1), and one Ta(2) atom. In the eighth O site, O(8) is bonded in a distorted water-like geometry to two equivalent Er(4), one Ta(1), and one Ta(2) atom. is represented by the CIF card [CIF]
data_LiEr6Ta2O14
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.620
_cell_length_b   6.620
_cell_length_c   7.228
_cell_angle_alpha   89.838
_cell_angle_beta   89.838
_cell_angle_gamma   109.618
_symmetry_Int_Tables_number   1
_cell_volume   298.418
_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
  Li  Li0  1  0.185  0.185  0.220  1.0
  Er  Er1  1  0.052  0.534  0.249  1.0
  Er  Er2  1  0.918  0.918  0.980  1.0
  Er  Er3  1  0.926  0.926  0.505  1.0
  Er  Er4  1  0.472  0.951  0.747  1.0
  Er  Er5  1  0.534  0.052  0.249  1.0
  Er  Er6  1  0.951  0.472  0.747  1.0
  Ta  Ta7  1  0.491  0.491  0.978  1.0
  Ta  Ta8  1  0.492  0.492  0.517  1.0
  O  O9  1  0.108  0.841  0.746  1.0
  O  O10  1  0.155  0.897  0.246  1.0
  O  O11  1  0.195  0.478  0.536  1.0
  O  O12  1  0.190  0.469  0.963  1.0
  O  O13  1  0.564  0.822  0.035  1.0
  O  O14  1  0.569  0.825  0.460  1.0
  O  O15  1  0.422  0.422  0.249  1.0
  O  O16  1  0.641  0.641  0.748  1.0
  O  O17  1  0.469  0.190  0.963  1.0
  O  O18  1  0.478  0.195  0.536  1.0
  O  O19  1  0.822  0.564  0.035  1.0
  O  O20  1  0.825  0.569  0.460  1.0
  O  O21  1  0.841  0.108  0.746  1.0
  O  O22  1  0.897  0.155  0.246  1.0
[/CIF]
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The material structure described by LiEr6Ta2O14 crystallizes in the monoclinic Cm space group. Li(1) is bonded in a distorted trigonal planar geometry to one O(7) and two equivalent O(2) atoms. There are four inequivalent Er sites. In the first Er site, Er(1) is bonded in a 6-coordinate geometry to one O(3), one O(4), one O(5), one O(6), and two equivalent O(2) atoms. In the second Er site, Er(2) is bonded in a 6-coordinate geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(5) atoms. In the third Er site, Er(3) is bonded in a 6-coordinate geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(6) atoms. In the fourth Er site, Er(4) is bonded in a 7-coordinate geometry to one O(3), one O(4), one O(5), one O(6), one O(8), and two equivalent O(1) atoms. There are two inequivalent Ta sites. In the first Ta site, Ta(1) is bonded to one O(7), one O(8), two equivalent O(4), and two equivalent O(5) atoms to form corner-sharing TaO6 octahedra. The corner-sharing octahedral tilt angles range from 30-68°. In the second Ta site, Ta(2) is bonded to one O(7), one O(8), two equivalent O(3), and two equivalent O(6) atoms to form corner-sharing TaO6 octahedra. The corner-sharing octahedral tilt angles range from 30-68°. There are eight inequivalent O sites. In the first O site, O(1) is bonded to one Er(2), one Er(3), and two equivalent Er(4) atoms to form OEr4 tetrahedra that share corners with two equivalent O(1)Er4 tetrahedra, corners with two equivalent O(5)Er3Ta trigonal pyramids, corners with two equivalent O(6)Er3Ta trigonal pyramids,  an edgeedge with one O(1)Er4 tetrahedra,  an edgeedge with one O(5)Er3Ta trigonal pyramid, and  an edgeedge with one O(6)Er3Ta trigonal pyramid. In the second O site, O(2) is bonded in a 5-coordinate geometry to one Li(1), one Er(2), one Er(3), and two equivalent Er(1) atoms. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Er(1), one Er(4), and one Ta(2) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Er(1), one Er(4), and one Ta(1) atom. In the fifth O site, O(5) is bonded to one Er(1), one Er(2), one Er(4), and one Ta(1) atom to form distorted OEr3Ta trigonal pyramids that share corners with two equivalent O(1)Er4 tetrahedra, corners with two equivalent O(6)Er3Ta trigonal pyramids,  an edgeedge with one O(1)Er4 tetrahedra, and  an edgeedge with one O(5)Er3Ta trigonal pyramid. In the sixth O site, O(6) is bonded to one Er(1), one Er(3), one Er(4), and one Ta(2) atom to form distorted OEr3Ta trigonal pyramids that share corners with two equivalent O(1)Er4 tetrahedra, corners with two equivalent O(5)Er3Ta trigonal pyramids,  an edgeedge with one O(1)Er4 tetrahedra, and  an edgeedge with one O(6)Er3Ta trigonal pyramid. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Li(1), one Ta(1), and one Ta(2) atom. In the eighth O site, O(8) is bonded in a distorted water-like geometry to two equivalent Er(4), one Ta(1), and one Ta(2) atom. is represented by the CIF card [CIF]
data_LiEr6Ta2O14
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.620
_cell_length_b   6.620
_cell_length_c   7.228
_cell_angle_alpha   89.838
_cell_angle_beta   89.838
_cell_angle_gamma   109.618
_symmetry_Int_Tables_number   1
_cell_volume   298.418
_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
  Li  Li0  1  0.185  0.185  0.220  1.0
  Er  Er1  1  0.052  0.534  0.249  1.0
  Er  Er2  1  0.918  0.918  0.980  1.0
  Er  Er3  1  0.926  0.926  0.505  1.0
  Er  Er4  1  0.472  0.951  0.747  1.0
  Er  Er5  1  0.534  0.052  0.249  1.0
  Er  Er6  1  0.951  0.472  0.747  1.0
  Ta  Ta7  1  0.491  0.491  0.978  1.0
  Ta  Ta8  1  0.492  0.492  0.517  1.0
  O  O9  1  0.108  0.841  0.746  1.0
  O  O10  1  0.155  0.897  0.246  1.0
  O  O11  1  0.195  0.478  0.536  1.0
  O  O12  1  0.190  0.469  0.963  1.0
  O  O13  1  0.564  0.822  0.035  1.0
  O  O14  1  0.569  0.825  0.460  1.0
  O  O15  1  0.422  0.422  0.249  1.0
  O  O16  1  0.641  0.641  0.748  1.0
  O  O17  1  0.469  0.190  0.963  1.0
  O  O18  1  0.478  0.195  0.536  1.0
  O  O19  1  0.822  0.564  0.035  1.0
  O  O20  1  0.825  0.569  0.460  1.0
  O  O21  1  0.841  0.108  0.746  1.0
  O  O22  1  0.897  0.155  0.246  1.0
[/CIF]
.