The compound described by Li2CoSiO4 is beta beryllia-derived structured and crystallizes in the monoclinic C2/m space group. There are two inequivalent Li sites. In the first Li site, Li(1) is bonded to two equivalent O(2) and two equivalent O(3) atoms to form LiO4 tetrahedra that share corners with two equivalent Co(1)O4 tetrahedra, corners with four equivalent Li(2)O4 tetrahedra, corners with four equivalent Si(1)O4 tetrahedra, and  an edgeedge with one Li(1)O4 tetrahedra. In the second Li site, Li(2) is bonded to one O(1), one O(2), and two equivalent O(3) atoms to form distorted LiO4 tetrahedra that share corners with two equivalent Si(1)O4 tetrahedra, corners with four equivalent Li(1)O4 tetrahedra, corners with four equivalent Co(1)O4 tetrahedra, and  an edgeedge with one Si(1)O4 tetrahedra. Co(1) is bonded to two equivalent O(1) and two equivalent O(3) atoms to form CoO4 tetrahedra that share corners with two equivalent Li(1)O4 tetrahedra, corners with four equivalent Li(2)O4 tetrahedra, corners with four equivalent Si(1)O4 tetrahedra, and  an edgeedge with one Co(1)O4 tetrahedra. Si(1) is bonded to one O(1), one O(2), and two equivalent O(3) atoms to form SiO4 tetrahedra that share corners with two equivalent Li(2)O4 tetrahedra, corners with four equivalent Li(1)O4 tetrahedra, corners with four equivalent Co(1)O4 tetrahedra, and  an edgeedge with one Li(2)O4 tetrahedra. There are three inequivalent O sites. In the first O site, O(1) is bonded to one Li(2), two equivalent Co(1), and one Si(1) atom to form distorted OLiCo2Si tetrahedra that share corners with two equivalent O(2)Li3Si tetrahedra, corners with eight equivalent O(3)Li2CoSi tetrahedra, and  an edgeedge with one O(1)LiCo2Si tetrahedra. In the second O site, O(2) is bonded to one Li(2), two equivalent Li(1), and one Si(1) atom to form OLi3Si tetrahedra that share corners with two equivalent O(1)LiCo2Si tetrahedra, corners with eight equivalent O(3)Li2CoSi tetrahedra, and  an edgeedge with one O(2)Li3Si tetrahedra. In the third O site, O(3) is bonded to one Li(1), one Li(2), one Co(1), and one Si(1) atom to form OLi2CoSi tetrahedra that share corners with two equivalent O(3)Li2CoSi tetrahedra, corners with four equivalent O(2)Li3Si tetrahedra, corners with four equivalent O(1)LiCo2Si tetrahedra, and  an edgeedge with one O(3)Li2CoSi tetrahedra. is represented by the CIF file [CIF]
data_Li2CoSiO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.315
_cell_length_b   5.315
_cell_length_c   6.308
_cell_angle_alpha   90.522
_cell_angle_beta   90.519
_cell_angle_gamma   92.272
_symmetry_Int_Tables_number   1
_cell_volume   178.029
_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
  Co  Co0  1  0.188  0.812  1.000  1.0
  Co  Co1  1  0.812  0.188  0.000  1.0
  Li  Li2  1  0.823  0.177  0.500  1.0
  Li  Li3  1  0.176  0.824  0.500  1.0
  Li  Li4  1  0.318  0.319  0.737  1.0
  Li  Li5  1  0.681  0.682  0.263  1.0
  O  O6  1  0.195  0.195  0.033  1.0
  O  O7  1  0.805  0.805  0.967  1.0
  O  O8  1  0.195  0.195  0.464  1.0
  O  O9  1  0.805  0.805  0.536  1.0
  O  O10  1  0.631  0.291  0.250  1.0
  O  O11  1  0.709  0.369  0.750  1.0
  O  O12  1  0.291  0.631  0.250  1.0
  O  O13  1  0.368  0.709  0.750  1.0
  Si  Si14  1  0.322  0.322  0.257  1.0
  Si  Si15  1  0.678  0.678  0.743  1.0
[/CIF]
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The compound described by Li2CoSiO4 is beta beryllia-derived structured and crystallizes in the monoclinic C2/m space group. There are two inequivalent Li sites. In the first Li site, Li(1) is bonded to two equivalent O(2) and two equivalent O(3) atoms to form LiO4 tetrahedra that share corners with two equivalent Co(1)O4 tetrahedra, corners with four equivalent Li(2)O4 tetrahedra, corners with four equivalent Si(1)O4 tetrahedra, and  an edgeedge with one Li(1)O4 tetrahedra. In the second Li site, Li(2) is bonded to one O(1), one O(2), and two equivalent O(3) atoms to form distorted LiO4 tetrahedra that share corners with two equivalent Si(1)O4 tetrahedra, corners with four equivalent Li(1)O4 tetrahedra, corners with four equivalent Co(1)O4 tetrahedra, and  an edgeedge with one Si(1)O4 tetrahedra. Co(1) is bonded to two equivalent O(1) and two equivalent O(3) atoms to form CoO4 tetrahedra that share corners with two equivalent Li(1)O4 tetrahedra, corners with four equivalent Li(2)O4 tetrahedra, corners with four equivalent Si(1)O4 tetrahedra, and  an edgeedge with one Co(1)O4 tetrahedra. Si(1) is bonded to one O(1), one O(2), and two equivalent O(3) atoms to form SiO4 tetrahedra that share corners with two equivalent Li(2)O4 tetrahedra, corners with four equivalent Li(1)O4 tetrahedra, corners with four equivalent Co(1)O4 tetrahedra, and  an edgeedge with one Li(2)O4 tetrahedra. There are three inequivalent O sites. In the first O site, O(1) is bonded to one Li(2), two equivalent Co(1), and one Si(1) atom to form distorted OLiCo2Si tetrahedra that share corners with two equivalent O(2)Li3Si tetrahedra, corners with eight equivalent O(3)Li2CoSi tetrahedra, and  an edgeedge with one O(1)LiCo2Si tetrahedra. In the second O site, O(2) is bonded to one Li(2), two equivalent Li(1), and one Si(1) atom to form OLi3Si tetrahedra that share corners with two equivalent O(1)LiCo2Si tetrahedra, corners with eight equivalent O(3)Li2CoSi tetrahedra, and  an edgeedge with one O(2)Li3Si tetrahedra. In the third O site, O(3) is bonded to one Li(1), one Li(2), one Co(1), and one Si(1) atom to form OLi2CoSi tetrahedra that share corners with two equivalent O(3)Li2CoSi tetrahedra, corners with four equivalent O(2)Li3Si tetrahedra, corners with four equivalent O(1)LiCo2Si tetrahedra, and  an edgeedge with one O(3)Li2CoSi tetrahedra. is represented by the CIF file [CIF]
data_Li2CoSiO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.315
_cell_length_b   5.315
_cell_length_c   6.308
_cell_angle_alpha   90.522
_cell_angle_beta   90.519
_cell_angle_gamma   92.272
_symmetry_Int_Tables_number   1
_cell_volume   178.029
_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
  Co  Co0  1  0.188  0.812  1.000  1.0
  Co  Co1  1  0.812  0.188  0.000  1.0
  Li  Li2  1  0.823  0.177  0.500  1.0
  Li  Li3  1  0.176  0.824  0.500  1.0
  Li  Li4  1  0.318  0.319  0.737  1.0
  Li  Li5  1  0.681  0.682  0.263  1.0
  O  O6  1  0.195  0.195  0.033  1.0
  O  O7  1  0.805  0.805  0.967  1.0
  O  O8  1  0.195  0.195  0.464  1.0
  O  O9  1  0.805  0.805  0.536  1.0
  O  O10  1  0.631  0.291  0.250  1.0
  O  O11  1  0.709  0.369  0.750  1.0
  O  O12  1  0.291  0.631  0.250  1.0
  O  O13  1  0.368  0.709  0.750  1.0
  Si  Si14  1  0.322  0.322  0.257  1.0
  Si  Si15  1  0.678  0.678  0.743  1.0
[/CIF]
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