Li2Co(SiO3)2 crystallizes in the monoclinic P2_1 space group. There are two inequivalent Li sites. In the first Li site, Li(1) is bonded to one O(2), one O(4), one O(5), and one O(6) atom to form LiO4 tetrahedra that share corners with two equivalent Si(1)O4 tetrahedra, corners with three equivalent Si(2)O4 tetrahedra, corners with four equivalent Li(2)O4 tetrahedra, and corners with two equivalent Co(1)O4 trigonal pyramids. In the second Li site, Li(2) is bonded to one O(4), one O(5), and two equivalent O(6) atoms to form LiO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra, corners with two equivalent Li(2)O4 tetrahedra, corners with four equivalent Li(1)O4 tetrahedra, corners with four equivalent Si(2)O4 tetrahedra, and  a cornercorner with one Co(1)O4 trigonal pyramid. Co(1) is bonded to one O(1), one O(2), one O(3), and one O(5) atom to form distorted CoO4 trigonal pyramids that share  a cornercorner with one Li(2)O4 tetrahedra, corners with two equivalent Li(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, and corners with three equivalent Si(1)O4 tetrahedra. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form SiO4 tetrahedra that share  a cornercorner with one Li(2)O4 tetrahedra, corners with two equivalent Li(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, and corners with three equivalent Co(1)O4 trigonal pyramids. In the second Si site, Si(2) is bonded to one O(3), one O(4), one O(5), and one O(6) atom to form SiO4 tetrahedra that share corners with two equivalent Si(1)O4 tetrahedra, corners with three equivalent Li(1)O4 tetrahedra, corners with four equivalent Li(2)O4 tetrahedra, and corners with two equivalent Co(1)O4 trigonal pyramids. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Co(1) and one Si(1) atom. In the second O site, O(2) is bonded in a trigonal non-coplanar geometry to one Li(1), one Co(1), and one Si(1) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Co(1), one Si(1), and one Si(2) atom. In the fourth O site, O(4) is bonded to one Li(1), one Li(2), one Si(1), and one Si(2) atom to form OLi2Si2 tetrahedra that share corners with three equivalent O(5)Li2CoSi tetrahedra and corners with four equivalent O(6)Li3Si tetrahedra. In the fifth O site, O(5) is bonded to one Li(1), one Li(2), one Co(1), and one Si(2) atom to form distorted OLi2CoSi tetrahedra that share corners with three equivalent O(4)Li2Si2 tetrahedra and corners with four equivalent O(6)Li3Si tetrahedra. In the sixth O site, O(6) is bonded to one Li(1), two equivalent Li(2), and one Si(2) atom to form distorted OLi3Si tetrahedra that share corners with two equivalent O(6)Li3Si tetrahedra, corners with four equivalent O(5)Li2CoSi tetrahedra, and corners with four equivalent O(4)Li2Si2 tetrahedra.
Li2Co(SiO3)2 crystallizes in the monoclinic P2_1 space group. There are two inequivalent Li sites. In the first Li site, Li(1) is bonded to one O(2), one O(4), one O(5), and one O(6) atom to form LiO4 tetrahedra that share corners with two equivalent Si(1)O4 tetrahedra, corners with three equivalent Si(2)O4 tetrahedra, corners with four equivalent Li(2)O4 tetrahedra, and corners with two equivalent Co(1)O4 trigonal pyramids. The Li(1)-O(2) bond length is 1.89 Å. The Li(1)-O(4) bond length is 2.12 Å. The Li(1)-O(5) bond length is 1.98 Å. The Li(1)-O(6) bond length is 1.94 Å. In the second Li site, Li(2) is bonded to one O(4), one O(5), and two equivalent O(6) atoms to form LiO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra, corners with two equivalent Li(2)O4 tetrahedra, corners with four equivalent Li(1)O4 tetrahedra, corners with four equivalent Si(2)O4 tetrahedra, and  a cornercorner with one Co(1)O4 trigonal pyramid. The Li(2)-O(4) bond length is 2.19 Å. The Li(2)-O(5) bond length is 2.08 Å. Both Li(2)-O(6) bond lengths are 2.02 Å. Co(1) is bonded to one O(1), one O(2), one O(3), and one O(5) atom to form distorted CoO4 trigonal pyramids that share  a cornercorner with one Li(2)O4 tetrahedra, corners with two equivalent Li(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, and corners with three equivalent Si(1)O4 tetrahedra. The Co(1)-O(1) bond length is 1.89 Å. The Co(1)-O(2) bond length is 1.97 Å. The Co(1)-O(3) bond length is 2.20 Å. The Co(1)-O(5) bond length is 2.05 Å. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form SiO4 tetrahedra that share  a cornercorner with one Li(2)O4 tetrahedra, corners with two equivalent Li(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, and corners with three equivalent Co(1)O4 trigonal pyramids. The Si(1)-O(1) bond length is 1.58 Å. The Si(1)-O(2) bond length is 1.62 Å. The Si(1)-O(3) bond length is 1.70 Å. The Si(1)-O(4) bond length is 1.72 Å. In the second Si site, Si(2) is bonded to one O(3), one O(4), one O(5), and one O(6) atom to form SiO4 tetrahedra that share corners with two equivalent Si(1)O4 tetrahedra, corners with three equivalent Li(1)O4 tetrahedra, corners with four equivalent Li(2)O4 tetrahedra, and corners with two equivalent Co(1)O4 trigonal pyramids. The Si(2)-O(3) bond length is 1.68 Å. The Si(2)-O(4) bond length is 1.69 Å. The Si(2)-O(5) bond length is 1.63 Å. The Si(2)-O(6) bond length is 1.61 Å. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Co(1) and one Si(1) atom. In the second O site, O(2) is bonded in a trigonal non-coplanar geometry to one Li(1), one Co(1), and one Si(1) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Co(1), one Si(1), and one Si(2) atom. In the fourth O site, O(4) is bonded to one Li(1), one Li(2), one Si(1), and one Si(2) atom to form OLi2Si2 tetrahedra that share corners with three equivalent O(5)Li2CoSi tetrahedra and corners with four equivalent O(6)Li3Si tetrahedra. In the fifth O site, O(5) is bonded to one Li(1), one Li(2), one Co(1), and one Si(2) atom to form distorted OLi2CoSi tetrahedra that share corners with three equivalent O(4)Li2Si2 tetrahedra and corners with four equivalent O(6)Li3Si tetrahedra. In the sixth O site, O(6) is bonded to one Li(1), two equivalent Li(2), and one Si(2) atom to form distorted OLi3Si tetrahedra that share corners with two equivalent O(6)Li3Si tetrahedra, corners with four equivalent O(5)Li2CoSi tetrahedra, and corners with four equivalent O(4)Li2Si2 tetrahedra.