Li4Y3MnO8 crystallizes in the orthorhombic C222 space group. There are three inequivalent Li sites. In the first Li site, Li(1) is bonded in a square co-planar geometry to four equivalent O(3) atoms. In the second Li site, Li(2) is bonded in a square co-planar geometry to four equivalent O(3) atoms. In the third Li site, Li(3) is bonded in a square co-planar geometry to two equivalent O(1) and two equivalent O(2) atoms. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded to two equivalent O(1) and four equivalent O(3) atoms to form YO6 octahedra that share corners with four equivalent Mn(1)O6 octahedra and edges with four equivalent Y(2)O6 octahedra. The corner-sharing octahedral tilt angles are 11°. In the second Y site, Y(2) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form YO6 octahedra that share corners with four equivalent Y(2)O6 octahedra, edges with two equivalent Y(1)O6 octahedra, and edges with two equivalent Mn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 16-19°. Mn(1) is bonded to two equivalent O(2) and four equivalent O(3) atoms to form MnO6 octahedra that share corners with four equivalent Y(1)O6 octahedra and edges with four equivalent Y(2)O6 octahedra. The corner-sharing octahedral tilt angles are 11°. There are three inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Li(3), one Y(1), and two equivalent Y(2) atoms to form OLi2Y3 square pyramids that share  a cornercorner with one O(1)Li2Y3 square pyramid, corners with four equivalent O(2)Li2Y2Mn square pyramids, corners with four equivalent O(3)Li2Y2Mn square pyramids, edges with two equivalent O(2)Li2Y2Mn square pyramids, edges with two equivalent O(3)Li2Y2Mn square pyramids, and edges with two equivalent O(1)Li2Y3 square pyramids. In the second O site, O(2) is bonded to two equivalent Li(3), two equivalent Y(2), and one Mn(1) atom to form OLi2Y2Mn square pyramids that share  a cornercorner with one O(2)Li2Y2Mn square pyramid, corners with four equivalent O(3)Li2Y2Mn square pyramids, corners with four equivalent O(1)Li2Y3 square pyramids, edges with two equivalent O(2)Li2Y2Mn square pyramids, edges with two equivalent O(3)Li2Y2Mn square pyramids, and edges with two equivalent O(1)Li2Y3 square pyramids. In the third O site, O(3) is bonded to one Li(1), one Li(2), one Y(1), one Y(2), and one Mn(1) atom to form OLi2Y2Mn square pyramids that share corners with two equivalent O(2)Li2Y2Mn square pyramids, corners with two equivalent O(1)Li2Y3 square pyramids, corners with five equivalent O(3)Li2Y2Mn square pyramids,  an edgeedge with one O(2)Li2Y2Mn square pyramid,  an edgeedge with one O(1)Li2Y3 square pyramid, and edges with four equivalent O(3)Li2Y2Mn square pyramids.
Li4Y3MnO8 crystallizes in the orthorhombic C222 space group. There are three inequivalent Li sites. In the first Li site, Li(1) is bonded in a square co-planar geometry to four equivalent O(3) atoms. All Li(1)-O(3) bond lengths are 2.17 Å. In the second Li site, Li(2) is bonded in a square co-planar geometry to four equivalent O(3) atoms. All Li(2)-O(3) bond lengths are 2.18 Å. In the third Li site, Li(3) is bonded in a square co-planar geometry to two equivalent O(1) and two equivalent O(2) atoms. Both Li(3)-O(1) bond lengths are 2.22 Å. Both Li(3)-O(2) bond lengths are 2.16 Å. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded to two equivalent O(1) and four equivalent O(3) atoms to form YO6 octahedra that share corners with four equivalent Mn(1)O6 octahedra and edges with four equivalent Y(2)O6 octahedra. The corner-sharing octahedral tilt angles are 11°. Both Y(1)-O(1) bond lengths are 2.24 Å. All Y(1)-O(3) bond lengths are 2.30 Å. In the second Y site, Y(2) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form YO6 octahedra that share corners with four equivalent Y(2)O6 octahedra, edges with two equivalent Y(1)O6 octahedra, and edges with two equivalent Mn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 16-19°. Both Y(2)-O(1) bond lengths are 2.23 Å. Both Y(2)-O(2) bond lengths are 2.15 Å. Both Y(2)-O(3) bond lengths are 2.42 Å. Mn(1) is bonded to two equivalent O(2) and four equivalent O(3) atoms to form MnO6 octahedra that share corners with four equivalent Y(1)O6 octahedra and edges with four equivalent Y(2)O6 octahedra. The corner-sharing octahedral tilt angles are 11°. Both Mn(1)-O(2) bond lengths are 2.32 Å. All Mn(1)-O(3) bond lengths are 2.04 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Li(3), one Y(1), and two equivalent Y(2) atoms to form OLi2Y3 square pyramids that share  a cornercorner with one O(1)Li2Y3 square pyramid, corners with four equivalent O(2)Li2Y2Mn square pyramids, corners with four equivalent O(3)Li2Y2Mn square pyramids, edges with two equivalent O(2)Li2Y2Mn square pyramids, edges with two equivalent O(3)Li2Y2Mn square pyramids, and edges with two equivalent O(1)Li2Y3 square pyramids. In the second O site, O(2) is bonded to two equivalent Li(3), two equivalent Y(2), and one Mn(1) atom to form OLi2Y2Mn square pyramids that share  a cornercorner with one O(2)Li2Y2Mn square pyramid, corners with four equivalent O(3)Li2Y2Mn square pyramids, corners with four equivalent O(1)Li2Y3 square pyramids, edges with two equivalent O(2)Li2Y2Mn square pyramids, edges with two equivalent O(3)Li2Y2Mn square pyramids, and edges with two equivalent O(1)Li2Y3 square pyramids. In the third O site, O(3) is bonded to one Li(1), one Li(2), one Y(1), one Y(2), and one Mn(1) atom to form OLi2Y2Mn square pyramids that share corners with two equivalent O(2)Li2Y2Mn square pyramids, corners with two equivalent O(1)Li2Y3 square pyramids, corners with five equivalent O(3)Li2Y2Mn square pyramids,  an edgeedge with one O(2)Li2Y2Mn square pyramid,  an edgeedge with one O(1)Li2Y3 square pyramid, and edges with four equivalent O(3)Li2Y2Mn square pyramids.