LiMnPO4 crystallizes in the monoclinic Pc space group. There are two inequivalent Li sites. In the first Li site, Li(1) is bonded to one O(1), one O(3), one O(4), and one O(8) atom to form LiO4 tetrahedra that share  a cornercorner with one Mn(1)O4 tetrahedra,  a cornercorner with one P(1)O4 tetrahedra, and corners with three equivalent P(2)O4 tetrahedra. In the second Li site, Li(2) is bonded to one O(2), one O(5), one O(6), and one O(7) atom to form LiO4 tetrahedra that share  a cornercorner with one P(2)O4 tetrahedra, corners with three equivalent Mn(1)O4 tetrahedra, and corners with three equivalent P(1)O4 tetrahedra. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(2), one O(4), one O(6), and one O(7) atom to form MnO4 tetrahedra that share  a cornercorner with one Li(1)O4 tetrahedra, corners with two equivalent P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, and corners with three equivalent Li(2)O4 tetrahedra. In the second Mn site, Mn(2) is bonded in a 5-coordinate geometry to one O(1), one O(3), one O(4), one O(5), and one O(8) atom. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(2), one O(5), one O(7), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one Li(1)O4 tetrahedra, corners with two equivalent Mn(1)O4 tetrahedra, and corners with three equivalent Li(2)O4 tetrahedra. In the second P site, P(2) is bonded to one O(1), one O(3), one O(4), and one O(6) atom to form PO4 tetrahedra that share  a cornercorner with one Li(2)O4 tetrahedra, corners with two equivalent Mn(1)O4 tetrahedra, and corners with three equivalent Li(1)O4 tetrahedra. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to one Li(1), one Mn(2), and one P(2) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one Li(2), one Mn(1), and one P(1) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Li(1), one Mn(2), and one P(2) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Li(1), one Mn(1), one Mn(2), and one P(2) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Li(2), one Mn(2), and one P(1) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Li(2), one Mn(1), and one P(2) atom. In the seventh O site, O(7) is bonded in a trigonal planar geometry to one Li(2), one Mn(1), and one P(1) atom. In the eighth O site, O(8) is bonded in a T-shaped geometry to one Li(1), one Mn(2), and one P(1) atom.
LiMnPO4 crystallizes in the monoclinic Pc space group. There are two inequivalent Li sites. In the first Li site, Li(1) is bonded to one O(1), one O(3), one O(4), and one O(8) atom to form LiO4 tetrahedra that share  a cornercorner with one Mn(1)O4 tetrahedra,  a cornercorner with one P(1)O4 tetrahedra, and corners with three equivalent P(2)O4 tetrahedra. The Li(1)-O(1) bond length is 1.94 Å. The Li(1)-O(3) bond length is 1.97 Å. The Li(1)-O(4) bond length is 2.08 Å. The Li(1)-O(8) bond length is 1.91 Å. In the second Li site, Li(2) is bonded to one O(2), one O(5), one O(6), and one O(7) atom to form LiO4 tetrahedra that share  a cornercorner with one P(2)O4 tetrahedra, corners with three equivalent Mn(1)O4 tetrahedra, and corners with three equivalent P(1)O4 tetrahedra. The Li(2)-O(2) bond length is 1.95 Å. The Li(2)-O(5) bond length is 1.91 Å. The Li(2)-O(6) bond length is 2.02 Å. The Li(2)-O(7) bond length is 1.93 Å. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(2), one O(4), one O(6), and one O(7) atom to form MnO4 tetrahedra that share  a cornercorner with one Li(1)O4 tetrahedra, corners with two equivalent P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, and corners with three equivalent Li(2)O4 tetrahedra. The Mn(1)-O(2) bond length is 2.09 Å. The Mn(1)-O(4) bond length is 2.11 Å. The Mn(1)-O(6) bond length is 2.10 Å. The Mn(1)-O(7) bond length is 2.07 Å. In the second Mn site, Mn(2) is bonded in a 5-coordinate geometry to one O(1), one O(3), one O(4), one O(5), and one O(8) atom. The Mn(2)-O(1) bond length is 2.08 Å. The Mn(2)-O(3) bond length is 2.07 Å. The Mn(2)-O(4) bond length is 2.66 Å. The Mn(2)-O(5) bond length is 2.13 Å. The Mn(2)-O(8) bond length is 2.17 Å. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(2), one O(5), one O(7), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one Li(1)O4 tetrahedra, corners with two equivalent Mn(1)O4 tetrahedra, and corners with three equivalent Li(2)O4 tetrahedra. The P(1)-O(2) bond length is 1.56 Å. The P(1)-O(5) bond length is 1.56 Å. The P(1)-O(7) bond length is 1.56 Å. The P(1)-O(8) bond length is 1.56 Å. In the second P site, P(2) is bonded to one O(1), one O(3), one O(4), and one O(6) atom to form PO4 tetrahedra that share  a cornercorner with one Li(2)O4 tetrahedra, corners with two equivalent Mn(1)O4 tetrahedra, and corners with three equivalent Li(1)O4 tetrahedra. The P(2)-O(1) bond length is 1.56 Å. The P(2)-O(3) bond length is 1.55 Å. The P(2)-O(4) bond length is 1.58 Å. The P(2)-O(6) bond length is 1.54 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to one Li(1), one Mn(2), and one P(2) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one Li(2), one Mn(1), and one P(1) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Li(1), one Mn(2), and one P(2) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Li(1), one Mn(1), one Mn(2), and one P(2) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Li(2), one Mn(2), and one P(1) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Li(2), one Mn(1), and one P(2) atom. In the seventh O site, O(7) is bonded in a trigonal planar geometry to one Li(2), one Mn(1), and one P(1) atom. In the eighth O site, O(8) is bonded in a T-shaped geometry to one Li(1), one Mn(2), and one P(1) atom.