Li4MnSn2Se7 is Stannite-like structured and crystallizes in the monoclinic Cc space group. There are four inequivalent Li sites. In the first Li site, Li(1) is bonded to one Se(2), one Se(3), one Se(5), and one Se(7) atom to form LiSe4 tetrahedra that share  a cornercorner with one Li(2)Se4 tetrahedra,  a cornercorner with one Sn(1)Se4 tetrahedra, corners with two equivalent Li(3)Se4 tetrahedra, corners with two equivalent Li(4)Se4 tetrahedra, corners with three equivalent Mn(1)Se4 tetrahedra, and corners with three equivalent Sn(2)Se4 tetrahedra. In the second Li site, Li(2) is bonded to one Se(1), one Se(4), one Se(6), and one Se(7) atom to form LiSe4 tetrahedra that share  a cornercorner with one Li(1)Se4 tetrahedra,  a cornercorner with one Mn(1)Se4 tetrahedra, corners with two equivalent Li(4)Se4 tetrahedra, corners with two equivalent Sn(2)Se4 tetrahedra, corners with three equivalent Li(3)Se4 tetrahedra, and corners with three equivalent Sn(1)Se4 tetrahedra. In the third Li site, Li(3) is bonded to one Se(1), one Se(2), one Se(4), and one Se(7) atom to form LiSe4 tetrahedra that share  a cornercorner with one Li(4)Se4 tetrahedra,  a cornercorner with one Mn(1)Se4 tetrahedra, corners with two equivalent Li(1)Se4 tetrahedra, corners with two equivalent Sn(1)Se4 tetrahedra, corners with three equivalent Li(2)Se4 tetrahedra, and corners with three equivalent Sn(2)Se4 tetrahedra. In the fourth Li site, Li(4) is bonded to one Se(3), one Se(4), one Se(5), and one Se(6) atom to form LiSe4 tetrahedra that share  a cornercorner with one Li(3)Se4 tetrahedra,  a cornercorner with one Sn(2)Se4 tetrahedra, corners with two equivalent Li(1)Se4 tetrahedra, corners with two equivalent Li(2)Se4 tetrahedra, corners with three equivalent Mn(1)Se4 tetrahedra, and corners with three equivalent Sn(1)Se4 tetrahedra. Mn(1) is bonded to one Se(2), one Se(3), one Se(5), and one Se(6) atom to form MnSe4 tetrahedra that share  a cornercorner with one Li(2)Se4 tetrahedra,  a cornercorner with one Li(3)Se4 tetrahedra, corners with two equivalent Sn(1)Se4 tetrahedra, corners with two equivalent Sn(2)Se4 tetrahedra, corners with three equivalent Li(1)Se4 tetrahedra, and corners with three equivalent Li(4)Se4 tetrahedra. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded to one Se(1), one Se(4), one Se(5), and one Se(6) atom to form SnSe4 tetrahedra that share  a cornercorner with one Li(1)Se4 tetrahedra,  a cornercorner with one Sn(2)Se4 tetrahedra, corners with two equivalent Li(3)Se4 tetrahedra, corners with two equivalent Mn(1)Se4 tetrahedra, corners with three equivalent Li(2)Se4 tetrahedra, and corners with three equivalent Li(4)Se4 tetrahedra. In the second Sn site, Sn(2) is bonded to one Se(1), one Se(2), one Se(3), and one Se(7) atom to form SnSe4 tetrahedra that share  a cornercorner with one Li(4)Se4 tetrahedra,  a cornercorner with one Sn(1)Se4 tetrahedra, corners with two equivalent Li(2)Se4 tetrahedra, corners with two equivalent Mn(1)Se4 tetrahedra, corners with three equivalent Li(1)Se4 tetrahedra, and corners with three equivalent Li(3)Se4 tetrahedra. There are seven inequivalent Se sites. In the first Se site, Se(3) is bonded to one Li(1), one Li(4), one Mn(1), and one Sn(2) atom to form SeLi2MnSn tetrahedra that share  a cornercorner with one Se(1)Li2Sn2 tetrahedra,  a cornercorner with one Se(4)Li3Sn tetrahedra, corners with two equivalent Se(6)Li2MnSn tetrahedra, corners with two equivalent Se(7)Li3Sn tetrahedra, corners with three equivalent Se(2)Li2MnSn tetrahedra, and corners with three equivalent Se(5)Li2MnSn tetrahedra. In the second Se site, Se(4) is bonded to one Li(2), one Li(3), one Li(4), and one Sn(1) atom to form SeLi3Sn tetrahedra that share  a cornercorner with one Se(2)Li2MnSn tetrahedra,  a cornercorner with one Se(3)Li2MnSn tetrahedra, corners with two equivalent Se(5)Li2MnSn tetrahedra, corners with two equivalent Se(7)Li3Sn tetrahedra, corners with three equivalent Se(6)Li2MnSn tetrahedra, and corners with three equivalent Se(1)Li2Sn2 tetrahedra. In the third Se site, Se(5) is bonded to one Li(1), one Li(4), one Mn(1), and one Sn(1) atom to form SeLi2MnSn tetrahedra that share  a cornercorner with one Se(1)Li2Sn2 tetrahedra,  a cornercorner with one Se(7)Li3Sn tetrahedra, corners with two equivalent Se(2)Li2MnSn tetrahedra, corners with two equivalent Se(4)Li3Sn tetrahedra, corners with three equivalent Se(3)Li2MnSn tetrahedra, and corners with three equivalent Se(6)Li2MnSn tetrahedra. In the fourth Se site, Se(6) is bonded to one Li(2), one Li(4), one Mn(1), and one Sn(1) atom to form SeLi2MnSn tetrahedra that share  a cornercorner with one Se(2)Li2MnSn tetrahedra,  a cornercorner with one Se(7)Li3Sn tetrahedra, corners with two equivalent Se(3)Li2MnSn tetrahedra, corners with two equivalent Se(1)Li2Sn2 tetrahedra, corners with three equivalent Se(5)Li2MnSn tetrahedra, and corners with three equivalent Se(4)Li3Sn tetrahedra. In the fifth Se site, Se(7) is bonded to one Li(1), one Li(2), one Li(3), and one Sn(2) atom to form SeLi3Sn tetrahedra that share  a cornercorner with one Se(5)Li2MnSn tetrahedra,  a cornercorner with one Se(6)Li2MnSn tetrahedra, corners with two equivalent Se(3)Li2MnSn tetrahedra, corners with two equivalent Se(4)Li3Sn tetrahedra, corners with three equivalent Se(2)Li2MnSn tetrahedra, and corners with three equivalent Se(1)Li2Sn2 tetrahedra. In the sixth Se site, Se(1) is bonded to one Li(2), one Li(3), one Sn(1), and one Sn(2) atom to form SeLi2Sn2 tetrahedra that share  a cornercorner with one Se(3)Li2MnSn tetrahedra,  a cornercorner with one Se(5)Li2MnSn tetrahedra, corners with two equivalent Se(2)Li2MnSn tetrahedra, corners with two equivalent Se(6)Li2MnSn tetrahedra, corners with three equivalent Se(4)Li3Sn tetrahedra, and corners with three equivalent Se(7)Li3Sn tetrahedra. In the seventh Se site, Se(2) is bonded to one Li(1), one Li(3), one Mn(1), and one Sn(2) atom to form SeLi2MnSn tetrahedra that share  a cornercorner with one Se(6)Li2MnSn tetrahedra,  a cornercorner with one Se(4)Li3Sn tetrahedra, corners with two equivalent Se(5)Li2MnSn tetrahedra, corners with two equivalent Se(1)Li2Sn2 tetrahedra, corners with three equivalent Se(3)Li2MnSn tetrahedra, and corners with three equivalent Se(7)Li3Sn tetrahedra.
Li4MnSn2Se7 is Stannite-like structured and crystallizes in the monoclinic Cc space group. There are four inequivalent Li sites. In the first Li site, Li(1) is bonded to one Se(2), one Se(3), one Se(5), and one Se(7) atom to form LiSe4 tetrahedra that share  a cornercorner with one Li(2)Se4 tetrahedra,  a cornercorner with one Sn(1)Se4 tetrahedra, corners with two equivalent Li(3)Se4 tetrahedra, corners with two equivalent Li(4)Se4 tetrahedra, corners with three equivalent Mn(1)Se4 tetrahedra, and corners with three equivalent Sn(2)Se4 tetrahedra. The Li(1)-Se(2) bond length is 2.63 Å. The Li(1)-Se(3) bond length is 2.58 Å. The Li(1)-Se(5) bond length is 2.58 Å. The Li(1)-Se(7) bond length is 2.54 Å. In the second Li site, Li(2) is bonded to one Se(1), one Se(4), one Se(6), and one Se(7) atom to form LiSe4 tetrahedra that share  a cornercorner with one Li(1)Se4 tetrahedra,  a cornercorner with one Mn(1)Se4 tetrahedra, corners with two equivalent Li(4)Se4 tetrahedra, corners with two equivalent Sn(2)Se4 tetrahedra, corners with three equivalent Li(3)Se4 tetrahedra, and corners with three equivalent Sn(1)Se4 tetrahedra. The Li(2)-Se(1) bond length is 2.70 Å. The Li(2)-Se(4) bond length is 2.52 Å. The Li(2)-Se(6) bond length is 2.63 Å. The Li(2)-Se(7) bond length is 2.52 Å. In the third Li site, Li(3) is bonded to one Se(1), one Se(2), one Se(4), and one Se(7) atom to form LiSe4 tetrahedra that share  a cornercorner with one Li(4)Se4 tetrahedra,  a cornercorner with one Mn(1)Se4 tetrahedra, corners with two equivalent Li(1)Se4 tetrahedra, corners with two equivalent Sn(1)Se4 tetrahedra, corners with three equivalent Li(2)Se4 tetrahedra, and corners with three equivalent Sn(2)Se4 tetrahedra. The Li(3)-Se(1) bond length is 2.70 Å. The Li(3)-Se(2) bond length is 2.57 Å. The Li(3)-Se(4) bond length is 2.52 Å. The Li(3)-Se(7) bond length is 2.53 Å. In the fourth Li site, Li(4) is bonded to one Se(3), one Se(4), one Se(5), and one Se(6) atom to form LiSe4 tetrahedra that share  a cornercorner with one Li(3)Se4 tetrahedra,  a cornercorner with one Sn(2)Se4 tetrahedra, corners with two equivalent Li(1)Se4 tetrahedra, corners with two equivalent Li(2)Se4 tetrahedra, corners with three equivalent Mn(1)Se4 tetrahedra, and corners with three equivalent Sn(1)Se4 tetrahedra. The Li(4)-Se(3) bond length is 2.56 Å. The Li(4)-Se(4) bond length is 2.56 Å. The Li(4)-Se(5) bond length is 2.62 Å. The Li(4)-Se(6) bond length is 2.61 Å. Mn(1) is bonded to one Se(2), one Se(3), one Se(5), and one Se(6) atom to form MnSe4 tetrahedra that share  a cornercorner with one Li(2)Se4 tetrahedra,  a cornercorner with one Li(3)Se4 tetrahedra, corners with two equivalent Sn(1)Se4 tetrahedra, corners with two equivalent Sn(2)Se4 tetrahedra, corners with three equivalent Li(1)Se4 tetrahedra, and corners with three equivalent Li(4)Se4 tetrahedra. The Mn(1)-Se(2) bond length is 2.56 Å. The Mn(1)-Se(3) bond length is 2.53 Å. The Mn(1)-Se(5) bond length is 2.55 Å. The Mn(1)-Se(6) bond length is 2.54 Å. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded to one Se(1), one Se(4), one Se(5), and one Se(6) atom to form SnSe4 tetrahedra that share  a cornercorner with one Li(1)Se4 tetrahedra,  a cornercorner with one Sn(2)Se4 tetrahedra, corners with two equivalent Li(3)Se4 tetrahedra, corners with two equivalent Mn(1)Se4 tetrahedra, corners with three equivalent Li(2)Se4 tetrahedra, and corners with three equivalent Li(4)Se4 tetrahedra. The Sn(1)-Se(1) bond length is 2.65 Å. The Sn(1)-Se(4) bond length is 2.52 Å. The Sn(1)-Se(5) bond length is 2.57 Å. The Sn(1)-Se(6) bond length is 2.57 Å. In the second Sn site, Sn(2) is bonded to one Se(1), one Se(2), one Se(3), and one Se(7) atom to form SnSe4 tetrahedra that share  a cornercorner with one Li(4)Se4 tetrahedra,  a cornercorner with one Sn(1)Se4 tetrahedra, corners with two equivalent Li(2)Se4 tetrahedra, corners with two equivalent Mn(1)Se4 tetrahedra, corners with three equivalent Li(1)Se4 tetrahedra, and corners with three equivalent Li(3)Se4 tetrahedra. The Sn(2)-Se(1) bond length is 2.64 Å. The Sn(2)-Se(2) bond length is 2.57 Å. The Sn(2)-Se(3) bond length is 2.57 Å. The Sn(2)-Se(7) bond length is 2.52 Å. There are seven inequivalent Se sites. In the first Se site, Se(3) is bonded to one Li(1), one Li(4), one Mn(1), and one Sn(2) atom to form SeLi2MnSn tetrahedra that share  a cornercorner with one Se(1)Li2Sn2 tetrahedra,  a cornercorner with one Se(4)Li3Sn tetrahedra, corners with two equivalent Se(6)Li2MnSn tetrahedra, corners with two equivalent Se(7)Li3Sn tetrahedra, corners with three equivalent Se(2)Li2MnSn tetrahedra, and corners with three equivalent Se(5)Li2MnSn tetrahedra. In the second Se site, Se(4) is bonded to one Li(2), one Li(3), one Li(4), and one Sn(1) atom to form SeLi3Sn tetrahedra that share  a cornercorner with one Se(2)Li2MnSn tetrahedra,  a cornercorner with one Se(3)Li2MnSn tetrahedra, corners with two equivalent Se(5)Li2MnSn tetrahedra, corners with two equivalent Se(7)Li3Sn tetrahedra, corners with three equivalent Se(6)Li2MnSn tetrahedra, and corners with three equivalent Se(1)Li2Sn2 tetrahedra. In the third Se site, Se(5) is bonded to one Li(1), one Li(4), one Mn(1), and one Sn(1) atom to form SeLi2MnSn tetrahedra that share  a cornercorner with one Se(1)Li2Sn2 tetrahedra,  a cornercorner with one Se(7)Li3Sn tetrahedra, corners with two equivalent Se(2)Li2MnSn tetrahedra, corners with two equivalent Se(4)Li3Sn tetrahedra, corners with three equivalent Se(3)Li2MnSn tetrahedra, and corners with three equivalent Se(6)Li2MnSn tetrahedra. In the fourth Se site, Se(6) is bonded to one Li(2), one Li(4), one Mn(1), and one Sn(1) atom to form SeLi2MnSn tetrahedra that share  a cornercorner with one Se(2)Li2MnSn tetrahedra,  a cornercorner with one Se(7)Li3Sn tetrahedra, corners with two equivalent Se(3)Li2MnSn tetrahedra, corners with two equivalent Se(1)Li2Sn2 tetrahedra, corners with three equivalent Se(5)Li2MnSn tetrahedra, and corners with three equivalent Se(4)Li3Sn tetrahedra. In the fifth Se site, Se(7) is bonded to one Li(1), one Li(2), one Li(3), and one Sn(2) atom to form SeLi3Sn tetrahedra that share  a cornercorner with one Se(5)Li2MnSn tetrahedra,  a cornercorner with one Se(6)Li2MnSn tetrahedra, corners with two equivalent Se(3)Li2MnSn tetrahedra, corners with two equivalent Se(4)Li3Sn tetrahedra, corners with three equivalent Se(2)Li2MnSn tetrahedra, and corners with three equivalent Se(1)Li2Sn2 tetrahedra. In the sixth Se site, Se(1) is bonded to one Li(2), one Li(3), one Sn(1), and one Sn(2) atom to form SeLi2Sn2 tetrahedra that share  a cornercorner with one Se(3)Li2MnSn tetrahedra,  a cornercorner with one Se(5)Li2MnSn tetrahedra, corners with two equivalent Se(2)Li2MnSn tetrahedra, corners with two equivalent Se(6)Li2MnSn tetrahedra, corners with three equivalent Se(4)Li3Sn tetrahedra, and corners with three equivalent Se(7)Li3Sn tetrahedra. In the seventh Se site, Se(2) is bonded to one Li(1), one Li(3), one Mn(1), and one Sn(2) atom to form SeLi2MnSn tetrahedra that share  a cornercorner with one Se(6)Li2MnSn tetrahedra,  a cornercorner with one Se(4)Li3Sn tetrahedra, corners with two equivalent Se(5)Li2MnSn tetrahedra, corners with two equivalent Se(1)Li2Sn2 tetrahedra, corners with three equivalent Se(3)Li2MnSn tetrahedra, and corners with three equivalent Se(7)Li3Sn tetrahedra.