Er3PrMn8 is Hexagonal Laves-derived structured and crystallizes in the monoclinic Cm space group. There are three inequivalent Er sites. In the first Er site, Er(1) is bonded in a 16-coordinate geometry to one Er(2), three equivalent Pr(1), one Mn(4), two equivalent Mn(3), two equivalent Mn(6), three equivalent Mn(1), and four equivalent Mn(5) atoms. In the second Er site, Er(2) is bonded in a 16-coordinate geometry to one Er(1), three equivalent Er(3), one Mn(4), two equivalent Mn(3), two equivalent Mn(6), three equivalent Mn(2), and four equivalent Mn(5) atoms. In the third Er site, Er(3) is bonded in a 16-coordinate geometry to three equivalent Er(2), one Pr(1), one Mn(6), two equivalent Mn(4), two equivalent Mn(5), three equivalent Mn(2), and four equivalent Mn(3) atoms. Pr(1) is bonded in a 16-coordinate geometry to one Er(3), three equivalent Er(1), one Mn(6), two equivalent Mn(4), two equivalent Mn(5), three equivalent Mn(1), and four equivalent Mn(3) atoms. There are six inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to three equivalent Er(1), three equivalent Pr(1), one Mn(4), one Mn(6), two equivalent Mn(3), and two equivalent Mn(5) atoms to form MnPr3Er3Mn6 cuboctahedra that share corners with two equivalent Mn(4)Pr2Er4Mn6 cuboctahedra, corners with two equivalent Mn(6)PrEr5Mn6 cuboctahedra, corners with four equivalent Mn(3)Pr2Er4Mn6 cuboctahedra, corners with four equivalent Mn(5)PrEr5Mn6 cuboctahedra, edges with six equivalent Mn(1)Pr3Er3Mn6 cuboctahedra, faces with two equivalent Mn(2)Er6Mn6 cuboctahedra, faces with three equivalent Mn(4)Pr2Er4Mn6 cuboctahedra, faces with three equivalent Mn(6)PrEr5Mn6 cuboctahedra, faces with six equivalent Mn(3)Pr2Er4Mn6 cuboctahedra, and faces with six equivalent Mn(5)PrEr5Mn6 cuboctahedra. In the second Mn site, Mn(2) is bonded to three equivalent Er(2), three equivalent Er(3), one Mn(4), one Mn(6), two equivalent Mn(3), and two equivalent Mn(5) atoms to form MnEr6Mn6 cuboctahedra that share corners with two equivalent Mn(4)Pr2Er4Mn6 cuboctahedra, corners with two equivalent Mn(6)PrEr5Mn6 cuboctahedra, corners with four equivalent Mn(3)Pr2Er4Mn6 cuboctahedra, corners with four equivalent Mn(5)PrEr5Mn6 cuboctahedra, edges with six equivalent Mn(2)Er6Mn6 cuboctahedra, faces with two equivalent Mn(1)Pr3Er3Mn6 cuboctahedra, faces with three equivalent Mn(4)Pr2Er4Mn6 cuboctahedra, faces with three equivalent Mn(6)PrEr5Mn6 cuboctahedra, faces with six equivalent Mn(3)Pr2Er4Mn6 cuboctahedra, and faces with six equivalent Mn(5)PrEr5Mn6 cuboctahedra. In the third Mn site, Mn(3) is bonded to one Er(1), one Er(2), two equivalent Er(3), two equivalent Pr(1), one Mn(1), one Mn(2), two equivalent Mn(3), and two equivalent Mn(4) atoms to form MnPr2Er4Mn6 cuboctahedra that share corners with two equivalent Mn(2)Er6Mn6 cuboctahedra, corners with two equivalent Mn(1)Pr3Er3Mn6 cuboctahedra, corners with four equivalent Mn(3)Pr2Er4Mn6 cuboctahedra, corners with four equivalent Mn(6)PrEr5Mn6 cuboctahedra, corners with six equivalent Mn(5)PrEr5Mn6 cuboctahedra, edges with two equivalent Mn(3)Pr2Er4Mn6 cuboctahedra, edges with four equivalent Mn(5)PrEr5Mn6 cuboctahedra, faces with two equivalent Mn(5)PrEr5Mn6 cuboctahedra, faces with two equivalent Mn(6)PrEr5Mn6 cuboctahedra, faces with three equivalent Mn(2)Er6Mn6 cuboctahedra, faces with three equivalent Mn(1)Pr3Er3Mn6 cuboctahedra, faces with four equivalent Mn(3)Pr2Er4Mn6 cuboctahedra, and faces with four equivalent Mn(4)Pr2Er4Mn6 cuboctahedra. In the fourth Mn site, Mn(4) is bonded to one Er(1), one Er(2), two equivalent Er(3), two equivalent Pr(1), one Mn(1), one Mn(2), and four equivalent Mn(3) atoms to form MnPr2Er4Mn6 cuboctahedra that share corners with two equivalent Mn(2)Er6Mn6 cuboctahedra, corners with two equivalent Mn(1)Pr3Er3Mn6 cuboctahedra, corners with two equivalent Mn(6)PrEr5Mn6 cuboctahedra, corners with four equivalent Mn(4)Pr2Er4Mn6 cuboctahedra, corners with eight equivalent Mn(5)PrEr5Mn6 cuboctahedra, edges with two equivalent Mn(4)Pr2Er4Mn6 cuboctahedra, edges with four equivalent Mn(6)PrEr5Mn6 cuboctahedra, faces with three equivalent Mn(2)Er6Mn6 cuboctahedra, faces with three equivalent Mn(1)Pr3Er3Mn6 cuboctahedra, faces with four equivalent Mn(5)PrEr5Mn6 cuboctahedra, and faces with eight equivalent Mn(3)Pr2Er4Mn6 cuboctahedra. In the fifth Mn site, Mn(5) is bonded to one Er(3), two equivalent Er(1), two equivalent Er(2), one Pr(1), one Mn(1), one Mn(2), two equivalent Mn(5), and two equivalent Mn(6) atoms to form MnPrEr5Mn6 cuboctahedra that share corners with two equivalent Mn(2)Er6Mn6 cuboctahedra, corners with two equivalent Mn(1)Pr3Er3Mn6 cuboctahedra, corners with four equivalent Mn(4)Pr2Er4Mn6 cuboctahedra, corners with four equivalent Mn(5)PrEr5Mn6 cuboctahedra, corners with six equivalent Mn(3)Pr2Er4Mn6 cuboctahedra, edges with two equivalent Mn(5)PrEr5Mn6 cuboctahedra, edges with four equivalent Mn(3)Pr2Er4Mn6 cuboctahedra, faces with two equivalent Mn(3)Pr2Er4Mn6 cuboctahedra, faces with two equivalent Mn(4)Pr2Er4Mn6 cuboctahedra, faces with three equivalent Mn(2)Er6Mn6 cuboctahedra, faces with three equivalent Mn(1)Pr3Er3Mn6 cuboctahedra, faces with four equivalent Mn(5)PrEr5Mn6 cuboctahedra, and faces with four equivalent Mn(6)PrEr5Mn6 cuboctahedra. In the sixth Mn site, Mn(6) is bonded to one Er(3), two equivalent Er(1), two equivalent Er(2), one Pr(1), one Mn(1), one Mn(2), and four equivalent Mn(5) atoms to form MnPrEr5Mn6 cuboctahedra that share corners with two equivalent Mn(2)Er6Mn6 cuboctahedra, corners with two equivalent Mn(4)Pr2Er4Mn6 cuboctahedra, corners with two equivalent Mn(1)Pr3Er3Mn6 cuboctahedra, corners with four equivalent Mn(6)PrEr5Mn6 cuboctahedra, corners with eight equivalent Mn(3)Pr2Er4Mn6 cuboctahedra, edges with two equivalent Mn(6)PrEr5Mn6 cuboctahedra, edges with four equivalent Mn(4)Pr2Er4Mn6 cuboctahedra, faces with three equivalent Mn(2)Er6Mn6 cuboctahedra, faces with three equivalent Mn(1)Pr3Er3Mn6 cuboctahedra, faces with four equivalent Mn(3)Pr2Er4Mn6 cuboctahedra, and faces with eight equivalent Mn(5)PrEr5Mn6 cuboctahedra.
Er3PrMn8 is Hexagonal Laves-derived structured and crystallizes in the monoclinic Cm space group. There are three inequivalent Er sites. In the first Er site, Er(1) is bonded in a 16-coordinate geometry to one Er(2), three equivalent Pr(1), one Mn(4), two equivalent Mn(3), two equivalent Mn(6), three equivalent Mn(1), and four equivalent Mn(5) atoms. The Er(1)-Er(2) bond length is 3.20 Å. There is one shorter (3.22 Å) and two longer (3.29 Å) Er(1)-Pr(1) bond lengths. The Er(1)-Mn(4) bond length is 3.10 Å. Both Er(1)-Mn(3) bond lengths are 3.18 Å. Both Er(1)-Mn(6) bond lengths are 3.14 Å. There is one shorter (3.09 Å) and two longer (3.14 Å) Er(1)-Mn(1) bond lengths. All Er(1)-Mn(5) bond lengths are 3.12 Å. In the second Er site, Er(2) is bonded in a 16-coordinate geometry to one Er(1), three equivalent Er(3), one Mn(4), two equivalent Mn(3), two equivalent Mn(6), three equivalent Mn(2), and four equivalent Mn(5) atoms. There is one shorter (3.23 Å) and two longer (3.25 Å) Er(2)-Er(3) bond lengths. The Er(2)-Mn(4) bond length is 2.99 Å. Both Er(2)-Mn(3) bond lengths are 3.06 Å. Both Er(2)-Mn(6) bond lengths are 3.12 Å. There is one shorter (3.08 Å) and two longer (3.14 Å) Er(2)-Mn(2) bond lengths. There are two shorter (3.04 Å) and two longer (3.11 Å) Er(2)-Mn(5) bond lengths. In the third Er site, Er(3) is bonded in a 16-coordinate geometry to three equivalent Er(2), one Pr(1), one Mn(6), two equivalent Mn(4), two equivalent Mn(5), three equivalent Mn(2), and four equivalent Mn(3) atoms. The Er(3)-Pr(1) bond length is 3.25 Å. The Er(3)-Mn(6) bond length is 2.96 Å. Both Er(3)-Mn(4) bond lengths are 3.13 Å. Both Er(3)-Mn(5) bond lengths are 3.05 Å. There is one shorter (3.08 Å) and two longer (3.14 Å) Er(3)-Mn(2) bond lengths. There are two shorter (3.06 Å) and two longer (3.11 Å) Er(3)-Mn(3) bond lengths. Pr(1) is bonded in a 16-coordinate geometry to one Er(3), three equivalent Er(1), one Mn(6), two equivalent Mn(4), two equivalent Mn(5), three equivalent Mn(1), and four equivalent Mn(3) atoms. The Pr(1)-Mn(6) bond length is 3.09 Å. Both Pr(1)-Mn(4) bond lengths are 3.15 Å. Both Pr(1)-Mn(5) bond lengths are 3.16 Å. There is one shorter (3.12 Å) and two longer (3.13 Å) Pr(1)-Mn(1) bond lengths. There are two shorter (3.13 Å) and two longer (3.14 Å) Pr(1)-Mn(3) bond lengths. There are six inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to three equivalent Er(1), three equivalent Pr(1), one Mn(4), one Mn(6), two equivalent Mn(3), and two equivalent Mn(5) atoms to form MnPr3Er3Mn6 cuboctahedra that share corners with two equivalent Mn(4)Pr2Er4Mn6 cuboctahedra, corners with two equivalent Mn(6)PrEr5Mn6 cuboctahedra, corners with four equivalent Mn(3)Pr2Er4Mn6 cuboctahedra, corners with four equivalent Mn(5)PrEr5Mn6 cuboctahedra, edges with six equivalent Mn(1)Pr3Er3Mn6 cuboctahedra, faces with two equivalent Mn(2)Er6Mn6 cuboctahedra, faces with three equivalent Mn(4)Pr2Er4Mn6 cuboctahedra, faces with three equivalent Mn(6)PrEr5Mn6 cuboctahedra, faces with six equivalent Mn(3)Pr2Er4Mn6 cuboctahedra, and faces with six equivalent Mn(5)PrEr5Mn6 cuboctahedra. The Mn(1)-Mn(4) bond length is 2.71 Å. The Mn(1)-Mn(6) bond length is 2.69 Å. Both Mn(1)-Mn(3) bond lengths are 2.70 Å. Both Mn(1)-Mn(5) bond lengths are 2.65 Å. In the second Mn site, Mn(2) is bonded to three equivalent Er(2), three equivalent Er(3), one Mn(4), one Mn(6), two equivalent Mn(3), and two equivalent Mn(5) atoms to form MnEr6Mn6 cuboctahedra that share corners with two equivalent Mn(4)Pr2Er4Mn6 cuboctahedra, corners with two equivalent Mn(6)PrEr5Mn6 cuboctahedra, corners with four equivalent Mn(3)Pr2Er4Mn6 cuboctahedra, corners with four equivalent Mn(5)PrEr5Mn6 cuboctahedra, edges with six equivalent Mn(2)Er6Mn6 cuboctahedra, faces with two equivalent Mn(1)Pr3Er3Mn6 cuboctahedra, faces with three equivalent Mn(4)Pr2Er4Mn6 cuboctahedra, faces with three equivalent Mn(6)PrEr5Mn6 cuboctahedra, faces with six equivalent Mn(3)Pr2Er4Mn6 cuboctahedra, and faces with six equivalent Mn(5)PrEr5Mn6 cuboctahedra. The Mn(2)-Mn(4) bond length is 2.69 Å. The Mn(2)-Mn(6) bond length is 2.66 Å. Both Mn(2)-Mn(3) bond lengths are 2.57 Å. Both Mn(2)-Mn(5) bond lengths are 2.55 Å. In the third Mn site, Mn(3) is bonded to one Er(1), one Er(2), two equivalent Er(3), two equivalent Pr(1), one Mn(1), one Mn(2), two equivalent Mn(3), and two equivalent Mn(4) atoms to form MnPr2Er4Mn6 cuboctahedra that share corners with two equivalent Mn(2)Er6Mn6 cuboctahedra, corners with two equivalent Mn(1)Pr3Er3Mn6 cuboctahedra, corners with four equivalent Mn(3)Pr2Er4Mn6 cuboctahedra, corners with four equivalent Mn(6)PrEr5Mn6 cuboctahedra, corners with six equivalent Mn(5)PrEr5Mn6 cuboctahedra, edges with two equivalent Mn(3)Pr2Er4Mn6 cuboctahedra, edges with four equivalent Mn(5)PrEr5Mn6 cuboctahedra, faces with two equivalent Mn(5)PrEr5Mn6 cuboctahedra, faces with two equivalent Mn(6)PrEr5Mn6 cuboctahedra, faces with three equivalent Mn(2)Er6Mn6 cuboctahedra, faces with three equivalent Mn(1)Pr3Er3Mn6 cuboctahedra, faces with four equivalent Mn(3)Pr2Er4Mn6 cuboctahedra, and faces with four equivalent Mn(4)Pr2Er4Mn6 cuboctahedra. There is one shorter (2.63 Å) and one longer (2.75 Å) Mn(3)-Mn(3) bond length. There is one shorter (2.61 Å) and one longer (2.69 Å) Mn(3)-Mn(4) bond length. In the fourth Mn site, Mn(4) is bonded to one Er(1), one Er(2), two equivalent Er(3), two equivalent Pr(1), one Mn(1), one Mn(2), and four equivalent Mn(3) atoms to form MnPr2Er4Mn6 cuboctahedra that share corners with two equivalent Mn(2)Er6Mn6 cuboctahedra, corners with two equivalent Mn(1)Pr3Er3Mn6 cuboctahedra, corners with two equivalent Mn(6)PrEr5Mn6 cuboctahedra, corners with four equivalent Mn(4)Pr2Er4Mn6 cuboctahedra, corners with eight equivalent Mn(5)PrEr5Mn6 cuboctahedra, edges with two equivalent Mn(4)Pr2Er4Mn6 cuboctahedra, edges with four equivalent Mn(6)PrEr5Mn6 cuboctahedra, faces with three equivalent Mn(2)Er6Mn6 cuboctahedra, faces with three equivalent Mn(1)Pr3Er3Mn6 cuboctahedra, faces with four equivalent Mn(5)PrEr5Mn6 cuboctahedra, and faces with eight equivalent Mn(3)Pr2Er4Mn6 cuboctahedra. In the fifth Mn site, Mn(5) is bonded to one Er(3), two equivalent Er(1), two equivalent Er(2), one Pr(1), one Mn(1), one Mn(2), two equivalent Mn(5), and two equivalent Mn(6) atoms to form MnPrEr5Mn6 cuboctahedra that share corners with two equivalent Mn(2)Er6Mn6 cuboctahedra, corners with two equivalent Mn(1)Pr3Er3Mn6 cuboctahedra, corners with four equivalent Mn(4)Pr2Er4Mn6 cuboctahedra, corners with four equivalent Mn(5)PrEr5Mn6 cuboctahedra, corners with six equivalent Mn(3)Pr2Er4Mn6 cuboctahedra, edges with two equivalent Mn(5)PrEr5Mn6 cuboctahedra, edges with four equivalent Mn(3)Pr2Er4Mn6 cuboctahedra, faces with two equivalent Mn(3)Pr2Er4Mn6 cuboctahedra, faces with two equivalent Mn(4)Pr2Er4Mn6 cuboctahedra, faces with three equivalent Mn(2)Er6Mn6 cuboctahedra, faces with three equivalent Mn(1)Pr3Er3Mn6 cuboctahedra, faces with four equivalent Mn(5)PrEr5Mn6 cuboctahedra, and faces with four equivalent Mn(6)PrEr5Mn6 cuboctahedra. There is one shorter (2.63 Å) and one longer (2.75 Å) Mn(5)-Mn(5) bond length. There is one shorter (2.62 Å) and one longer (2.68 Å) Mn(5)-Mn(6) bond length. In the sixth Mn site, Mn(6) is bonded to one Er(3), two equivalent Er(1), two equivalent Er(2), one Pr(1), one Mn(1), one Mn(2), and four equivalent Mn(5) atoms to form MnPrEr5Mn6 cuboctahedra that share corners with two equivalent Mn(2)Er6Mn6 cuboctahedra, corners with two equivalent Mn(4)Pr2Er4Mn6 cuboctahedra, corners with two equivalent Mn(1)Pr3Er3Mn6 cuboctahedra, corners with four equivalent Mn(6)PrEr5Mn6 cuboctahedra, corners with eight equivalent Mn(3)Pr2Er4Mn6 cuboctahedra, edges with two equivalent Mn(6)PrEr5Mn6 cuboctahedra, edges with four equivalent Mn(4)Pr2Er4Mn6 cuboctahedra, faces with three equivalent Mn(2)Er6Mn6 cuboctahedra, faces with three equivalent Mn(1)Pr3Er3Mn6 cuboctahedra, faces with four equivalent Mn(3)Pr2Er4Mn6 cuboctahedra, and faces with eight equivalent Mn(5)PrEr5Mn6 cuboctahedra.