Eu9(Ni13P6)2 crystallizes in the hexagonal P-6m2 space group. There are three inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a 16-coordinate geometry to two equivalent Ni(2), two equivalent Ni(3), two equivalent Ni(4), two equivalent Ni(5), four equivalent Ni(6), and four equivalent P(2) atoms. In the second Eu site, Eu(2) is bonded in a 14-coordinate geometry to two equivalent Ni(1), two equivalent Ni(5), two equivalent Ni(8), four equivalent Ni(4), and four equivalent P(2) atoms. In the third Eu site, Eu(3) is bonded in a 16-coordinate geometry to two equivalent Ni(1), two equivalent Ni(6), two equivalent Ni(7), four equivalent Ni(5), two equivalent P(1), and four equivalent P(3) atoms. There are eight inequivalent Ni sites. In the first Ni site, Ni(7) is bonded in a 9-coordinate geometry to six equivalent Eu(3) and three equivalent P(3) atoms. In the second Ni site, Ni(8) is bonded in a 9-coordinate geometry to six equivalent Eu(2) and three equivalent Ni(4) atoms. In the third Ni site, Ni(1) is bonded to two equivalent Eu(2), two equivalent Eu(3), two equivalent P(2), and two equivalent P(3) atoms to form a mixture of distorted edge, corner, and face-sharing NiEu4P4 tetrahedra. In the fourth Ni site, Ni(2) is bonded in a distorted single-bond geometry to two equivalent Eu(1), four equivalent Ni(3), and one P(1) atom. In the fifth Ni site, Ni(3) is bonded in a 10-coordinate geometry to two equivalent Eu(1), two equivalent Ni(3), two equivalent Ni(6), and four equivalent Ni(2) atoms. In the sixth Ni site, Ni(4) is bonded in a 9-coordinate geometry to two equivalent Eu(1), four equivalent Eu(2), one Ni(8), and two equivalent P(2) atoms. In the seventh Ni site, Ni(5) is bonded to one Eu(1), one Eu(2), two equivalent Eu(3), one P(1), one P(3), and two equivalent P(2) atoms to form a mixture of distorted edge, corner, and face-sharing NiEu4P4 tetrahedra. In the eighth Ni site, Ni(6) is bonded in a 3-coordinate geometry to one Eu(3), two equivalent Eu(1), one Ni(3), one P(2), and two equivalent P(1) atoms. There are three inequivalent P sites. In the first P site, P(1) is bonded in a 9-coordinate geometry to two equivalent Eu(3), one Ni(2), two equivalent Ni(5), and four equivalent Ni(6) atoms. In the second P site, P(2) is bonded in a 9-coordinate geometry to two equivalent Eu(1), two equivalent Eu(2), one Ni(1), one Ni(4), one Ni(6), and two equivalent Ni(5) atoms. In the third P site, P(3) is bonded in a 9-coordinate geometry to four equivalent Eu(3), one Ni(7), two equivalent Ni(1), and two equivalent Ni(5) atoms.
Eu9(Ni13P6)2 crystallizes in the hexagonal P-6m2 space group. There are three inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a 16-coordinate geometry to two equivalent Ni(2), two equivalent Ni(3), two equivalent Ni(4), two equivalent Ni(5), four equivalent Ni(6), and four equivalent P(2) atoms. Both Eu(1)-Ni(2) bond lengths are 3.13 Å. Both Eu(1)-Ni(3) bond lengths are 2.95 Å. Both Eu(1)-Ni(4) bond lengths are 3.01 Å. Both Eu(1)-Ni(5) bond lengths are 3.16 Å. All Eu(1)-Ni(6) bond lengths are 3.05 Å. All Eu(1)-P(2) bond lengths are 3.07 Å. In the second Eu site, Eu(2) is bonded in a 14-coordinate geometry to two equivalent Ni(1), two equivalent Ni(5), two equivalent Ni(8), four equivalent Ni(4), and four equivalent P(2) atoms. Both Eu(2)-Ni(1) bond lengths are 3.15 Å. Both Eu(2)-Ni(5) bond lengths are 3.15 Å. Both Eu(2)-Ni(8) bond lengths are 2.96 Å. All Eu(2)-Ni(4) bond lengths are 3.01 Å. All Eu(2)-P(2) bond lengths are 2.99 Å. In the third Eu site, Eu(3) is bonded in a 16-coordinate geometry to two equivalent Ni(1), two equivalent Ni(6), two equivalent Ni(7), four equivalent Ni(5), two equivalent P(1), and four equivalent P(3) atoms. Both Eu(3)-Ni(1) bond lengths are 3.12 Å. Both Eu(3)-Ni(6) bond lengths are 3.08 Å. Both Eu(3)-Ni(7) bond lengths are 2.97 Å. All Eu(3)-Ni(5) bond lengths are 3.12 Å. Both Eu(3)-P(1) bond lengths are 2.95 Å. All Eu(3)-P(3) bond lengths are 2.99 Å. There are eight inequivalent Ni sites. In the first Ni site, Ni(7) is bonded in a 9-coordinate geometry to six equivalent Eu(3) and three equivalent P(3) atoms. All Ni(7)-P(3) bond lengths are 2.31 Å. In the second Ni site, Ni(8) is bonded in a 9-coordinate geometry to six equivalent Eu(2) and three equivalent Ni(4) atoms. All Ni(8)-Ni(4) bond lengths are 2.38 Å. In the third Ni site, Ni(1) is bonded to two equivalent Eu(2), two equivalent Eu(3), two equivalent P(2), and two equivalent P(3) atoms to form a mixture of distorted edge, corner, and face-sharing NiEu4P4 tetrahedra. Both Ni(1)-P(2) bond lengths are 2.34 Å. Both Ni(1)-P(3) bond lengths are 2.29 Å. In the fourth Ni site, Ni(2) is bonded in a distorted single-bond geometry to two equivalent Eu(1), four equivalent Ni(3), and one P(1) atom. All Ni(2)-Ni(3) bond lengths are 2.45 Å. The Ni(2)-P(1) bond length is 2.16 Å. In the fifth Ni site, Ni(3) is bonded in a 10-coordinate geometry to two equivalent Eu(1), two equivalent Ni(3), two equivalent Ni(6), and four equivalent Ni(2) atoms. Both Ni(3)-Ni(3) bond lengths are 2.38 Å. Both Ni(3)-Ni(6) bond lengths are 2.52 Å. In the sixth Ni site, Ni(4) is bonded in a 9-coordinate geometry to two equivalent Eu(1), four equivalent Eu(2), one Ni(8), and two equivalent P(2) atoms. Both Ni(4)-P(2) bond lengths are 2.28 Å. In the seventh Ni site, Ni(5) is bonded to one Eu(1), one Eu(2), two equivalent Eu(3), one P(1), one P(3), and two equivalent P(2) atoms to form a mixture of distorted edge, corner, and face-sharing NiEu4P4 tetrahedra. The Ni(5)-P(1) bond length is 2.36 Å. The Ni(5)-P(3) bond length is 2.35 Å. Both Ni(5)-P(2) bond lengths are 2.29 Å. In the eighth Ni site, Ni(6) is bonded in a 3-coordinate geometry to one Eu(3), two equivalent Eu(1), one Ni(3), one P(2), and two equivalent P(1) atoms. The Ni(6)-P(2) bond length is 2.23 Å. Both Ni(6)-P(1) bond lengths are 2.34 Å. There are three inequivalent P sites. In the first P site, P(1) is bonded in a 9-coordinate geometry to two equivalent Eu(3), one Ni(2), two equivalent Ni(5), and four equivalent Ni(6) atoms. In the second P site, P(2) is bonded in a 9-coordinate geometry to two equivalent Eu(1), two equivalent Eu(2), one Ni(1), one Ni(4), one Ni(6), and two equivalent Ni(5) atoms. In the third P site, P(3) is bonded in a 9-coordinate geometry to four equivalent Eu(3), one Ni(7), two equivalent Ni(1), and two equivalent Ni(5) atoms.