Eu5Ga9 crystallizes in the orthorhombic Cmcm space group. There are three inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a 12-coordinate geometry to one Ga(1), two equivalent Ga(3), four equivalent Ga(4), and five equivalent Ga(2) atoms. In the second Eu site, Eu(2) is bonded in a 11-coordinate geometry to one Ga(2), two equivalent Ga(4), two equivalent Ga(5), three equivalent Ga(1), and three equivalent Ga(3) atoms. In the third Eu site, Eu(3) is bonded in a 9-coordinate geometry to two equivalent Ga(3), three equivalent Ga(5), and four equivalent Ga(1) atoms. There are five inequivalent Ga sites. In the first Ga site, Ga(4) is bonded in a 10-coordinate geometry to two equivalent Eu(2), four equivalent Eu(1), one Ga(1), one Ga(3), and two equivalent Ga(2) atoms. In the second Ga site, Ga(5) is bonded in a 9-coordinate geometry to three equivalent Eu(3), four equivalent Eu(2), and two equivalent Ga(1) atoms. In the third Ga site, Ga(1) is bonded in a 10-coordinate geometry to one Eu(1), two equivalent Eu(3), three equivalent Eu(2), one Ga(4), one Ga(5), and two equivalent Ga(3) atoms. In the fourth Ga site, Ga(2) is bonded in a 10-coordinate geometry to one Eu(2), five equivalent Eu(1), one Ga(2), one Ga(3), and two equivalent Ga(4) atoms. In the fifth Ga site, Ga(3) is bonded in a 10-coordinate geometry to one Eu(3), two equivalent Eu(1), three equivalent Eu(2), one Ga(2), one Ga(4), and two equivalent Ga(1) atoms.
Eu5Ga9 crystallizes in the orthorhombic Cmcm space group. There are three inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a 12-coordinate geometry to one Ga(1), two equivalent Ga(3), four equivalent Ga(4), and five equivalent Ga(2) atoms. The Eu(1)-Ga(1) bond length is 3.26 Å. Both Eu(1)-Ga(3) bond lengths are 3.11 Å. There are a spread of Eu(1)-Ga(4) bond distances ranging from 3.22-3.42 Å. There are a spread of Eu(1)-Ga(2) bond distances ranging from 3.14-3.41 Å. In the second Eu site, Eu(2) is bonded in a 11-coordinate geometry to one Ga(2), two equivalent Ga(4), two equivalent Ga(5), three equivalent Ga(1), and three equivalent Ga(3) atoms. The Eu(2)-Ga(2) bond length is 3.29 Å. Both Eu(2)-Ga(4) bond lengths are 3.14 Å. Both Eu(2)-Ga(5) bond lengths are 3.24 Å. There are two shorter (3.16 Å) and one longer (3.23 Å) Eu(2)-Ga(1) bond length. There is one shorter (3.33 Å) and two longer (3.41 Å) Eu(2)-Ga(3) bond lengths. In the third Eu site, Eu(3) is bonded in a 9-coordinate geometry to two equivalent Ga(3), three equivalent Ga(5), and four equivalent Ga(1) atoms. Both Eu(3)-Ga(3) bond lengths are 3.25 Å. There is one shorter (3.17 Å) and two longer (3.19 Å) Eu(3)-Ga(5) bond lengths. All Eu(3)-Ga(1) bond lengths are 3.36 Å. There are five inequivalent Ga sites. In the first Ga site, Ga(4) is bonded in a 10-coordinate geometry to two equivalent Eu(2), four equivalent Eu(1), one Ga(1), one Ga(3), and two equivalent Ga(2) atoms. The Ga(4)-Ga(1) bond length is 2.77 Å. The Ga(4)-Ga(3) bond length is 2.66 Å. Both Ga(4)-Ga(2) bond lengths are 2.67 Å. In the second Ga site, Ga(5) is bonded in a 9-coordinate geometry to three equivalent Eu(3), four equivalent Eu(2), and two equivalent Ga(1) atoms. Both Ga(5)-Ga(1) bond lengths are 2.64 Å. In the third Ga site, Ga(1) is bonded in a 10-coordinate geometry to one Eu(1), two equivalent Eu(3), three equivalent Eu(2), one Ga(4), one Ga(5), and two equivalent Ga(3) atoms. Both Ga(1)-Ga(3) bond lengths are 2.67 Å. In the fourth Ga site, Ga(2) is bonded in a 10-coordinate geometry to one Eu(2), five equivalent Eu(1), one Ga(2), one Ga(3), and two equivalent Ga(4) atoms. The Ga(2)-Ga(2) bond length is 2.62 Å. The Ga(2)-Ga(3) bond length is 2.76 Å. In the fifth Ga site, Ga(3) is bonded in a 10-coordinate geometry to one Eu(3), two equivalent Eu(1), three equivalent Eu(2), one Ga(2), one Ga(4), and two equivalent Ga(1) atoms.