EuCo2Ga3 crystallizes in the orthorhombic Cmcm space group. Eu(1) is bonded in a 21-coordinate geometry to two equivalent Eu(1), eight equivalent Co(1), three equivalent Ga(2), and eight equivalent Ga(1) atoms. Co(1) is bonded in a 6-coordinate geometry to four equivalent Eu(1), two equivalent Ga(2), and four equivalent Ga(1) atoms. There are two inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a 11-coordinate geometry to four equivalent Eu(1), four equivalent Co(1), one Ga(2), and two equivalent Ga(1) atoms. In the second Ga site, Ga(2) is bonded in a 11-coordinate geometry to three equivalent Eu(1), four equivalent Co(1), two equivalent Ga(1), and two equivalent Ga(2) atoms.
EuCo2Ga3 crystallizes in the orthorhombic Cmcm space group. Eu(1) is bonded in a 21-coordinate geometry to two equivalent Eu(1), eight equivalent Co(1), three equivalent Ga(2), and eight equivalent Ga(1) atoms. Both Eu(1)-Eu(1) bond lengths are 3.50 Å. There are four shorter (3.45 Å) and four longer (3.54 Å) Eu(1)-Co(1) bond lengths. There is one shorter (3.06 Å) and two longer (3.41 Å) Eu(1)-Ga(2) bond lengths. There are a spread of Eu(1)-Ga(1) bond distances ranging from 3.14-3.46 Å. Co(1) is bonded in a 6-coordinate geometry to four equivalent Eu(1), two equivalent Ga(2), and four equivalent Ga(1) atoms. Both Co(1)-Ga(2) bond lengths are 2.41 Å. There are two shorter (2.36 Å) and two longer (2.48 Å) Co(1)-Ga(1) bond lengths. There are two inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a 11-coordinate geometry to four equivalent Eu(1), four equivalent Co(1), one Ga(2), and two equivalent Ga(1) atoms. The Ga(1)-Ga(2) bond length is 2.58 Å. Both Ga(1)-Ga(1) bond lengths are 2.84 Å. In the second Ga site, Ga(2) is bonded in a 11-coordinate geometry to three equivalent Eu(1), four equivalent Co(1), two equivalent Ga(1), and two equivalent Ga(2) atoms. Both Ga(2)-Ga(2) bond lengths are 2.75 Å.