MgEuGa3 crystallizes in the tetragonal I-4m2 space group. Mg(1) is bonded in a 8-coordinate geometry to four equivalent Eu(1), four equivalent Ga(1), and four equivalent Ga(2) atoms. Eu(1) is bonded in a 16-coordinate geometry to four equivalent Mg(1), four equivalent Ga(2), and eight equivalent Ga(1) atoms. There are two inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a 9-coordinate geometry to two equivalent Mg(1), four equivalent Eu(1), one Ga(1), and two equivalent Ga(2) atoms. In the second Ga site, Ga(2) is bonded to four equivalent Mg(1), four equivalent Eu(1), and four equivalent Ga(1) atoms to form a mixture of face and corner-sharing GaEu4Mg4Ga4 cuboctahedra.
MgEuGa3 crystallizes in the tetragonal I-4m2 space group. Mg(1) is bonded in a 8-coordinate geometry to four equivalent Eu(1), four equivalent Ga(1), and four equivalent Ga(2) atoms. All Mg(1)-Eu(1) bond lengths are 3.56 Å. All Mg(1)-Ga(1) bond lengths are 2.68 Å. All Mg(1)-Ga(2) bond lengths are 3.05 Å. Eu(1) is bonded in a 16-coordinate geometry to four equivalent Mg(1), four equivalent Ga(2), and eight equivalent Ga(1) atoms. All Eu(1)-Ga(2) bond lengths are 3.56 Å. All Eu(1)-Ga(1) bond lengths are 3.29 Å. There are two inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a 9-coordinate geometry to two equivalent Mg(1), four equivalent Eu(1), one Ga(1), and two equivalent Ga(2) atoms. The Ga(1)-Ga(1) bond length is 2.48 Å. Both Ga(1)-Ga(2) bond lengths are 2.68 Å. In the second Ga site, Ga(2) is bonded to four equivalent Mg(1), four equivalent Eu(1), and four equivalent Ga(1) atoms to form a mixture of face and corner-sharing GaEu4Mg4Ga4 cuboctahedra.