Eu2Cu4GeSi3 crystallizes in the tetragonal P4mm space group. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a 16-coordinate geometry to four equivalent Cu(1), four equivalent Cu(2), four equivalent Ge(1), and four equivalent Si(3) atoms. In the second Eu site, Eu(2) is bonded in a 16-coordinate geometry to four equivalent Cu(1), four equivalent Cu(2), four equivalent Si(1), and four equivalent Si(2) atoms. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a 12-coordinate geometry to two equivalent Eu(1), two equivalent Eu(2), four equivalent Cu(1), two equivalent Ge(1), and two equivalent Si(2) atoms. In the second Cu site, Cu(2) is bonded in a 8-coordinate geometry to two equivalent Eu(1), two equivalent Eu(2), two equivalent Si(1), and two equivalent Si(3) atoms. Ge(1) is bonded in a 9-coordinate geometry to four equivalent Eu(1), four equivalent Cu(1), and one Si(3) atom. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to four equivalent Eu(2), four equivalent Cu(2), and one Si(2) atom. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to four equivalent Eu(2), four equivalent Cu(1), and one Si(1) atom. In the third Si site, Si(3) is bonded in a 9-coordinate geometry to four equivalent Eu(1), four equivalent Cu(2), and one Ge(1) atom.
Eu2Cu4GeSi3 crystallizes in the tetragonal P4mm space group. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a 16-coordinate geometry to four equivalent Cu(1), four equivalent Cu(2), four equivalent Ge(1), and four equivalent Si(3) atoms. All Eu(1)-Cu(1) bond lengths are 3.30 Å. All Eu(1)-Cu(2) bond lengths are 3.22 Å. All Eu(1)-Ge(1) bond lengths are 3.17 Å. All Eu(1)-Si(3) bond lengths are 3.18 Å. In the second Eu site, Eu(2) is bonded in a 16-coordinate geometry to four equivalent Cu(1), four equivalent Cu(2), four equivalent Si(1), and four equivalent Si(2) atoms. All Eu(2)-Cu(1) bond lengths are 3.19 Å. All Eu(2)-Cu(2) bond lengths are 3.21 Å. All Eu(2)-Si(1) bond lengths are 3.16 Å. All Eu(2)-Si(2) bond lengths are 3.17 Å. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a 12-coordinate geometry to two equivalent Eu(1), two equivalent Eu(2), four equivalent Cu(1), two equivalent Ge(1), and two equivalent Si(2) atoms. All Cu(1)-Cu(1) bond lengths are 2.93 Å. Both Cu(1)-Ge(1) bond lengths are 2.48 Å. Both Cu(1)-Si(2) bond lengths are 2.40 Å. In the second Cu site, Cu(2) is bonded in a 8-coordinate geometry to two equivalent Eu(1), two equivalent Eu(2), two equivalent Si(1), and two equivalent Si(3) atoms. Both Cu(2)-Si(1) bond lengths are 2.43 Å. Both Cu(2)-Si(3) bond lengths are 2.40 Å. Ge(1) is bonded in a 9-coordinate geometry to four equivalent Eu(1), four equivalent Cu(1), and one Si(3) atom. The Ge(1)-Si(3) bond length is 2.45 Å. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to four equivalent Eu(2), four equivalent Cu(2), and one Si(2) atom. The Si(1)-Si(2) bond length is 2.39 Å. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to four equivalent Eu(2), four equivalent Cu(1), and one Si(1) atom. In the third Si site, Si(3) is bonded in a 9-coordinate geometry to four equivalent Eu(1), four equivalent Cu(2), and one Ge(1) atom.