EuZrSe3 crystallizes in the orthorhombic Pnma space group. Eu(1) is bonded in a 8-coordinate geometry to one Se(1), three equivalent Se(2), and four equivalent Se(3) atoms. Zr(1) is bonded to one Se(3), two equivalent Se(2), and three equivalent Se(1) atoms to form edge-sharing ZrSe6 octahedra. There are three inequivalent Se sites. In the first Se site, Se(1) is bonded in a distorted rectangular see-saw-like geometry to one Eu(1) and three equivalent Zr(1) atoms. In the second Se site, Se(2) is bonded in a 5-coordinate geometry to three equivalent Eu(1) and two equivalent Zr(1) atoms. In the third Se site, Se(3) is bonded to four equivalent Eu(1) and one Zr(1) atom to form a mixture of distorted corner and edge-sharing SeEu4Zr square pyramids.
EuZrSe3 crystallizes in the orthorhombic Pnma space group. Eu(1) is bonded in a 8-coordinate geometry to one Se(1), three equivalent Se(2), and four equivalent Se(3) atoms. The Eu(1)-Se(1) bond length is 3.16 Å. There are two shorter (3.20 Å) and one longer (3.40 Å) Eu(1)-Se(2) bond length. There are two shorter (3.17 Å) and two longer (3.22 Å) Eu(1)-Se(3) bond lengths. Zr(1) is bonded to one Se(3), two equivalent Se(2), and three equivalent Se(1) atoms to form edge-sharing ZrSe6 octahedra. The Zr(1)-Se(3) bond length is 2.62 Å. Both Zr(1)-Se(2) bond lengths are 2.72 Å. There are two shorter (2.73 Å) and one longer (2.75 Å) Zr(1)-Se(1) bond length. There are three inequivalent Se sites. In the first Se site, Se(1) is bonded in a distorted rectangular see-saw-like geometry to one Eu(1) and three equivalent Zr(1) atoms. In the second Se site, Se(2) is bonded in a 5-coordinate geometry to three equivalent Eu(1) and two equivalent Zr(1) atoms. In the third Se site, Se(3) is bonded to four equivalent Eu(1) and one Zr(1) atom to form a mixture of distorted corner and edge-sharing SeEu4Zr square pyramids.