Er2Pt is Cotunnite structured and crystallizes in the orthorhombic Pnma space group. There are two inequivalent Er sites. In the first Er site, Er(1) is bonded to four equivalent Pt(1) atoms to form a mixture of corner and edge-sharing ErPt4 tetrahedra. In the second Er site, Er(2) is bonded in a 3-coordinate geometry to three equivalent Pt(1) atoms. Pt(1) is bonded in a 7-coordinate geometry to three equivalent Er(2) and four equivalent Er(1) atoms.
Er2Pt is Cotunnite structured and crystallizes in the orthorhombic Pnma space group. There are two inequivalent Er sites. In the first Er site, Er(1) is bonded to four equivalent Pt(1) atoms to form a mixture of corner and edge-sharing ErPt4 tetrahedra. There are a spread of Er(1)-Pt(1) bond distances ranging from 2.83-2.92 Å. In the second Er site, Er(2) is bonded in a 3-coordinate geometry to three equivalent Pt(1) atoms. There is one shorter (2.78 Å) and two longer (3.01 Å) Er(2)-Pt(1) bond lengths. Pt(1) is bonded in a 7-coordinate geometry to three equivalent Er(2) and four equivalent Er(1) atoms.