YPtAs crystallizes in the hexagonal P6_3/mmc space group. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded to six equivalent Pt(1) and six equivalent As(1) atoms to form a mixture of edge and face-sharing YAs6Pt6 cuboctahedra. In the second Y site, Y(2) is bonded to six equivalent Pt(1) and six equivalent As(1) atoms to form a mixture of distorted edge and face-sharing YAs6Pt6 cuboctahedra. Pt(1) is bonded in a 9-coordinate geometry to three equivalent Y(1), three equivalent Y(2), and three equivalent As(1) atoms. As(1) is bonded in a 9-coordinate geometry to three equivalent Y(1), three equivalent Y(2), and three equivalent Pt(1) atoms.
YPtAs crystallizes in the hexagonal P6_3/mmc space group. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded to six equivalent Pt(1) and six equivalent As(1) atoms to form a mixture of edge and face-sharing YAs6Pt6 cuboctahedra. All Y(1)-Pt(1) bond lengths are 3.22 Å. All Y(1)-As(1) bond lengths are 3.05 Å. In the second Y site, Y(2) is bonded to six equivalent Pt(1) and six equivalent As(1) atoms to form a mixture of distorted edge and face-sharing YAs6Pt6 cuboctahedra. All Y(2)-Pt(1) bond lengths are 3.04 Å. All Y(2)-As(1) bond lengths are 3.21 Å. Pt(1) is bonded in a 9-coordinate geometry to three equivalent Y(1), three equivalent Y(2), and three equivalent As(1) atoms. All Pt(1)-As(1) bond lengths are 2.48 Å. As(1) is bonded in a 9-coordinate geometry to three equivalent Y(1), three equivalent Y(2), and three equivalent Pt(1) atoms.