YAgSe2 crystallizes in the orthorhombic P2_12_12_1 space group. Y(1) is bonded to three equivalent Se(1) and three equivalent Se(2) atoms to form a mixture of corner and edge-sharing YSe6 octahedra. The corner-sharing octahedral tilt angles range from 44-51°. Ag(1) is bonded in a 4-coordinate geometry to two equivalent Se(1) and two equivalent Se(2) atoms. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded to three equivalent Y(1) and two equivalent Ag(1) atoms to form a mixture of distorted corner and edge-sharing SeY3Ag2 trigonal bipyramids. In the second Se site, Se(2) is bonded to three equivalent Y(1) and two equivalent Ag(1) atoms to form a mixture of distorted corner and edge-sharing SeY3Ag2 trigonal bipyramids.
YAgSe2 crystallizes in the orthorhombic P2_12_12_1 space group. Y(1) is bonded to three equivalent Se(1) and three equivalent Se(2) atoms to form a mixture of corner and edge-sharing YSe6 octahedra. The corner-sharing octahedral tilt angles range from 44-51°. There are a spread of Y(1)-Se(1) bond distances ranging from 2.86-2.89 Å. There are a spread of Y(1)-Se(2) bond distances ranging from 2.86-2.89 Å. Ag(1) is bonded in a 4-coordinate geometry to two equivalent Se(1) and two equivalent Se(2) atoms. There is one shorter (2.71 Å) and one longer (2.72 Å) Ag(1)-Se(1) bond length. Both Ag(1)-Se(2) bond lengths are 2.73 Å. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded to three equivalent Y(1) and two equivalent Ag(1) atoms to form a mixture of distorted corner and edge-sharing SeY3Ag2 trigonal bipyramids. In the second Se site, Se(2) is bonded to three equivalent Y(1) and two equivalent Ag(1) atoms to form a mixture of distorted corner and edge-sharing SeY3Ag2 trigonal bipyramids.