Ag3Se is Uranium Silicide-like structured and crystallizes in the hexagonal P6_3/mmc space group. There are three inequivalent Ag sites. In the first Ag site, Ag(1) is bonded to eight Ag(1,1,1) and four equivalent Se(1) atoms to form distorted AgAg8Se4 cuboctahedra that share corners with four equivalent Se(1)Ag12 cuboctahedra; corners with fourteen Ag(1,1)Ag8Se4 cuboctahedra; edges with six equivalent Se(1)Ag12 cuboctahedra; edges with twelve Ag(1,1,1)Ag8Se4 cuboctahedra; faces with four equivalent Se(1)Ag12 cuboctahedra; and faces with sixteen Ag(1,1,1)Ag8Se4 cuboctahedra. In the second Ag site, Ag(1) is bonded to eight equivalent Ag(1) and four equivalent Se(1) atoms to form distorted AgAg8Se4 cuboctahedra that share corners with four equivalent Se(1)Ag12 cuboctahedra; corners with fourteen Ag(1,1)Ag8Se4 cuboctahedra; edges with six equivalent Se(1)Ag12 cuboctahedra; edges with twelve equivalent Ag(1)Ag8Se4 cuboctahedra; faces with four equivalent Se(1)Ag12 cuboctahedra; and faces with sixteen Ag(1,1,1)Ag8Se4 cuboctahedra. In the third Ag site, Ag(1) is bonded to eight equivalent Ag(1) and four equivalent Se(1) atoms to form distorted AgAg8Se4 cuboctahedra that share corners with four equivalent Se(1)Ag12 cuboctahedra; corners with fourteen Ag(1,1)Ag8Se4 cuboctahedra; edges with six equivalent Se(1)Ag12 cuboctahedra; edges with twelve equivalent Ag(1)Ag8Se4 cuboctahedra; faces with four equivalent Se(1)Ag12 cuboctahedra; and faces with sixteen Ag(1,1,1)Ag8Se4 cuboctahedra. Se(1) is bonded to twelve Ag(1,1,1) atoms to form SeAg12 cuboctahedra that share corners with six equivalent Se(1)Ag12 cuboctahedra; corners with twelve Ag(1,1)Ag8Se4 cuboctahedra; edges with eighteen Ag(1,1,1)Ag8Se4 cuboctahedra; faces with eight equivalent Se(1)Ag12 cuboctahedra; and faces with twelve Ag(1,1,1)Ag8Se4 cuboctahedra.
Ag3Se is Uranium Silicide-like structured and crystallizes in the hexagonal P6_3/mmc space group. There are three inequivalent Ag sites. In the first Ag site, Ag(1) is bonded to eight Ag(1,1,1) and four equivalent Se(1) atoms to form distorted AgAg8Se4 cuboctahedra that share corners with four equivalent Se(1)Ag12 cuboctahedra; corners with fourteen Ag(1,1)Ag8Se4 cuboctahedra; edges with six equivalent Se(1)Ag12 cuboctahedra; edges with twelve Ag(1,1,1)Ag8Se4 cuboctahedra; faces with four equivalent Se(1)Ag12 cuboctahedra; and faces with sixteen Ag(1,1,1)Ag8Se4 cuboctahedra. There are a spread of Ag(1)-Ag(1,1,1) bond distances ranging from 2.94-3.09 Å. All Ag(1)-Se(1) bond lengths are 3.01 Å. In the second Ag site, Ag(1) is bonded to eight equivalent Ag(1) and four equivalent Se(1) atoms to form distorted AgAg8Se4 cuboctahedra that share corners with four equivalent Se(1)Ag12 cuboctahedra; corners with fourteen Ag(1,1)Ag8Se4 cuboctahedra; edges with six equivalent Se(1)Ag12 cuboctahedra; edges with twelve equivalent Ag(1)Ag8Se4 cuboctahedra; faces with four equivalent Se(1)Ag12 cuboctahedra; and faces with sixteen Ag(1,1,1)Ag8Se4 cuboctahedra. All Ag(1)-Se(1) bond lengths are 3.01 Å. In the third Ag site, Ag(1) is bonded to eight equivalent Ag(1) and four equivalent Se(1) atoms to form distorted AgAg8Se4 cuboctahedra that share corners with four equivalent Se(1)Ag12 cuboctahedra; corners with fourteen Ag(1,1)Ag8Se4 cuboctahedra; edges with six equivalent Se(1)Ag12 cuboctahedra; edges with twelve equivalent Ag(1)Ag8Se4 cuboctahedra; faces with four equivalent Se(1)Ag12 cuboctahedra; and faces with sixteen Ag(1,1,1)Ag8Se4 cuboctahedra. All Ag(1)-Se(1) bond lengths are 3.01 Å. Se(1) is bonded to twelve Ag(1,1,1) atoms to form SeAg12 cuboctahedra that share corners with six equivalent Se(1)Ag12 cuboctahedra; corners with twelve Ag(1,1)Ag8Se4 cuboctahedra; edges with eighteen Ag(1,1,1)Ag8Se4 cuboctahedra; faces with eight equivalent Se(1)Ag12 cuboctahedra; and faces with twelve Ag(1,1,1)Ag8Se4 cuboctahedra.