Ca2Bi crystallizes in the tetragonal I4/mmm space group. There are two inequivalent Ca sites. In the first Ca site, Ca(1) is bonded to five equivalent Bi(1) atoms to form a mixture of distorted corner and edge-sharing CaBi5 square pyramids. In the second Ca site, Ca(2) is bonded in a distorted square co-planar geometry to four equivalent Bi(1) atoms. Bi(1) is bonded in a 9-coordinate geometry to four equivalent Ca(2) and five equivalent Ca(1) atoms.
Ca2Bi crystallizes in the tetragonal I4/mmm space group. There are two inequivalent Ca sites. In the first Ca site, Ca(1) is bonded to five equivalent Bi(1) atoms to form a mixture of distorted corner and edge-sharing CaBi5 square pyramids. There is one shorter (3.23 Å) and four longer (3.49 Å) Ca(1)-Bi(1) bond lengths. In the second Ca site, Ca(2) is bonded in a distorted square co-planar geometry to four equivalent Bi(1) atoms. All Ca(2)-Bi(1) bond lengths are 3.36 Å. Bi(1) is bonded in a 9-coordinate geometry to four equivalent Ca(2) and five equivalent Ca(1) atoms.