Materials Data on Bi2S2O by Materials Project
Bi2OS2 crystallizes in the tetragonal P4/nmm space group. The structure is two-dimensional and consists of one BiO sheet oriented in the (0, 0, 1) direction and one BiS2 sheet oriented in the (0, 0, 1) direction. In the BiO sheet, Bi3+ is bonded in a 4-coordinate geometry to four equivalent O2- atoms. All Bi–O bond lengths are 2.36 Å. O2- is bonded to four equivalent Bi3+ atoms to form a mixture of edge and corner-sharing OBi4 tetrahedra. In the BiS2 sheet, Bi3+ is bonded to six S2- atoms to form a mixture of distorted edge and corner-sharing BiS6 octahedra. The corner-sharing octahedral tilt angles are 16°. There are a spread of Bi–S bond distances ranging from 2.54–3.41 Å. There are two inequivalent S2- sites. In the first S2- site, S2- is bonded to five equivalent Bi3+ atoms to form a mixture of distorted edge and corner-sharing SBi5 square pyramids. In the second S2- site, S2- is bonded in a distorted single-bond geometry to one Bi3+ atom.