Materials Data on Bi3Se4 by Materials Project
Bi3Se4 is MAX Phase-derived structured and crystallizes in the trigonal R-3m space group. The structure is two-dimensional and consists of three Bi3Se4 sheets oriented in the (0, 0, 1) direction. there are two inequivalent Bi+2.67+ sites. In the first Bi+2.67+ site, Bi+2.67+ is bonded to six equivalent Se2- atoms to form a mixture of edge and corner-sharing BiSe6 octahedra. The corner-sharing octahedral tilt angles are 5°. All Bi–Se bond lengths are 3.01 Å. In the second Bi+2.67+ site, Bi+2.67+ is bonded to six Se2- atoms to form a mixture of edge and corner-sharing BiSe6 octahedra. The corner-sharing octahedral tilt angles are 5°. There are three shorter (2.87 Å) and three longer (3.22 Å) Bi–Se bond lengths. There are two inequivalent Se2- sites. In the first Se2- site, Se2- is bonded to six Bi+2.67+ atoms to form a mixture of edge and corner-sharing SeBi6 octahedra. The corner-sharing octahedral tilt angles are 0°. In the second Se2- site, Se2- is bonded in a 3-coordinate geometry to three equivalent Bi+2.67+ atoms.