Materials Data on Ba2SrB18 by Materials Project
Ba2SrB18 is Calcium hexaboride-derived structured and crystallizes in the tetragonal P4/mmm space group. The structure is three-dimensional. Ba2+ is bonded in a 8-coordinate geometry to twenty-four B+0.33- atoms. There are sixteen shorter (3.13 Å) and eight longer (3.14 Å) Ba–B bond lengths. Sr2+ is bonded in a 1-coordinate geometry to twenty-four B+0.33- atoms. There are sixteen shorter (3.12 Å) and eight longer (3.13 Å) Sr–B bond lengths. There are five inequivalent B+0.33- sites. In the first B+0.33- site, B+0.33- is bonded in a 1-coordinate geometry to two equivalent Ba2+, two equivalent Sr2+, and five B+0.33- atoms. There is one shorter (1.74 Å) and four longer (1.78 Å) B–B bond length. In the second B+0.33- site, B+0.33- is bonded in a 1-coordinate geometry to four equivalent Ba2+ and five B+0.33- atoms. There is one shorter (1.74 Å) and four longer (1.78 Å) B–B bond length. In the third B+0.33- site, B+0.33- is bonded in a 1-coordinate geometry to four equivalent Ba2+ and five B+0.33- atoms. The B–B bond length is 1.75 Å. In the fourth B+0.33- site, B+0.33- is bonded in a 1-coordinate geometry to four equivalent Ba2+ and five B+0.33- atoms. In the fifth B+0.33- site, B+0.33- is bonded in a 1-coordinate geometry to four equivalent Sr2+ and five B+0.33- atoms. The B–B bond length is 1.72 Å.