Materials Data on Ba4Y(CuO3)3 by Materials Project
YBa4Cu3O9 crystallizes in the cubic Pm-3 space group. The structure is three-dimensional. Ba2+ is bonded in a distorted q6 geometry to nine O2- atoms. There are a spread of Ba–O bond distances ranging from 2.88–2.90 Å. There are two inequivalent Y3+ sites. In the first Y3+ site, Y3+ is bonded in an octahedral geometry to six equivalent O2- atoms. All Y–O bond lengths are 2.23 Å. In the second Y3+ site, Y3+ is bonded in an octahedral geometry to six equivalent O2- atoms. All Y–O bond lengths are 2.23 Å. There are two inequivalent Cu+2.33+ sites. In the first Cu+2.33+ site, Cu+2.33+ is bonded in a square co-planar geometry to four O2- atoms. There is two shorter (1.85 Å) and two longer (1.99 Å) Cu–O bond length. In the second Cu+2.33+ site, Cu+2.33+ is bonded in a square co-planar geometry to four O2- atoms. There is two shorter (1.85 Å) and two longer (2.09 Å) Cu–O bond length. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted linear geometry to four equivalent Ba2+, one Y3+, and one Cu+2.33+ atom. In the second O2- site, O2- is bonded in a distorted linear geometry to four equivalent Ba2+, one Y3+, and one Cu+2.33+ atom. In the third O2- site, O2- is bonded to four equivalent Ba2+ and two Cu+2.33+ atoms to form distorted corner-sharing OBa4Cu2 octahedra. The corner-sharing octahedra tilt angles range from 0–60°.