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RbAlO2 crystallizes in the cubic Fd-3m space group. The structure is three-dimensional. Rb1+ is bonded in a 12-coordinate geometry to twelve equivalent O2- atoms. All Rb–O bond lengths are 3.36 Å. Al3+ is bonded to four equivalent O2- atoms to form corner-sharing AlO4 tetrahedra. All Al–O bond lengths are 1.76 Å. O2- is bonded in a linear geometry to six equivalent Rb1+ and two equivalent Al3+ atoms.
Rb3AlO3 crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. there are three inequivalent Rb1+ sites. In the first Rb1+ site, Rb1+ is bonded in a 1-coordinate geometry to five O2- atoms. There are a spread of Rb–O bond distances ranging from 2.75–3.00 Å. In the second Rb1+ site, Rb1+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Rb–O bond distances ranging from 2.87–3.40 Å. In the third Rb1+ site, Rb1+ is bonded to four equivalent O2- atoms to form distorted RbO4 tetrahedra that share corners with four equivalent AlO4 tetrahedra and edges with two equivalent RbO4 tetrahedra. There are two shorter (2.85 Å) and two longer (3.02 Å) Rb–O bond lengths. Al3+ is bonded to four O2- atoms to form AlO4 tetrahedra that share corners with four equivalent RbO4 tetrahedra and an edgeedge with one AlO4 tetrahedra. There are a spread of Al–O bond distances ranging from 1.78–1.86 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to six Rb1+ and one Al3+ atom. In the second O2- site, O2- is bonded in a 2-coordinate geometry to three Rb1+ and two equivalent Al3+ atoms.
RbAl11O17 crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Rb1+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are six shorter (2.93 Å) and three longer (3.26 Å) Rb–O bond lengths. There are four inequivalent Al3+ sites. In the first Al3+ site, Al3+ is bonded to six O2- atoms to form AlO6 octahedra that share corners with five AlO4 tetrahedra and edges with five AlO6 octahedra. There are a spread of Al–O bond distances ranging from 1.82–2.05 Å. In the second Al3+ site, Al3+ is bonded to four O2- atoms to form AlO4 tetrahedra that share corners with six equivalent AlO6 octahedra and a cornercorner with one AlO4 tetrahedra. The corner-sharing octahedral tilt angles are 54°. There is one shorter (1.73 Å) and three longer (1.80 Å) Al–O bond length. In the third Al3+ site, Al3+ is bonded to four O2- atoms to form corner-sharing AlO4 tetrahedra. The corner-sharing octahedra tilt angles range from 54–58°. There is three shorter (1.82 Å) and one longer (1.84 Å) Al–O bond length. In the fourth Al3+ site, Al3+ is bonded to six equivalent O2- atoms to form AlO6 octahedra that share corners with six equivalent AlO4 tetrahedra and edges with six equivalent AlO6 octahedra. All Al–O bond lengths are 1.91 Å. There are five inequivalent O2- sites. In the first O2- site, O2- is bonded in a rectangular see-saw-like geometry to four Al3+ atoms. In the second O2- site, O2- is bonded in a 3-coordinate geometry to one Rb1+ and three Al3+ atoms. In the third O2- site, O2- is bonded in a linear geometry to three equivalent Rb1+ and two equivalent Al3+ atoms. In the fourth O2- site, O2- is bonded in a trigonal non-coplanar geometry to three equivalent Al3+ atoms. In the fifth O2- site, O2- is bonded in a rectangular see-saw-like geometry to four Al3+ atoms.