FeAlB2(PbO4)2 crystallizes in the monoclinic P2_1/c space group. Fe(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms to form FeO6 octahedra that share edges with two equivalent Al(1)O6 octahedra. Al(1) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms to form AlO6 octahedra that share edges with two equivalent Fe(1)O6 octahedra. B(1) is bonded in a trigonal planar geometry to one O(1), one O(2), and one O(3) atom. Pb(1) is bonded in a 4-coordinate geometry to one O(2), one O(3), and two equivalent O(4) atoms. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Fe(1), one Al(1), and one B(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Fe(1), one B(1), and one Pb(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Al(1), one B(1), and one Pb(1) atom. In the fourth O site, O(4) is bonded to one Fe(1), one Al(1), and two equivalent Pb(1) atoms to form distorted corner-sharing OAlFePb2 tetrahedra.
FeAlB2(PbO4)2 crystallizes in the monoclinic P2_1/c space group. Fe(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms to form FeO6 octahedra that share edges with two equivalent Al(1)O6 octahedra. Both Fe(1)-O(1) bond lengths are 2.13 Å. Both Fe(1)-O(2) bond lengths are 2.04 Å. Both Fe(1)-O(4) bond lengths are 1.95 Å. Al(1) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms to form AlO6 octahedra that share edges with two equivalent Fe(1)O6 octahedra. Both Al(1)-O(1) bond lengths are 2.04 Å. Both Al(1)-O(3) bond lengths are 2.00 Å. Both Al(1)-O(4) bond lengths are 1.84 Å. B(1) is bonded in a trigonal planar geometry to one O(1), one O(2), and one O(3) atom. The B(1)-O(1) bond length is 1.39 Å. The B(1)-O(2) bond length is 1.39 Å. The B(1)-O(3) bond length is 1.39 Å. Pb(1) is bonded in a 4-coordinate geometry to one O(2), one O(3), and two equivalent O(4) atoms. The Pb(1)-O(2) bond length is 2.37 Å. The Pb(1)-O(3) bond length is 2.40 Å. There is one shorter (2.35 Å) and one longer (2.39 Å) Pb(1)-O(4) bond length. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Fe(1), one Al(1), and one B(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Fe(1), one B(1), and one Pb(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Al(1), one B(1), and one Pb(1) atom. In the fourth O site, O(4) is bonded to one Fe(1), one Al(1), and two equivalent Pb(1) atoms to form distorted corner-sharing OAlFePb2 tetrahedra.