Materials Data on GdMnGe2O7 by Materials Project
GdMnGe2O7 crystallizes in the orthorhombic C222 space group. The structure is three-dimensional. there are two inequivalent Gd3+ sites. In the first Gd3+ site, Gd3+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are four shorter (2.38 Å) and four longer (2.44 Å) Gd–O bond lengths. In the second Gd3+ site, Gd3+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are four shorter (2.38 Å) and four longer (2.44 Å) Gd–O bond lengths. Mn3+ is bonded to six O2- atoms to form distorted MnO6 octahedra that share corners with two equivalent MnO6 octahedra and corners with eight equivalent GeO4 tetrahedra. The corner-sharing octahedral tilt angles are 74°. There are four shorter (1.95 Å) and two longer (2.50 Å) Mn–O bond lengths. Ge4+ is bonded to four O2- atoms to form GeO4 tetrahedra that share corners with four equivalent MnO6 octahedra and a cornercorner with one GeO4 tetrahedra. The corner-sharing octahedra tilt angles range from 48–71°. There are a spread of Ge–O bond distances ranging from 1.75–1.84 Å. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded to two equivalent Mn3+ and two equivalent Ge4+ atoms to form distorted corner-sharing OMn2Ge2 tetrahedra. In the second O2- site, O2- is bonded in a 3-coordinate geometry to one Gd3+, one Mn3+, and one Ge4+ atom. In the third O2- site, O2- is bonded in a distorted trigonal planar geometry to two Gd3+ and one Ge4+ atom. In the fourth O2- site, O2- is bonded in a 3-coordinate geometry to one Gd3+, one Mn3+, and one Ge4+ atom.