Materials Data on K2Ge2Pb2O7 by Materials Project
K2Pb2Ge2O7 crystallizes in the trigonal P-3 space group. The structure is three-dimensional. K1+ is bonded in a 9-coordinate geometry to nine equivalent O2- atoms. There are a spread of K–O bond distances ranging from 2.91–3.21 Å. Pb2+ is bonded in a distorted T-shaped geometry to three equivalent O2- atoms. All Pb–O bond lengths are 2.22 Å. Ge4+ is bonded to four O2- atoms to form corner-sharing GeO4 tetrahedra. There is three shorter (1.77 Å) and one longer (1.81 Å) Ge–O bond length. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a 1-coordinate geometry to three equivalent K1+, one Pb2+, and one Ge4+ atom. In the second O2- site, O2- is bonded in a linear geometry to two equivalent Ge4+ atoms.
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