Abstract

Fe 2P 2O 7 crystallizes in the C 1 space group with lattice parameters a = 6.649(2)Å, b = 8.484(2)Å, c = 4.488(1)Å, α = 90.04°, β = 103.89(3)°, γ = 92.82(3)°, and ϱ cal = 3.86 g/cc. It is essentially isostructural with β-Zn 2P 2O 7. As in the Zn compound, the bridging oxygen atom in the P 2O 7 group shows a high anisotropic thermal motion. It appears that the P-O-P bond angle is linear as a result of extensive π bonding with the p orbitals on the bridging oxygen atom. The high thermal motion is vibration of the atom into cavities in the structure.

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