Structural study on molten MOD (M=7Li, Na and K) by pulsed neutron diffraction

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Abstract
The structure of molten MOD (M=7Li, Na and K) at 773 K has been investigated by neutron diffraction measurement using a nickel metal cell. The intraionic O-D bond lengths were 97, 98 and 98 pm and the most probable interionic M-O distances were 194, 242 and 279 pm for 7LiOD, NaOD and KOD, respectively. The difference in the intraionic O-D distance among these melts was within the experimental error. The M-O distance depends linearly on the ionic radius of the cations; the OD- ion possesses an effective ionic radius of 139 pm in the melts. Long ranged oscillatory character was observed in the Gn(r) for 7LiOD but not for NaOD or KOD.