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- W2022900846 abstract "Neutron time-of-flight patterns at a resolution of Δd/d = 2 × 10-3 and inelastic scattering spectra at a resolution of 15 µeV have been measured for the ternary intercalation compounds which are formed when ammonia gas is absorbed at reduced pressure by stage II caesium-graphite. The diffraction patterns reveal a new staging process giving high stage ternary compounds as the first step in the reaction followed by lower stage compounds and ultimately a true second-stage ternary compound C28Cs(NH3)2·66. The rotational tunnelling spectra at the lowest ammonia concentrations (x < 1·25 in C28Cs(NH3) x ) show transitions at 126 µeV and 640 µeV, whilst the higher concentrations so far measured show a single transition at 89 µeV up to x = 1·9 when the tunnelling spectrum collapses. The two-line spectrum at low concentrations shows that half of the (on average four) NH3 ligands to each caesium ion have a much weaker V 3 hindering potential than the others (about 10/B) compared to 20/B for the 126 µeV line showing that two NH3 groups are inclined towards the graphite planes and two others lies parallel to the planes. For the filled lattice unique V 3 = 25/B means that all NH3 rotational axes are similarly inclined towards the graphite planes. There is no evidence for a change in NH3-NH3 coupling as the ammonia concentration is varied. The temperature dependence of the 126 µeV line shows a shift to higher frequencies over the whole range of temperatures where the line is observable, in contrast to the 89 µeV line. This unusual behaviour indicates a strong modulation of the hindering potential by lattice phonons through a dominant cosine form." @default.
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- W2022900846 date "1992-05-01" @default.
- W2022900846 modified "2023-10-01" @default.
- W2022900846 title "Two-dimensional caesium-ammonia solid solutions in C<sub>28</sub>Cs(NH<sub>3</sub>)<sub><i>x</i></sub>" @default.
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- W2022900846 doi "https://doi.org/10.1080/00268979200101241" @default.
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