Elastic Neutron Scattering Studies of H2 and D2 Physisorbed Stage 2 Graphite-Potassium
The stage 2 MC24 (M=K,Rb,Cs) compounds exhibit low temperature physisorption for a variety of gases (H2,CH4,N2,etc.) . Physisorption of gases such as these has also been observed in the Cs-intercalated layer-chalcogenide Cs-ZrS2 . A particularly striking feature of hydrogen physisorption occuring in the GIC systems is that hydrogen isotopes are physisorbed more readily than hydrogen itself [3,4,5]. In K-graphite, to accomodate the adsorbate species within K-intercalant layers, the interlayer separation between carbon bounding layers expands by ~.30Å. This is in contrast to stage 2 Rb- and and Cs-graphite where no expansion is observed due to the larger diameter of the Cs+ and Rb+ ions.
KeywordsHydrogen Isotope Maximum Expansion Graphite Intercalation Compound Interlayer Separation High Flux Isotope Reactor
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