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• W2012184212 abstract "Volumetric adsorption and quasielastic neutron scattering are used to study the diffusion and thermodynamics of sorbed ${text{H}}_{2}$ in the graphite intercalation compound ${text{KC}}_{24}$. A sorption enthalpy of 8.5 kJ/mol at zero coverage is determined from ${text{H}}_{2}$ adsorption isotherms. From measurements of total elastic-neutron-scattering intensity as a function of temperature, a melting transition of the ${text{H}}_{2}$ adsorbate is observed at 35 K for ${text{KC}}_{24}{({text{H}}_{2})}_{1}$. Quasielastic-neutron-scattering (QENS) spectra reveal distinct slow- and fast-${text{H}}_{2}$-diffusion processes which exist simultaneously at temperatures above the transition point. The temperature dependence of the characteristic diffusion times follows an Arrhenius relation $ensuremath{tau}={ensuremath{tau}}_{0}text{ }text{exp}({E}_{a}/T)$, where ${ensuremath{tau}}_{0}^{text{fast}}=1.0ifmmodepmelsetextpmfi{}0.1text{ }text{ps}$, ${ensuremath{tau}}_{0}^{text{slow}}=21ifmmodepmelsetextpmfi{}2text{ }text{ps}$, ${E}_{a}^{text{fast}}=156ifmmodepmelsetextpmfi{}5text{ }text{K}$, and ${E}_{a}^{text{slow}}=189ifmmodepmelsetextpmfi{}5text{ }text{K}$. The fast-diffusion process is attributable to individual motions of ${text{H}}_{2}$ molecules in a static potassium structure, and the slow-diffusion process could be attributable to fluctuations in ${text{H}}_{2}$ particle density correlated with jumps of potassium atoms. The QENS spectra at low $Q$ are used to discuss the dimensionality of the diffusion process." @default.
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• W2012184212 date "2009-02-27" @default.
• W2012184212 modified "2023-10-18" @default.
• W2012184212 title "Adsorption and melting of hydrogen in potassium-intercalated graphite" @default.
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• W2012184212 doi "https://doi.org/10.1103/physrevb.79.054305" @default.
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