Mobility transition of solid rare gases in confined environments.
We report the results of x-ray diffraction and small angle scattering studies of Ar and Kr confined in sol-gel and Vycor glasses. The confined liquid crystallizes in a disordered hcp structure on freezing. Upon further cooling a sharp transition occurs at a reduced temperature of T/T(m) approximately 0.65, where the crystalline structure disappears and the total scattering decreases. This behavior marks the onset of a well-defined mobility transition, where the confined sample migrates out of the pore space.
Silva
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DE
Department of Physics, The Pennsylvania State University, University Park, Pennsylvania 16802, USA.
Sokol
P E
PE
Ehrlich
S N
SN