Structure and thermal expansion in solid deuterium
P. E. SokolDepartment of Physics and Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801R. O. SimmonsDepartment of Physics and Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801J. D. JorgensenDepartment of Physics and Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801J. E. Jo rgensenDepartment of Physics and Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801
1985en
ABI
Abstract
Neutron-diffraction measurements are reported on a strain-free polycrystalline deuterium sample with a J=1 concentration x=0.46 between 0.20 and 14.0 K. The lattice remains simple hcp down to the lowest temperature studied. No new reflections or changes in diffuse scattering are observed as the sample is cooled. The molar volume has been determined from the lattice constants. Our results are consistent with measurements of ${C}_{v}$ and (\ensuremath{\partial}P/\ensuremath{\partial}T${)}_{V}$. Our diffraction data showed no evidence for a transition to a glassy phase as suggested by the NMR experiments.
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