Crystal-Structure Changes in Hydrogen and Deuterium
A. F. SchuchLos Alamos Scientific Laboratory, University of California, Los Alamos, New MexicoR. L. MillsLos Alamos Scientific Laboratory, University of California, Los Alamos, New MexicoD. DepatieLos Alamos Scientific Laboratory, University of California, Los Alamos, New Mexico
1968en
ABI
Annotatsiya
The hexagonal-to-cubic-to-hexagonal structure changes in hydrogen and deuterium were studied by x-ray diffraction over many cycles of the transitions for orthohydrogen and paradeuterium concentrations up to 95%. Results of the x-ray study can be closely correlated with those of infrared, neutron-diffraction, heat-capacity, nuclear-magnetic-resonance, and volume-change measurements. The structure changes take place by a shifting of the hexagonal nets, which appears to be incomplete after the first transition and may cause intermediate close-packed structures to form. Repeated cylcing through the transition stabilizes the cubic structure, possibly because orientation of the $J=0$ molecules takes place.
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