Determination of hydrogen ordering within the (beta)-RH2+x phase (R = Ho, Y) using electron diffraction techniques

The techniques of neutron, X-ray and electron diffraction are compared with regard to their ability to detect hydrogen ordering in superstoichiometric rare earth dihydrides. To date, only neutron diffraction has been used in such studies and has had only limited success; it is shown that electron diffraction could overcome the problems encountered in neutron experiments.