Abstract
Elastic neutron scattering technique has been employed to study the short-range-ordering of deuterium atoms in α-TaD0.55 in the temperature range 65–80°C. The intensity distribution of 1/2 1/2 0 type diffuse pseudo-Bragg reflections is observed. Intensities of the 1/2 1/2 0 type diffuse reflection are not much temperature dependent as in the case of those observed in α-VD0.5 and α-NbHx=0.05−0.6. Warren-Cowley’s short range order parameter and the short range displacement are calculated.
The existence of almost spherical microdomains having a β2-TaD0.5-type structure with a diameter of about 1.2 nm is concluded from the present neutron diffraction work.
