An NMR Study on ¹H in HfV₂∙H_x Hydrides

Some characteristics of hydrogen storage of C-15 structure superconducting alloy HfV₂ are reported.
The NMR studies on ¹H in HfV₂∙H_x include a contrast between the experimental observation and the theoretical calculation of ¹H NMR second moment. The ¹H NMR was observed at relative low temperature for which the hydrogen atoms had been frozen in the host lattice. The ¹H NMR signal showed a broad spectrum, by which a careful computer simulation gave the experimental analytic value of the second moment. The theoretical value of the NMR second moment of the rigid lattice dipolar interaction was based on the informations had been offered by the neutron diffrections. There is a resonable agreement between the experiment and the theoretical calculation.
Along with the temperature increasing, the diffusion movement of the hydrogen in host lattice became rapidity which caused the resonance line narrowing. According to the line width-temperature depdndency observed a suit of coefficients describing the behaviour of the hydrogen diffusion in the host lattice are determined namely the attempted frequency, the activation energy and the diffusion constant.