Proton spin-lattice relaxation time in ordering VHx alloys

Proton spin-lattice relaxation time is determined in VH0.68 and VH0.73 alloys in the temperature range of β1, β2 and δ ordered phases (400-100 K). Experimental results are described in terms of dipole-dipole interaction mechanism. On comparing calculated and experimental data in the complete temperature range the values of temperature dependent activation energy Ea and time constant τ0 are estimated.