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A theory of mechanical relaxation of substitutional-interstitial (tetrahedral) atom complexes in the b.c.c. lattice

Abstract The relaxation of an atom pair consisting of a substitutional atom and a tetrahedral interstitial atom in the b.c.c. lattice is studied theoretically. The pair exhibits three relaxation modes: one T 2g and two E g modes. The relative relaxation magnitude of the two E g modes depends strongly on the anisotropy of the λ tensor. Experimental results of internal friction studies of Nb[sbnd]Ti[sbnd]H and V[sbnd]Ti[sbnd]H alloys are discussed in the light of the present analysis.