Theory of the Snoek Effect in Ternary B.C.C. Alloys : V. Effect of Pairing Substitutional Solute Atoms

The damping spectrum of the Snoek effect is calculated for ternary b.c.c. alloys in which substitutional atoms exist both as isolated and as paired atoms. The calculation predicts the appearance of two peaks. P_1 and P_2, in addition to the ordinary Snoek peak. The peak P_2 is associated with interstitial atoms in the vicinity of pairs, while the peak P_1 consists of contributions from interstitial atoms near pairs as well as those near isolated substitutional atoms. The present theory also predicts that the relaxation of interstitial atoms around pairs (P_2) may occur through by-pass diffusion if the activation energy for direct jumps is very high