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The Zener relaxation is an anelastic relaxation process in disordered crystals due to stress-induced changes of atomic order. We present a model calculation of this process for a simple cubic lattice gas which is non-interacting except for the exclusion of multiple occupancies. The relaxation results from the stress-induced formation and dissolution of bonds between (paired) lattice gas atoms on nearest-neighbour sites. Relaxation spectra are obtained for the compressibility s 11 +2s 12 and the shear compliance s 11 −s 12 . The spectra are proportional to c 2 (1−c) 2 , where c is the occupation probability of a given site. The frequency dependence of the spectra is determined by the jump rate of the lattice gas atoms. Compared with a spectrum for a single relaxation time, the spectrum of s 11 − s 12 is moderately broadened, whereas the spectrum of s 11 + 2s 12 shows a sizable broadening. The present results are applicable to both interstitial and substitutional alloys.

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