The interdiffusion of Fe-Ti compositionally modulated films was investigated by using dynamic in-situ X-ray diffraction techniques and a position-sensitive proportional counter. Auger energy spectral analysis was used to determine the composition, to reveal the modulation period, and to monitor directly the interdiffusion of the multi-layers. The decay of the X-ray modulation peak intensity was measured at temperatures ranging from 150 to 325C, and a peak position shift was observed. The effective interdiffusivities of Fe-Ti multi-layers were calculated for various temperatures, and plots of the effective interdiffusivity versus time were obtained for those temperatures. From the rate of variation of the diffusion coefficient as a function of time, the activation energy (which was related to viscosity relaxation) was calculated to be equal to 35kJ/mol.

H.Y.Bai, H.Chen, Y.Zhang, W.K.Wang: Physica Status Solidi A, 1993, 137[1], 125-33