Conversion electron Mössbauer study of amorphous FeSi thin films

Amorphous FeSi films deposited at 77 K and at room temperature were studied by CEMS. The CEMS reflection spectra for bulk FeSi show quadrupole splittings, ΔE_S, larger by ～ 0.04 mm sec^?1 than ΔE_B - the ones shown by transmission spectra.For amorphous FeSi films ΔE was found (a) to decrease with the thickness of the film, and (b) to be by 25% larger for an amorphous film than for a crystallized one (of the same thickness).The crystallization was found to start at 240°C for a 300 Å thick film.