Abstract
The measurement of the diffusional Mössbauer line broadening in single crystalline samples at high temperatures provides microscopic information about atomic jumps. We can separate jumps of iron atoms between the various sublattices of Fe-Si intermetallic alloys (D03 structure) and measure their frequencies. The diffusion of iron in Fe-Si samples with Fe concentrations between 75 and 82 at% shows a drastic composition dependence: the jump frequency and the proportion between jumps on Fe sublattices and into antistructure (Si) sublattice positions change greatly. Close to Fe3Si stoichiometry iron diffusion is extremely fast and jumps are performed exclusively between the three Fe sublattices. The change in the diffusion process when changing the alloy composition from stoichiometric Fe3Si to the iron-rich side is discussed.
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Sepiol, B., Vogl, G. Diffusion in ordered Fe-Si alloys. Hyperfine Interact 95, 149–159 (1995). https://doi.org/10.1007/BF02146311
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DOI: https://doi.org/10.1007/BF02146311