✍ Scribed by S. Nasu; Y. Murakami
No coin nor oath required. For personal study only.
The Mössbauer effect of Fe^57^ in aluminum was measured over a temperature range from 4.2 °K to 453 °K, using a specimen of supersaturated solid solution of Al‐0.01% Fe^57^ alloy. From the temperature dependence of the Mössbauer peak position, the second‐order Doppler shift and the isomeric shift of Fe^57^ in aluminum were estimated separately from the observed total shifts assuming the isomeric shift to be temperature independent. The estimated temperature independent isomeric shift was (0.52 ± 0.02) mm/s relative to metallic iron, somewhat different from the usual room temperature value of (0.43 ± 0.02) mm/s. The temperature dependent second‐order Doppler shift was analysed by the recent Mannheim's expression and the Debye formula. The best fitted force‐constant ratio, λ′/λ, for the iron atom in aluminum host lattice was estimated to be 0.5 < λ′/λ < 1. The zero point kinetic energy of Fe^57^ in Al was also evaluated by differences between the shifts at 4.2 °K and those at high temperatures.
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