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The Mössbauer effect of Fe 57 has been studied for (Fe 1- x Ni x ) 97 C 3 with 0.28≤ x ≤0.36 and Fe 65 (Ni 1- x Mn x ) 35 with 0.05≤ x ≤0.3 alloys at liquid He temperature in order to know the mechanism of the abrupt decrease of the spontaneous magnetization of Fe-Ni alloys near the Invar region. A small decrease of the internal field in the Invar region is explained as a result of the decrease of the bulk magnetization. The Mössbauer spectra of Fe 65 (Ni 0.84 Mn 0.16 ) 35 under an external field of 50 kOe revealed that the iron atom has two electronic states, one is the magnetic state (µ Fe ∼3µ B ) and the other the nonmagnetic state (µ Fe ∼0). The pattern of the Mössbauer spectra of Fe-Ni-C alloys are explained by assuming that a part of iron atoms becomes to the non-magnetic state depending upon their nearest neighbor environments. The origin of the anomalous thermal expansion of the Invar alloy is discussed in connection with the Mössbauer spectra at elevated temperatures.
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Shiga et al. (1974) studied this question.
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