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The specific heat of FCC Fe-Cr-Ni alloys has been determined in an adiabatic calorimeter between 300 and 1200K. The experimental curves reveal two anomalous maxima at 500K and 800-900K with only a weak concentration dependence. The anomalies can be interpreted by thermally excited electron transitions with energy gaps corresponding to absorption bands that have been found in the infra-red absorption spectrum.
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Bendick et al. (1981) studied this question.
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