Formation Energy of Superlattice for Ni_3Fe, I Co-Operative Formation of Superlattice at the Critical Temperature

概要

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Variation of inner energy for Ni_3Fe with time of the annealing at critical ordering temperature 490℃ are observed first by measuring the excess specific heat of the specimen annealed with various duration, and secondly by measuring the rate of decrease of inner energy at 490℃ using a new experimental method in which the necessary difference of temperature between the specimen and the surrounding wall for keeping the specimen at constant temperature 490℃ is measured. Then, the variation of inner energy shows a tendency of two steps character which had been observed until now for many other physical quantities of this alloy. Next, this phenomenon has been analysed as a simple superposition of two kinds of formation processes, i.e., a formation of short range order, which starts abruptly from the beginning and ends at about 15 hours of annealing, and a formation of long range order, which begins with a sufficiently small rate, increases gradually to its maximum at 20〜30 hours and then decreases to zero at about 60 hours of annealing.
社団法人日本物理学会の論文
1952-08-25