Abstract
The depression of the homodiffusion coefficient of iron upon magnetic ordering is analyzed with the use of the Heisenberg model and Kirkwood's method. Data ofLai D. Y. F. andBorg R. J. (Trans. AIME233 (1865), 1975) andHettich G.,Mehrer H. andMaier K. (Scripta Met.11 (1977), 795) extended to the temperature range 511÷1200 ‡C have been used in this analysis. The computer fit of an analytic form, derived for the excess activation enthalpyδH p, to the experimental data enabled us to calculate the values of exchange integralJ 0=(345·3±3·6)k and of the paramagnetic temperatureT p=(1207±15) K. The activation enthalpy of homo-diffusion in a completely ordered ferromagneticα-Fe is higher by the valueδH p=(56·41±±0·59) kJ/mol than the value corresponding to a paramagnetic state. The expression forδH p, the experimental values ofJ 0 andT p and the Zener's theory of the frequency factorD 0 have been used to develop an equation giving the temperature variation of the homodiffusion coefficient in BCC iron for both, above and below the Curie temperature. A treatment analogous to the Bragg-Williams description of order-disorder in alloys was used to demonstrate that the long-range order parameter in ferromagnets is identical to the spontaneous magnetization ℒ. The quotient ofδH p(T)/δH p(0) may be well used as a short-range order characteristic.
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The author wishes to express his thanks to RNDr. K.Obrtlík (ÚFM čSAV Brno) for information concerning the applicability of [26] results in the present work.
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Kučera, J. Analysis of magnetic anomaly in BCC iron. Czech J Phys 29, 797–809 (1979). https://doi.org/10.1007/BF01797644
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DOI: https://doi.org/10.1007/BF01797644