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- W2022109748 abstract "The equations describing the temperature variation of D(T) in the entire region of the b.c.c.-Fe phases α and δ are given. These equations are used in analysing the magnetic Co-heterodiffusion anomaly in b.c.c.-Fe and, for comparison, in the re-analysis of α-Be self-diffusion data. The values obtained on the basis of the present analysis are, the pre-exponential factor D0p and the activation enthalpy Hp appropriate for a completely disordered state, the α-Fe exchange integral J0, the paramagnetic temperature Tp, and the ratio ΔHm/ΔHF of the excess activation enthalpies of vacancy migration ΔHM and formation ΔHF. The application of Zener's theory of D0 makes it possible to propose the pre-exponential factor D0f and the activation enthalpy Hf for a completely ordered ferromagnetic state. The relation of the magnetic diffusion anomaly to the α-Fe elastic constants is investigated. Es werden die Gleichungen angeführt, die die Temperaturabhängigkeit des Diffusionskoeffizienten D(T) im ganzen Temperaturbereich von k.r.z.-Fe (α- und δ-Phasen) beschreiben. Diese Gleichungen werdcn zur Analyse der magnetischen Co-Fremddiffusion Anomalie in k.r.2.-Fe angcwendet. Dnneben wird auch — vergleichweise — cine wiederholte Analyse der Fe-Selbstdiffusion in α-Fe angeführt. Die Größen, die durch die Anwendung der beschriebenen Analyse gewonnen warden können, sind: der praU-exponentielle Faktor D0p und die Aktivierungsenthalpie Hp für einen völlig magnetisch ungeordneten Zustand, das Austauschintegral J0 in α-Fe, die paramagnetische Temperatur Tp und das Verhältnis, ΔHM/ΔHF, der Zusatzenthalpien von Leerstellenwandcrung ΔHM und Leerstellenbildung ΔHF. Die Applikation der Zener-Theorie des prä-exponentiellen Faktors ermöglicht die Kalkulation von D0f und Hf, die für einen völlig magnetisch geordneten Zustand gültig sind. Der Zuaammenhang zwischen der magnetischen Diffusionsanomalie und den elastischen Konstanten von α-Fe wird untersurht." @default.
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- W2022109748 date "1984-02-16" @default.
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- W2022109748 title "Magnetic Anomalies of Self-Diffusion and Co Heterodiffusion in α-Fe" @default.
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