Self-diffusion and isotope effect in α-ironSelf-diffusion and isotope effect in α-iron have been studied by a serial radio-frequency sputter-microsectioning method with radioactive tracers 55Fe and 59Fe in the temperature range 766–1148 K. Above the Curie temperature the self-diffusion ...
Furthermore the simultaneous diffusion of Fe 55 and Fe 59 in iron was investigated at 6 temperatures in the above-mentioned interval. For the isotope effect E B, which is defined by the equation: E B = 1 D B D A 1 m A m B 1 2 where D H/ D A and m A/ m B are the ...
The self‐diffusion isotope effect has been measured by serial sectioning in the α, γ, and δ phases of iron. Values for the isotope effect assuming a si... D Graham - 《Journal of Applied Physics》 被引量: 24发表: 1969年 Impurity diffusion and isotope effect of cobalt in α-iron Im...
H2O, as hydrogen (H) bonded to the crystal structure, can influence the physical and chemical properties of minerals even if only present at ppm wt levels7. For example, H influences the rheological properties of minerals and has been proposed as a possible factor in weakening H-bearing olivin...
Isotope-effect measurements, using isotopes Cr and Cr, have been made over the temperature range 1440-1810°C. The isotope effect decreases as the temperature increases in a manner similar to that found for sodium and iron in the same homologous temperature range. The large activation ene...
The self-diffusion activation energy in pure γ-iron is shown to be ∼312 kJ/mol. Alloying of austenite with such elements as Mn, Mo, Nb, Ti, and Si (to a lower degree) increases the self-diffusion activation energy, and alloying with C, V, or Cr (for the element content ≥3 ...
Isotope Effect in Self-Diffusion in Iron The isotope effect in self-diffusion was measured in the δ, γ, and α phases of Fe using a new isotope pair, Fe52-Fe59. The isotope-effect data, together... C.,M.,WALTER,... - 《Physical Review》 被引量: 0发表: 1969年 ...
These results, together with the authors' previously published results on iron impurity diffusion in vanadium, are analysed using the vacancy models of Le Claire (1970) and Jones and Le Claire (1972) to calculate the isotope effect parameters fi , which are then compared with the measured ...
The residual activity method has been applied using the isotope 59Fe. Special attention was payed to the close neighbourhood of the Curie temperature. The obtained data confirmed the effect of ferromagnetic ordering on the iron self-diffus ion in pure Fe and in all the investigated Fe-Cr alloys...
The oxygen-partial-pressure dependence of the diffusivity indicates that cation self-diffusion occurs by an interstitial-type mechanism The simultaneous diffusion of 52Fe and 59Fe has been measured in Fe2O3. The small value of the isotope effect suggests that iron ions diffuse by an noncollinear...