In the framework of the quasichemical Williams-Bragg model an equation is obtained for the isotherm of gas absorption by the interstitials of the solvent lattice with the effect of ordering recognized; the equation is applied to analysis and interpretation of experimental data on oxygen absorption and ordering in superconducting YBa,Cu,O, + x ceramics. The oxygen absorption in both, tetragonal and orthorhombic structures is described by an absorption isotherm which fits the Langmuir equation. Extreme concentrations of the "absorption centers" are found as the oxygen absorption energy and entropy in the tetragonal (T) and orthorhomic (0) phases. The ordering of absorbed oxygen is shown to be unrelated with the "oxygen-oxygen'' pairwise interaction and is attributable to the "T --t 0" transition. The experimental isotherms of oxygen absorption by the ceramics lead to elements of the "temperature-concentration (X)" phase diagram which characterize the boundary between the T-and 0-phase regions. Im Rahmen des quasichemischen Williams-Bragg-Modells wird eine Gleichung fur die Isothermen der Gasabsorption durch Leerstellen des Losungsgitters unter Berucksichtigung des Ordnungseffekts erhalten; die Gleichung wird auf die Analyse und Interpretation von experimentellen Werten der Sauerstoffabsorption und Ordnung in supraleitenden YBa,Cu,O,+x-Keramiken angewendet. Die Sauerstoffabsorption sowohl in tetragonalen als auch rhombischen Strukturen werden durch Absorptionsisothermen beschrieben, die sich an die Langmuir-Gleichung anpassen. Extreme Konzentrationen der ,,Absorptionszentren", wie fur die Sauerstoffabsorptionsenergie und -entropie in den tetragonalen (T)und rhombischen (0)-Phasen werden gefunden. Es wird gezeigt, da13 der OrdnungsprozeR des absorbierten Sauerstoffs nicht mit der paarweisen ,,Sauerstoff-Sauerstoff '-Wechselwirkung korreliert ist und dem ,,T + 0"-Ubergang zuordnungsbar ist. Die experimentellen Isothermcn der Sauerstoffabsorption durch die Keramiken fiihren zu Elementen des ,,Temperatur-Konzentrations(X)"-Phasendiagramms, die die Grenze zwischen den T-und 0-Phasenbereichen charakterisieren.
Diffusion leveling of concentration in Al–Ag and Ni–Fe solutions subjected to high‐rate strain, ϵ = 100 to 102 s−1, ϵ = 0.1 to 0.9 at temperatures Tϵ = (0.4 to 0.9) Tm is studied by local X‐ray spectral analysis. The processes occurring during specimen strain and in the post‐strain period during their cooling in water or in air are experimentally studied. The corresponding diffusion coefficients are determined and interpreted with due account of point defects (during strain) and dislocations (in the post strain period).
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