Binary system

About: Binary system is a research topic. Over the lifetime, 5788 publications have been published within this topic receiving 97882 citations.

The viscosity of gaseous mixtures containing krypton

Abstract: The paper describes measurements of the viscosity of binary mixtures of krypton with CO2, CH4, CF4, and SF6 and of the two ternary mixtures, He–Ne–Kr and He–Ar–Kr. The measurements were performed in a high‐precision oscillating disk viscometer at atmospheric pressure. The observations extend over the temperature range 25–200 °C for Kr–CH4 and Kr–SF6, 25–400 °C for Kr–CF4, 25–500 °C for Kr–CO2 and He–Ne–Kr, and 25–600 °C for He–Ar–Kr. The uncertainty in the reported viscosities ranges from one of ±0.1% at 25 °C to 0.3% at 600°C. In the case of all of the binary mixtures it is shown that the kinetic theory collision integral for viscosity can be represented by the universal functional Ω22, characteristic of the extended law of corresponding states developed by Kestin, Ro, and Wakeham. The values of the two scaling parameters σij and eij for each interaction, which secure the optimum representation of this kind, are presented. Diffusion coefficients for each binary system are also derived from the experiment...

Separation of Phases by Spinodal Decomposition in the Systems Al2O3−Cr2O3 and Al2O3−Cr2O3−Fe2O3

Abstract: Separation of phases was investigated in the hexagonal (rhombohedral) systems Al2O3−Cr2O3 and Al2O3−Cr2O3−Fe2O3. The binary system shows a miscibility gap with a Tc of 950°C; the miscibility gap for the ternary system was determined for a constant Cr2O3 content of 16.6 mol%. Dark field transmission electron microscopy of solid solutions annealed within the miscibility gap showed dark and light lamellas ∼50 to 200 A thick. X-ray diffraction results for the solid solutions in the ternary system indicated that, in the early stages of annealing, broadening occurred only on (hkl) reflections where l≠0. There was no major change in the X-ray diffraction patterns of the annealed solid solutions in the binary system. Electron diffraction results indicated, however, that phase separation in both systems proceeded in the [001] direction. Solid solutions in the binary system separated very slowly; the separation could be enhanced hydrothermally. The mechanism of the separation of phases in both systems is spinodal and proceeds as follows: solid solution→intermediate modulated phase→equilibrium phases.