Binary system

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

Surface Tension of Binary Mixtures of Ethanol + Ethylene Glycol from 20 to 50 °C

Abstract: Surface tension data of binary mixtures of ethanol + ethylene glycol were measured over the entire concentration range at temperatures from 20 to 50 °C. The experimental values were correlated with temperature and with mole fraction. The values of the excess surface tension for these mixtures were also calculated.

Phase Equilibria in the System NiO–Al2O3–SiO2

Abstract: Equilibrium diagrams for the systems NiO-SiO2, NiO-Al2O3, NiAl2O4-SiO2, Ni2SiO4-NiAl2O4, and NiAl2O4-Al6Si2O13 were drawn from data obtained by quenching and direct observational techniques. The only intermediate compound in the binary system NiO-SiO2 is Ni2SiO4, which has the olivine structure. Unlike other olivines which melt congruently, nickel olivine has an upper temperature of stability (1545°C) and at temperatures between 1545° and 1650°C, NiO and SiO2 coexist in equilibrium. The only compound in the binary system NiO-Al2O3 is NiAl2O4, which has a spinel structure. The nickel aluminate spinel varies in composition from 50 to 35 mole % Al2O3 at 1800°C, and the stoichiometric NiAl2O4 composition has a melting point near 2110°C. Of the joins within the ternary system NiO-Al2O3-SiO2 which were studied, only Ni2SiO4-NiAl2O4 is not binary. In this join, crystals of NiO exist in equilibrium with liquid and a ternary assemblage of NiO + NiAl2O4+ liquid is stable to 1775°C. The decomposition temperature of Ni2SiO4 is decreased from 1545°C in the binary system to approximately 1490°C, presumably the result of solubility of NiAl2O4 in Ni2SiO4. The join NiAl2O4-SiO2 is binary in that the compositions of crystalline phases can be expressed in terms of the chosen components. The eutectic temperature in the system is 1495°C. The join NiAl2O4-Al6Si2O13 is binary for the same reasons and has a eutectic temperature at 1720°C. Using the data obtained in this study and those published for the well-known system Al2O3-SiO2, a liquidus surface diagram for the system NiO-Al2O3-SiO2 is proposed. Nickel olivine, even though it has an upper limit of stability in the binary system, has a primary field in the ternary system NiO-Al2O3-SiO2. This is the only refractory oxide system known to illustrate this so-called “typical case,” the governing principles of which have been clearly presented in discussions of phase equilibria.

Phase Equilibria Relations in the Ternary System BaO ‐ SrO ‐ Nb2 O 5

Abstract: Phase equilibria in the binary system and the ‐rich region of the ternary system were investigated by DTA, x‐ray diffraction, strip heater, and Curie temperature measurement techniques. The ternary‐phase fields of three tetragonal‐tungsten‐bronze type structures have been located, Only one of these structures is a ternary compound; it is located along the binary join, extending from 20 to 80 m/o , and melts congruently near 50% . The ternary solubility extends from about 4% excess to about 1% excess . This phase possesses observable orthorhombic distortion in the ‐rich region of the solid solution. The implications of the phase diagram for the crystal growth of these compounds are briefly discussed.