Showing papers on "Binary system published in 1977"
Journal Article•
185 citations
TL;DR: In this article, the driving force for crystallization in a binary system is considered from the thermodynamic viewpoint, and exact relationships, derived for particular cases, are compared with commonly used expressions of supersaturation calculated from solution concentrations.
68 citations
TL;DR: In this article, the miscibility gap of the α phase in Fe-Cr-Co permanent magnet alloys was constructed using mechanical hardness and Curie temperature measurements, and it was found that the Fe-cr binary system develops into Fe-c-co ternary system, and that the addition of cobalt raises the decomposition temperature, and extends the difference in concentrations between the iron rich phase and the chromium rich phase.
Abstract: The miscibility gap of the α phase in Fe-Cr-Co permanent magnet alloys is constructed using mechanical hardness and Curie temperature measurements. It is found that the miscibility gap of the Fe-Cr binary system develops into Fe-Cr-Co ternary system, and that the addition of cobalt raises the decomposition temperature, and extends the difference in concentrations between the iron rich phase (α 1 ) and the chromium rich phase (α 2 ). For instance, the α phase of an Fe-31%Cr-23%Co alloy exhibits a miscibility gap below 670°C, and decomposes into the (α 1 ) phase of 65%Fe-32%Co-3%Cr and the (α 2 ) phase of 69%Cr-21%Fe-10%Co at 600°C.
65 citations
TL;DR: In this article, a flow type of apparatus is built to give equilibrium gas and liquid samples at elevated pressures and temperatures while minimizing thermal decomposition, and Saturated vapor and liquid compositions and K values are determined with this apparatus for the binary system hydrogen/tetralin (1,2,3,4-tetrahydronaphthalene) at four temperatures from 189.6° to 389.1°C, and seven pressures from 20 to 250 atm.
Abstract: A flow type of apparatus is built to give equilibrium gas and liquid samples at elevated pressures and temperatures while minimizing thermal decomposition. Saturated vapor and liquid compositions and K values are determined with this apparatus for the binary system hydrogen/tetralin (1,2,3,4-tetrahydronaphthalene) at four temperatures from 189.6° to 389.1°C, and seven pressures from 20 to 250 atm. Vapor pressures of tetralin are determined with the same apparatus, and values are reported at the four temperatures of this work.
59 citations
28 citations
TL;DR: In this article, the authors measured shear viscosity as a function of molar composition and temperature near the consolute point of the binary system aniline-cyclohexane.
Abstract: Measurements of shear viscosity as a function of molar composition ? and temperature T near the consolute point of the binary system aniline–cyclohexane are reported. The results are analyzed in terms of the mode coupling theory. The needed dependence of the correlation length on ? and T is established using a scaling equation of state. The agreement between experiments and theory is quite good.
24 citations
TL;DR: In this paper, the Chao modification of the Redlich-Kister equation for correlating liquid activity coefficients is further modified to facilitate the evaluation of the constants, which are equally applicable to isothermal data and to isobaric data.
15 citations
TL;DR: In this paper, a theoretical study of simultaneous heat and mass transfer in binary distillation has been conducted and it was shown that the liquid phase was found to be saturated which indicated that all the resistance to mass transfer was in the vapor phase.
14 citations
12 citations
TL;DR: The ternary system nickel-copper-boron was established at 700°C by means of X-ray diffraction and metallographic examinations as mentioned in this paper, which confirmed the well known binary nickel borides.
Abstract: The ternary system nickel-copper-boron was established at 700°C by means of X-ray diffraction and metallographic examinations. Confirming the well known binary nickel borides no ternary boride was found. The solubility of boron in the nickel-copper solid solution is very small and has its maximum of about 0.3 at% in the binary system copper-boron. Differential-thermoanalysis shows a quasibinary eutectic between Ni3B and copper solid solution.
10 citations
TL;DR: In this paper, the peak sound absorption region of ternary systems of water-2-propanolurea, water-1,10-bis(triethylammonium)decane dibromide, and the binary system water 2-polypanol has been studied at 10, 30, and 50 MHz and in the temperature range 1.4 to 35°C.
Abstract: The peak sound absorption region of ternary systems of water-2-propanolurea, water-2-propanol-tetraethylammonium bromide, water-2-propanol-1,10-bis(triethylammonium)decane dibromide, and the binary system water-2-propanol has been studied at 10, 30, and 50 MHz, and in the temperature range 1.4 to 35°C. The results from the binary system show that the peak sound absorption composition (PSAC) is shifted to higher alcohol composition and (α/f2)max decreases with increasing temperature. At constant frequency, increased urea concentration has the same effect on PSAC and (α/f2)max values as does an increase in temperature for the binary system. All salts decrease α/f2 values at low concentrations but differ remarkably at higher concentrations. The results are interpreted qualitatively as showing the excess sound absorption in the PSAC region to be intimately related to the structural characteristics of water.
Journal Article•
TL;DR: The phase relationships in the TaGa binary system were examined in this paper, where X-ray analyses were carried out on powdered specimens whose compositions ranged fron 0 to 90 at% Ga.
Abstract: The phase relationships in the TaGa binary system were examined. X-ray analyses were carried out on powdered specimens whose compositions ranged fron 0 to 90 at.% Ga. Only two intermetallic phases Ta 5 Ga 3 and TaGa 2 were observed. The previously reported phases Ta 2 Ga, Ta 3 Ga 2 and TaGa 3 were not detected. The existence of an oxygen-stabilized phase Ta 5 Ga 3 O x , analogous to Nb 5 Ga 3 O x , was observed.
TL;DR: In this article, the authors review the processes that can be expected to occur in the first phase of mass-cxchange in binary systems, particularly those likely to produce binary x-ray sources.
Abstract: The article reviews the processes that can be expected to occur in the first phase of mass-cxchange in binary systems, particularly those likely to produce binary x-ray sources. Recent studies, following the pioneering investigation of Benson, ' indicate that the system will evolve into contact followed by a phase o f rapid and substantial loss of mass and angular momentum. Thus, earlier evolutionary schemes proposed f o r x-ray systems will require alteration in the sense of demanding progenitors of higher mass and greater initial periods.
01 Feb 1977
Journal Article•
TL;DR: In a close binary system with circular orbits, mass transfer occurs when material from one star fills up and possibly spills over its Roche lobe, the usual mass-radius relation cannot be used as it would lead to unreasonable results in some situations.
Abstract: In a close binary system with circular orbits in which mass transfer occurs when material from one star fills up and possibly spills over its Roche lobe, the usual mass-radius relation cannot be used as it would lead to unreasonable results in some situations.
TL;DR: In this article, the liquid-liquid equilibrium regions in binary systems were examined by the linear equation in (x 1/x′1)=a+bT Theb term is plottedvs the difference of polar character and one graph is obtained for the different systems.
Abstract: The liquid-liquid equilibrium regions in binary systems, one component of which is a dicarboxylic aliphatic acid, are examined by the linear equation in (x1/x′1)=a+bT Theb term is plottedvs the difference of polar character and one graph is obtained for the different systems
Abstract: The prediction of ternary liquid-liquid equilibria by means of the NRTL-equation and using the parameters obtained by the correlation of the limiting binary systems is examined. The predicted data are compared with experimental data for systems composed of an aromatic and an aliphatic hydrocarbon and sulpholane. The number of sets of binary parameters obtained from the correlation of the binary systems is infinite. For any value of the non-randomness parameter a corresponding pair of energy parameters can be determined, giving rise to a set fitting the data equally well. Limits to the value of the parameters can only vaguely be determined on the basis of their physical meaning. The upper limit of the non-randomness parameter related to the heterogeneous binary system is more precisely defined. Some general conclusions for the selection of the parameters could be reached. The predicted heterogeneous area is in general too large but decreases with increasing values of the non-randomness parameter of the heterogeneous binary system. The value of the parameters of the homogeneous binary system has only a small influence on the position of the binodal. The slope of the tie lines is mainly determined by the non-ideality of the homogeneous binary systems.
TL;DR: In this paper, a special copolymerization equation for such binary systems is derived and investigated, and a method is proposed for determining the reactivity ratios ( r ′ x ), based on a special Copolymer-composition equation from experiments at fairly high degrees of conversion.
Abstract: Specific features of copolymerization of acetylenic (X) and vinyl (M) monomers are discussed. A special copolymerization equation for such binary systems is derived and investigated. A method is proposed for determining the reactivity ratios ( r ′ x ), based on a special copolymer-composition equation from experiments at fairly high degrees of conversion. An equation is proposed for experimental verification of the applicability of the special copolymerization equation to a given binary system: 1/ r x = 1/ r ′ x + 1/ F , where r x is the reactivity ratio determined from the normal copolymerization equation and F = (M)/(X) is the molar ratio of the monomers initially.