Showing papers on "Binary system published in 1982"
93 citations
TL;DR: In this paper, the phases occurring in the binary tungsten-oxygen system in the composition region WO 3 WO 2 have been clarified by electron microscopy and powder X-ray diffraction in the temperature range from 723 to 1373 K.
72 citations
01 Feb 1982
TL;DR: Results from the Langmuir-Hinshelwood kinetic approach to modeling adsorption of human γ-globulin, on an artificial surface (quartz) are explored as an example of a putative general approach for multicomponent systems.
Abstract: In a previous paper the Langmuir-Hinshelwood (L-H) kinetic approach to modeling adsorption of human γ-globulin (G), on an artificial surface (quartz) was tested against new experimental data. The principal purpose of this paper is to explore the extension of that approach to a binary system as an example of a putative general approach for multicomponent systems. In particular the previous results along with new results from a second single-protein system, human albumin (A), modeled as in the previous study, are combined with new results for the binary system γ-globulin-albumin.
63 citations
TL;DR: In this paper, a van der Waals equation of state is applied to calculate phase equilibria in hydrogen-bonding, non-electrolytic systems, which involves essentially one weakly temperature-dependent adjustable parameter per binary system.
41 citations
TL;DR: In this paper, a T-X section of the N2CO2 binary system was generated from 23 inclusions from Triassic dolomites and evaporites (northern Tunisia).
40 citations
TL;DR: In this article, isothermal vapor-liquid equilibrium data have been measured for the binary systems benzene-phenol (80 /sup 0/C), n-octane-phenols (110 /sup 1/C) and n-decane-pharmol (120 /sup 2/C).
Abstract: Isothermal vapor-liquid equilibrium data have been measured for the binary systems benzene-phenol (80 /sup 0/C), n-octane-phenol (110 /sup 0/C), and n-decane-phenol (120 /sup 0/C). Thermodynamic consistency was checked by two methods, and the parameters in different expressions for the excess Gibbs energy have been fitted. Furthermore, the region of mutual solubility (LLE, SLE) of the binary system n-decane-phenol has been investigated.
31 citations
29 citations
21 citations
TL;DR: In this paper, the binary system of citric acid-water has been investigated with static vapour pressure measurements, adiabatic calorimetry, solution calcorimetric, solubility measurements and powder X-ray measurements.
21 citations
TL;DR: In this paper, a method is given to derive absolute dimensions from data of spectroscopic binary systems, with application to the 7th Catalogue of Spectroscopic Binary Systems of Battenet et al.
Abstract: A method is given to derive absolute dimensions from data of spectroscopic binary systems, with application to the 7th Catalogue of Spectroscopic Binary Systems of Battenet al. (1978). The different samples of solutions are analysed with regard to existing solutions. Absolute dimensions are given for 62 systems, not included in the tables of Popper (1980), Lacy (1979), and Giannone and Giannuzzi (1974).
19 citations
TL;DR: In this article, four different methods of calculation of retention in ternary mobile phases were compared and it was found that the simple calculation based only on two values of the capacity factors (one for each binary system that composes the ternarary mobile phase) provides the accuracy of prediction that is, at least, comparable to the other methods of calculating that require a large number of preliminary experiments.
Abstract: Four different methods of calculation of retention in ternary mobile phases were compared and it was found that the simple calculation based only on two values of the capacity factors (one for each binary system that composes the ternary mobile phase) provides the accuracy of prediction that is, at least, comparable to the other methods of calculation that require a large number of preliminary experiments. The deviations from ideal behaviour in ternary solvent mixtures are discussed; some sources of errors can be avoided, at least partially, using binary systems of adequate compositions for preparation of ternary mobile phases. Several examples show the comparison of calculated and experimental selectivities in ternary solvent systems. A simple calculation can be used for rapid selection of an adequate ternary (or more complex) mobile phase, if it is necessary to achieve the separation of a given sample mixture.
TL;DR: In this paper, an extended form of the empirical Langmuir isotherm, in which the parameters are obtained from single component data, satisfactorily describes the adsorption of binary mixtures.
TL;DR: In this article, a portion of the Cu-Pb-Sn ternary diagram was determined experimentally using thermal analysis, metallography, and electron microprobe analysis.
Abstract: A portion of the Cu-Pb-Sn ternary diagram was determined experimentally. The investigation was concentrated on the high Pb corner and, to a lesser extent of alloys from Sn to the binary Pb-Sn eutectic. The experimental techniques used were thermal analysis, metallography, and electron microprobe analysis. A new technique for determining liquidus temperatures was used. For the high Pb region the proposed ternary eutectic at 0.06 Cu 0.02% SnPb (all compositions are in weight %) was not observed. For most alloys the primary crystallization phase was Cu3Sn. It was shown that Cu6Sn5 exists in the solid state; for high Sn alloys, it was observed that the addition of Pb reduced the decomposition temperature of Cu6Sn5. A ternary eutectic reaction near the binary Pb-Sn eutectic was confirmed, and the temperature of the ternary eutectic was 1°K below that of the binary eutectic. Liquidus temperatures as well as other reactions detected by thermal analysis will be presented.
TL;DR: The binary phase diagram of the SrF2-MgF2 system below 1200°C has been constructed from DTA cooling data as mentioned in this paper, which shows an eutectic at 48.4 mole % MgF 2 and 871°C, and a peritectic at 50 mole % and 880°C.
TL;DR: In this article, the crossover point between hard binaries (tightly bound binaries) and soft binaries (more loosely bound binaries which decrease their binding energies in collisions) was found to occur at approximately 1.9 when the mass of the impacting star is three or more times greater than that of this binary component.
Abstract: A total of 45 760 simulated encounters between binary and single stars were run to study the effect of impact velocity and the masses of the three stars on the outcome of the collisions. Letting ..cap alpha.. be the kinetic energy of impact in units of the minimum kinetic energy required to break up the binary, we find that the crossover point between hard binaries (tightly bound binaries which increase their binding energies in the collisions) and soft binaries (more loosely bound binaries which decrease their binding energies in collisions) occurs at ..cap alpha..approx. =0.5 if the impacting single star is equal to or less massive than the binary components and occurs at ..cap alpha..approx. =10 if its mass is three or more times that of the binary components. This bimodal behavior of the crossover point is even more clearly defined when we find its location in terms of the impact velocity V/sub f/ , expressed in units of the original mean orbital speed V/sub o/ of the binary. We find that the crossover point occurs at V/sub f//V/sub o/ approx. =0.6 when the mass of the impacting star is equal to or less than that of the more massivemore » binary component, and it occurs at V/sub f//V/sub o/ approx. =1.9 when its mass is three or more times greater than that of this binary component. The probability that the binary will be broken up in the encounter depends greatly on the mass of the impacting single star relative to that of the binary components, as well as on the impact velocity. If the single-star mass equals or exceeds that of the individual binary components, there is an interval of impact velocity over which all the binaries are broken up in encounters at the zero-impact parameter. This interval grows as the mass of the impacting single star increases. If the impacting star is less massive than the binary components, then the maximum probability of dissociation drops dramatically.« less
TL;DR: In this article, the binary PTxy vapor-liquid equilibrium data for the benzene+hexane system were evaluated, and the needs for new experimental data were defined, as well as the criteria for new data.
Abstract: The binary PTxy vapor–liquid equilibrium data for the benzene+hexane system are evaluated. The needs for new experimental data are defined. Key words: activity coefficients; benzene; excess Gibbs function; hexane; vapor–liquid equilibrium.
TL;DR: In this article, an isothermal flow calorimeter was used to measure enthalpies of mixing for the binary gaseous system methane-hydrogen sulfide at temperatures of 293.15, 305.15 and 313.15 K. For each isotherm, the measurements were made at pressures of 0.507, 1.013, and 1.520 MPa (5, 10, and 15 atm).
Abstract: Enthalpies of mixing for the binary gaseous system methane-hydrogen sulfide were measured by an isothermal flow calorimeter at temperatures of 293.15, 305.15, and 313.15 K. For each isotherm, the measurements were made at pressures of 0.507, 1.013, and 1.520 MPa (5, 10, and 15 atm, respectively). The experimental results were compared with those predicted from the equation of state of Benedict-Webb-Rubin and Redlich-Kwong and the Redlich-Kwong equation with the modifications proposed by Jacoby and Robinson.
TL;DR: In this article, liquid-liquid equilibrium data obtained over the temperature range 10-60°C for the binary system water + methyl isoamyl ketone (MIAK) are presented together with ternary data for the system water+ acetic acid + MIAK at 15, 25 and 40°C.
TL;DR: In this paper, the upper critical solution temperatures (UCST) of CHF 3 were investigated in the temperature range 118 to 170 K and at pressures up to 200 MPa using the synthetic method.
TL;DR: The ternary equilibrium diagram Zn-Sn-Se has been calculated for a liquid of composition xZn =xSe = 10-2 to 5x10-2.
01 Sep 1982
TL;DR: In this paper, an experimental study of the seeded growth of PbSnTe single crystals in a vertical Bridgman-Stockbarger (B-S) furnace was conducted.
Abstract: Results are reported for an experimental study of the seeded growth, of PbSnTe single crystals in a vertical Bridgman-Stockbarger (B-S) furnace. Profiles of axial and radial segregation of Sn are presented for crystal growth from melts with aspect ratios of 15 and 6.8; the profiles indicate intense convective mixing. A one-dimensional model of heat and mass transfer in an idealized B-S furnace with diffusion control is used to examine the importance of liquidus-solidus separation in determining growth-rate and composition transients in a pseudobinary system. It is shown that the coupling of heat and mass transfer in a pseudobinary system with a large liquidus-solidus separation causes the transient behavior in a nondilute system to differ markedly from such behavior in a dilute system and that PbSnTe crystals with a reasonable diameter can be grown under nearly convectionless conditions in a microgravity environment.
TL;DR: In this paper, the evaluation results for the benzene+cyclohexane system were presented, and the needs for new experimental data were defined, as well as the methods used to evaluate excess enthalpy data.
Abstract: The methods used to evaluate excess enthalpy data are described. The evaluation results for the benzene+cyclohexane system are presented. The needs for new experimental data are defined.
TL;DR: In this article, the Flory's statistical theory has been applied to evaluate the pseudo-Gruneisen parameter for pure molten salts and their isothermal composition dependant binary system and the agreement between the calculated and experimental values was found to be good.
Abstract: The Flory’s statistical theory has been applied to evaluate the pseudo‐Gruneisen parameter for pure molten salts and their isothermal composition dependant binary system. The agreement between the calculated and experimental values was found to be good. The experimental values of the pseudo‐Gruneisen parameter (Γ) were evaluated by substituting experimental values of specific heat ratio (Γ) and thermal expansion coefficient (α) in the equation of state relationship Γ = (γ−1/Tα). (AIP)
TL;DR: In this article, a gap in the pulse-period distribution of binary X-ray pulsars has been explained in terms of the character of mass transfer in the Xray binary systems, and it is shown that this gap arises because the rotating magnetised neutron stars in these systems are slowed down by accretion torques.
Abstract: The pulse-period distribution of binary X-ray pulsars has been considered. A gap in this distribution, in the period rangeP∼10 s toP∼100s has been explained in terms of the character of mass transfer in the X-ray binary systems. It is shown that this gap arises because the rotating magnetised neutron stars in these systems are slowed down by accretion torques, either toP≲10 s when the mass transfer is by means of Roche-lobe overflow in low mass binaries, or toP≳100 s by stellar winds in massive binaries. The gap is maintained as the slow pulsars (P>100 s) in their spin-up phase cross the gap in a time short compared to their life-time, because of the increase in mass transfer with the evolution of the normal star.
TL;DR: In this paper, a simple model is proposed which requires three physical parameters for each salt: the crystal lattice energy, the latent heat of melting and the sum of the ionic radii.
Abstract: In order to calculate excess chemical potentials of the components in binary molten salt mixtures, a simple model is proposed which requires three physical parameters for each salt: the crystal lattice energy, the latent heat of melting and the sum of the ionic radii. The model has been used to calculate the liquidus temperature for various compositions of the binary system. Calculated and experimentally determined phase equilibria for the following systems are compared: LiF–KF, LiF–NaF, NaF–KF, LiCl–KCl, NaCl–CsCl, LiNO3–NaNO3, CaF2–MgF2, LiF–CaF2, NaF–CaF2 and NaCl–SrCl2.
TL;DR: A simple first approximation procedure for making changes to the thermodynamic properties of an end member pure compound is presented, and illustrated by application to the CaOAlO1.5 binary system.
Abstract: Whenever the thermodynamic properties of an end member pure compound are revised, it is necessary to revise all the terms used for binary systems including that compound. A simple first approximation procedure for making these changes is presented, and illustrated by application to the CaOAlO1.5 binary system. Refinement to a second approximation is discussed and demonstrated. A set of parameters is given for CaOAlO1.5 appropriate to a heat of fusion for CaO lowered from 68 to 59 kJ mol−1 and an increased heat capacity for AlO1.5(l). The AlO1.5 SiO2 system has been similarly updated.
TL;DR: In this paper, the temperature of the stellar wind from a binary system Gamma(2) Vel has been observed in the ultraviolet at various phases and the mass flow occurs in all directions from the binary.
Abstract: The close binary system Gamma(2) Vel, consisting of a WC8 and an O9 I star, has been observed in the ultraviolet at various phases. Preliminary analysis of selected data shows that the temperature of the stellar wind from this binary increases outward. This suggests that an additional source of energy other than radiation pressure may exist for the wind. The mass flow occurs in all directions from the binary. However, there is evidence of an increase in the mass flow through the third Lagrangian point, although from the extant data it is not possible to decide whether or not a similar increase in the mass outflow occurs through the second Lagrangian point. There is also evidence of mass surge, which probably is independent of orbital phase.
TL;DR: In this paper, the remaining core hydrogen burning lifetime after case B of mass transfer of the secondary component in a medium mass close binary star is estimated, for medium mass binaries with primaries in the mass range 5M⊙ to 9M ⊙.
Abstract: The remaining core hydrogen burning lifetime after case B of mass transfer of the secondary (mass gaining) component in a medium mass close binary star is estimated, for mediummass binaries with primaries in the mass range 5M⊙ to 9M⊙. From the comparison of this quantity with the helium burning time-scale of the remnant primary a critical mass ratioqc is derived such that for larger values ofq, mass transfer from the secondary towards the primary starts before the latter has evolved into a white dwarf. Consequences for the advanced stages of medium mass binaries are discussed.
TL;DR: In this paper, the phase diagram of the alloys of the gadolinium-indium binary system was studied by differential thermal analysis, X-ray diffraction method and microscopic observation.
Abstract: A phase diagram of the alloys of the gadolinium-indium binary system was studied by differential thermal analysis, X-ray diffraction method and microscopic observation The following six intermediate phases were verified: Gd 3 In,Gd 2 In,Gd 5 In 3 ,Gdln,Gd 2 In 3 and Gdln 3 There are five eutectic transformations corresponding respectively to about 12 at % In (eutectic temperature 988℃), 305 at % In (1151℃), 385 at % In (1114℃), 645 at % In (1010℃) The eutectic on the In-rich side is degenerate The decomposing temperature of the compound Gd 2 In 3 formed by peritectie reaction is T per = 1107℃ The periteetoid reaction 2Gd 2 +GdIn←→Gd 5 In 3 occurs at 1071℃ Neither In in Gd nor Gd in In shows any detectable solid solubility
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