Showing papers on "Ternary operation published in 1975"

Enthalpies de formation des alliages liquides bismuth-étain-gallium à 723 k. Choix d’une représentation analytique des grandeurs d’excès intégrales et partielles de mélange

Abstract: With a calorimeter at 723 K, we have determined the enthalpies of formation of some ternary liquid alloys which consist of bismuth-gallium-tin. We have compared our experimental results with those estimated according to excess functions of mixture and we have found that enthalpies of mixture are satisfactory represented by proposed equation. Based on these results, we give an analytical representation of partial mixing enthalpies of this ternary liquid system.

Ternary Cu2+ Complexes: Stability, Structure, and Reactivity

Abstract: The driving forces leading to the formation of ternary Cu2+ complexes are outlined; they are (i) statistical reasons, (ii) neutralization of charge in the mixed-ligand complexes, (iii) steric factors (bulky groups, ring size of chelates), and (iv) formation of π bonds. The last point is important for achieving a large stability, as well as for the observation of discriminating qualities. An additional stability increase may possibly be achieved through a direct interaction between the two ligands bound to the same metal ion, i.e. Schiff base formation, hydrogen bonding or a charge-transfer relation. The latter leads to distinct structures, i.e. metal ion-bridged charge-transfer complexes. The relation between stability and structure on the reactivity of mixed-ligand complexes is emphasized. The relevance of the results for mixed-ligand complexes containing metal ions other than Cu2+ is briefly outlined.

Oxide chemistry. Part II. Ternary oxides containing copper in oxidation states-I, -II, -III, and -IV

Abstract: We report an investigation of the preparation, structure, and magnetic properties of ternary oxides containing copper in oxidation states-I, -II, -III, and -IV. The compounds described are: ACuO2(A = Al or Ga); AcuCo2(A = Ca, Sr, or Ba), A2Cu2O5(A = Sc, Y, Bi, or In), and A2CuO4(A = La, Al, or Ga); BaCuO2·5, ACuO3(A = Y or La); and BaCuO2·63 which is the only phase containing copper(IV) which could be obtained. X-Ray pcv.der patterns have been indexed wherever possible and magnetic-susceptibility measurements from 80 to 300 K are interpreted for all paramagnetic species.

Spin-3/2 Ising model for tricritical points in ternary fluid mixtures

Abstract: We present a lattice-gas model of ternary fluid mixtures. Within the mean-field approximation, we study a nonsymmetric tricritical point in this model. We compare our results to the experimental observations on the system ethanol-water-carbon-dioxide. In the course of our work, we have studied a Landau theory describing the neighborhood of a fourth-order critical point. Also, we have noted that mean-field theory indicates the existence of a fourth-order critical point in the spin-1 model of Blume, Emery, and Griffiths, corresponding to $Kl0$, $J+Kg0$.

Vapor‐liquid equilibrium: Part IV. Reduction of P‐x data for ternary systems

Abstract: Total pressure measurements taken for the ternay systems acetone-chloroform-methanol and chloroform-ethanol-n-heptane at 50°C are reduced by Barker's method and correlated by an equation similar to one proposed by Wohl (1953).

Non-isothermal finite diffusion-controlled growth in ternary systems

Abstract: A mathematical model has been developed for diffusion controlled phase growth in ternary systems. Local equilibrium at phase boundaries and one dimensional diffusion controlled growth is assumed. The model includes a method of determining phase growth velocity and interface compositions consistent with the diffusion rate of both solute elements. This method also accounts for the effects of overlapping diffusion fields and nonisothermal growth. Initial conditions can be any curvilinear composition gradients and boundary conditions can be fixed or vary with time and/or temperature. The Crank-Nicolson finite difference equations are used to provide numerical stability and flexibility. Other capabilities of the model include treatment of finite systems, of nonisothermal phase growth and of off-diagonal ternary coefficients (D 21 3,D 12 3). Several sample simulations of the constant cooling of a 2.1 wt pct P, 4.1 wt pct Ni, 93.8 wt pct Fe alloy are presented. Three cooling rates are used: 5×10−3, 5×l0−4, and 5×l0−5 °C/s. An Fe-Ni-P alloy of this same composition was cooled in the laboratory for five days at 5×lo−4 °C/s from 900 to 685°C. Excellent agreement was found for the predicted and measured composition gradients and precipitate sizes.

Prediction of thermodynamic properties of ternary liquid solutions including metal alloys

Abstract: The free-volume theory of liquid solutions formulated by Flory and also by Patterson for binary systems, has been extended to ternary systems. Numerical calculations have been performed to test the validity of the approach, for a system of organic liquids, for a system of condensed gases, and also for a system of liquid metal alloys. Satisfactory results have been obtained in all cases. Thus, prediction of properties of ternary solutions from a limited number of data concerning pure components and binary mixtures was found possible.

Temperature and compositional dependence of magnetic bubble properties of amorphous Gd‐Co‐Mo films

Abstract: It is shown that the temperature and compositional dependence of the magnetic bubble properties of amorphous Gd‐Co‐Mo sputtered films can be described satisfactorily by simple models based on mean field analysis of the experimental data. Using the fitting parameters obtained, bubble properties such as 4πMs, l, Q, and Hs (collapse field) are predicted as a function of temeprature for 1‐, 0.5‐, and 0.25‐μm‐diam bubbles. Optimum compositions for small temperature derivatives are suggested by this analysis. Some consideration of the dynamic properties for the present ternary films is also given.

Redox reactions of layered transition metal disulfides in alkali halide melts

Abstract: Layered ternary Sulfides, A 0.5 TiS 2 and A 0.5 .5NbS 2 (with A = Li, Na, K, Rb, Cs), were obtained by the reaction of TiS 2 and NbS 2 in alkali halide melts with H 2 S, in a flow reactor system at 800−1000 °C. On contact with water the ternary compounds give the hydrated phases, A 0.5 (H 2 O) y [TiS 2 ] and A 0.5 (H 2 O) y [NbS 2 ], with polyelectrolyte character. TaS 2 , under similar conditions, in an inert gas atmosphere yields layered tantalum sulfides A 0.3 TaS 2 . Redox reactions of transition metal complexes soluble in the halide melts are supposed to be responsible for the formation of the ternary chalcogenides.