摘要:

Les mesures de la résistivité, du pouvoir thermoélectrique et de la susceptibilité magnétique pour les alliages binaires á base d'aluminium et de métaux de transition 3d (Fe, Co et Ni) ont été effectuées au dessus du point de fusion, pour la concentration de 1 at. % d' impureté. La forte réactivité chimique de l'aluminium, nous a conduit à utiliser une technologie en alumine et à introduire une méthode expérimentale pour la mesure du pouvoir thermoélectrique absolu que nous décrivons en détail.

ISSN:0031-9104    

DOI:10.1080/00319109608029567

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

摘要:

The experimental literature data on vapor-liquid equilibria (VLE), excess molar Gibbs energies (GEm), excess molar enthalpies (GEm) and activity coefficients ofn-alkylamine + benzene mixtures are interpreted in terms of the DISQUAC group contribution model. The systems are characterized by three types of groups or contact surfaces: aliphatic (a), benzene (b) and amine (n). The interchange energies of the aliphatic/benzene and aliphatic/amine contacts were determined independently from the study of benzene +n-alkane andn-alkylamine +n-alkane systems, respectively. The interchange energies of the benzene/amine contact were calculated in this work from experimentalGEmandGEmvalues. In view of the importance of the NH2-π interaction, we have kept constant a quasichemical coefficient for the benzene-amine contact and we have only varied the dispersive coefficients with the length of then-alkylamine. The model reproduces quite well the experimental data.

ISSN:0031-9104    

DOI:10.1080/00319109608029568

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

摘要:

A procdure using the Reverse Monte Carlo technique was shown to find the correct microscopic density of scattering centers (atoms, ions, etc.) in a model liquid within about 2%, on the sole basis of diffraction data. The method was also tested on solid amorphous systems of low, as well as of high packing fractions. An amorphous tetrahedral network served as a model for the former, while for the latter a model of a metallic glass was used.

ISSN:0031-9104    

DOI:10.1080/00319109608029569

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

摘要:

Recent experimental data by Tang and Surko on the angular and energy dependences of positronium formation in molecular H2has prompted us to bring them into contact with total cross-sections as a function of energy in the energy range up to 125 eV (20 aJ). Data for protons incident on H2are also compared and contrasted with the positron results. Two regimes are delineated: one around the maximum in the total cross-section and the second in the high energy tail. The positron data of Tang and Surko correspond to the tail regime.

ISSN:0031-9104    

DOI:10.1080/00319109608029570

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

摘要:

Experimental solubilities are reported for benzil dissolved in seven binary mixtures containing cyclooctane withn-hexane, n-heptane,n-octane,n-nonane, methylcyclohexane, 2,2,4-trimethylpentane, andtert-butyl-cyclohexane at 25°C. Results of measurements are compared to the predictions of equations developed previously for solubility in systems of nonspecific interactions. The most successful equation in terms of goodness of fit involved a volume fraction average of the excess Gibbs free energies relative to the Flory-Huggins model, and predicted the experimental solubilities in the seven systems studied to within an overall average absolute deviation of 2.1% and with a maximum deviation of 3.6%.

ISSN:0031-9104    

DOI:10.1080/00319109608029571

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

摘要:

Motivated by chemical engineering design purposes, isobaric vapour liquid equilibrium data on two binary mixtures has been obtained. The temperature-mole fraction data were measured in a Swietoslawski ebulliometer.

ISSN:0031-9104    

DOI:10.1080/00319109608029572

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

摘要:

Earlier work has identified the metal ion size RMas a relevant parameter in determining the evolution of the liquid structure of trivalent metal chlorides across the series from LaCI3(RM≈ 1.4 A) to AICI3(RM≈ 0.8 A). Here we highlight the structural role of the chlorines by contrasting the structure of fully equilibrated melts with that of disordered systems obtained by quenching the chlorine component. Man attention is given to how the suppression of screening of the polyvalent ions by the chlorines changes trends in the local liquid structure (first neighbour coordination and partial radial distribution functions) and in the intermediate range order (first sharp diffraction peak in the partial structure factors). The main microscopic consequences of structural quenching of the chlorine component are a reduction in short range order and an enhancement of intermediate range order in the metal ion component, as well as the suppression of a tendency to molecular-type states at the lower end of the range RM.

ISSN:0031-9104    

DOI:10.1080/00319109608029573

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

摘要:

This is a scanned image of the original Editorial Board page(s) for this issue.

ISSN:0031-9104    

DOI:10.1080/00319109608029566

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor