摘要:

The1H-NMR spectra of the liquid binary mixtures, dimethylsulfoxide-acetone, were recorded at 298 K within nearly the whole range of mixed solvent compositions. From these data the values of the spectral parameter, Δδ(DMSO-A) were found. The viscosities (η12) and surface tensions (γ12) of the mixed solvents were measured at 298.15K. From all these new parent data, the values of molar volumes (V12) and their deviations from “ideality” were calculated. Additionally, the values of the temperature coefficients of dielectric permittivity, α12, were found. These structural parameters as functions of concentration suggest the formation of the most stable “complex” (sub-unit) of the DMSO-A type.

ISSN:0031-9104    

DOI:10.1080/00319109508030259

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

摘要:

The quasilattice approximation (QLA) has been applied to study the alloying behaviour of Na-Ga and Na-Sn molten alloys by assuming the formation of complexes of the form Na5Ga8and Na4Sn3. This has been used to obtain the concentration dependence of the free energy of mixing, the long wavelength limit of the concentration-concentration fluctuations and the ordering parameter α1.

ISSN:0031-9104    

DOI:10.1080/00319109508030260

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

摘要:

The interpretation of experiments for very large Na clusters (sizes of a few thousand atoms) suggest that these have icosahedral structures, and that the transition to the bcc structure of the bulk has not yet taken place. We argue here that the reason for this is the fact that the screening cloud around a Na+ion in a finite cluster depends on the cluster size, and even for clusters with about ten thousand atoms it has not yet converged to its bulk form. The same can be said for the effective interionic potential and cluster structure. PACS: 36.40+d 61.50.Lt 61.50.Cj.

ISSN:0031-9104    

DOI:10.1080/00319109508030261

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

摘要:

Simple analytical forms of hard sphere model are presented for atomic transport properties of liquids, that is the self-diffusion coefficient,Ds′and the shear viscosity, η. TheDsand the back scattering factor have been evaluated based on a recent analytical expression ofDsfor hard spheres presented by Speedy, which was obtained by compilingDsdata from many computer simulations for hard spheres. This hard sphere model was applied to test the reliability of recent epoch-making experiment of diffusion in liquids, the measurement ofDsin space for liquid Sn due to Frohberget al.; values ofDsin space are lower than those obtained on earth particularly at higher temperatures than the melting temperature and whose temperature dependence obeys aT2law. The former fact seems to indicate that the previous experimental data ofDsor. earth may be suffered from gravitational (and thermal) convection effects and the latter fact provides some insights into the mechanism of diffusion in liquids.

ISSN:0031-9104    

DOI:10.1080/00319109508030262

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

摘要:

New experimental data for the density and the coefficient of thermal expansion of pure liquid Mn, Fe, Ni, Cu, Al and Sn at temperatures between melting and 1973K using the γ-ray attenuation technique are reported. An extensive study of sources of random and systematic errors has shown a maximum error of 0.75% in absolute density measurements. In the temperature range studied, the density behaves linearly with temperature. The density at the melting point and the coefficient of thermal expansion are in accordance with those of other studies. Comparison of the specific heat ratios γ calculated with the results of this study with those obtained using structural data from diffraction experiments shows large and even non-physical discrepancies, e.g., in the case of Mn. Solid-like viscoelastic behavior in the low-Q region is suggested as a possible cause of such anomaly while shear components would contribute noticeably to reduce the liquid compressibility. It is shown that expansivities of the present study are giving heat capacities at constant volume in the range 3R-4R which is in good accordance with theory predicting 3R as the ionic contribution and about 1R as the electronic contribution. Previously reported data for thermal expansion are giving a wider range of degrees of freedom.

ISSN:0031-9104    

DOI:10.1080/00319109508030263

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

摘要:

Self diffusion coefficients of the Lennard-Jones fluid have been calculated using a model for the force auto-correlation function. Parameters of the proposed model are determined using frequency sum rules of the velocity auto-correlation function. Predicted results for the self diffusion coefficient are found to be in a reasonable agreement with computer simulation data.

ISSN:0031-9104    

DOI:10.1080/00319109508030264

出版商:Taylor & Francis Group    

年代:1995

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:10.1080/00319109508030258

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor