Density and surface tension of molten alkali halides and their binary mxitures

✍ Scribed by M.V. Smirnov; V.P. Stepanov

• Publisher: Elsevier Science
• Year: 1982
• Tongue: English
• Weight: 905 KB
• Volume: 27
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(82)80082-0

✦ Synopsis

The density and surface tension of molten alkali halides and their binary mixtures with common anions and cations are measured as a function of temperature and ionic composition. The equations are derived for their temperature dependences, with experimental error being given on a confidence level 0.95. The molar volume of the mixtures Is found to deviate from additive quantities towards greater values, the deviation growing as the difference in the size of ions replacing each other increases. The relations of surface tension to molar volume of molten alkali halides were obtained. Their molar excess free surface energy, enthalpy and entropy in the surface monolayer are estimated from experimental data. The surface adsorption of ions in the mixtures is evaluated. It is shown to be governed by the difference in the size of ions substituting each other.