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- W2020294617 abstract "Metal-ammonia solutions (MAS) pass with increasing metal concentration through a nonmetal-metal transition (NMT). Determination of the ammonia vapour pressure of sodium-ammonia solutions around — 40°C and its temperature dependence and application of the Gibbs-Duhem equation lead to the chemical potentials and the partial molar enthalpies and entropies of both components. Whereas the chemical potentials are almost concentration independent in the concentration range of the NMT, the other partial molar quantities display pronounced extrema. The evaluation of the data leads to the conclusions: a) the NMT is accompanied by an increase of enthalpy and entropy of the dissolved metal, due to the transition of the electrons from the solvated to the free state; b) the NMT is favoured by temperature increase; c) the miscibility gap at lower concentrations is a consequence of the NMT.Metall-Ammoniaklosungen (MAS) durchlaufen mit steigender Metallkonzentration einen Nichtmetall-Metallubergang (NMT). Durch Messung des Ammoniakdampfdruckes der Natrium-Ammoniaklosungen sowie seiner Temperaturabhangigkeit im Bereich um −40°C und mit Anwendung der Gibbs-Duhem-Beziehung werden die chemischen Potentiale und die partiellen molaren Enthalpien und Entropien beider Mischungskomponenten bestimmt. Wahrend die chemischen Potentiale im Bereich des NMT nahezu konzentrationsunabhangig sind, laufen hier die anderen partiellen molaren Grosen durch ausgepragte Extrema. Aus den Daten folgt: a) Der NMT ist mit einer Zunahme der Enthalpie und der Entropie des gelosten Metalls verbunden, die auf die Energieaufnahme bei der Uberfuhrung der Elektronen aus dem gebundenen in den freien Zustand bzw. die damit verbundene Zunahme an Bewegungsfreiheit der Teilchen zuruckgeht, b) der NMT wird mit zunehmender Temperatur begunstigt, c) die Mischungslucke bei tiefen Temperaturen ist eine Konsequenz des NMT." @default.
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- W2020294617 date "1977-10-01" @default.
- W2020294617 modified "2023-09-27" @default.
- W2020294617 title "Thermodynamics of the Nonmetal-Metal Transition of Sodium-Ammonia Solutions" @default.
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- W2020294617 doi "https://doi.org/10.1002/bbpc.19770811026" @default.
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