Heats of Mixing in Liquid Alkali Nitrate Systems

Autor:	L. S. Hersh, O. J. Kleppa
Rok vydání:	1961
Předmět:	Lattice energy Enthalpy Inorganic chemistry General Physics and Astronomy Thermodynamics Alkali metal Mole fraction Enthalpy of mixing k-nearest neighbors algorithm chemistry.chemical_compound Nitrate chemistry Physical and Theoretical Chemistry Mixing (physics)
Zdroj:	The Journal of Chemical Physics. 34:351-358
ISSN:	1089-7690 0021-9606
DOI:	10.1063/1.1700955
Popis:	The enthalpies of mixing in binary liquid alkali nitrate systems have been measured, and are all negative. It is found that the magnitude of the molar mixing enthalpy (ΔHM) increases in a regular fashion with increasing difference in size between the two participating cations, according to the following approximate relation ΔHM≅−X(1−X)U[(d1−d2)/(d1+d2)]2. Here X and (1—X) are the mole fractions of the two components, U is the lattice energy of the mixture, while d1 and d2 are the interionic distances characteristic of the two pure components. The results are in accord with the view that in these systems the principal source of the enthalpy of mixing is the reduction in Coulombic repulsion between the second nearest neighbor cations. For binary systems with negative enthalpies of mixing of the order of RT there is evidence for short‐range order among the cations.
Databáze:	OpenAIRE
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