The Thermodynamics of Solid Solutions of Ni(II)/Ni(IV) Oxo Compounds

Autor:	Jan Balej, Jiri Divisek
Rok vydání:	1997
Předmět:	Activity coefficient symbols.namesake Nickel Chemistry symbols Thermodynamics chemistry.chemical_element Nernst equation General Chemistry Equilibrium potential Redox Miscibility Solid solution
Zdroj:	Collection of Czechoslovak Chemical Communications. 62:1396-1402
ISSN:	1212-6950 0010-0765
DOI:	10.1135/cccc19971396
Popis:	The measured data of equilibrium and rest potentials of higher nickel oxo compounds, E' (converted for 25 °C and aH2O = aKOH = aH2 = 1.0) selected in the range of the overall oxidation number of 2.0 < zNi ≤ 3.6, were newly evaluated with the aid of a simplified model of the quasi-binary solid solutions Ni(OH)2/Ni(OH)4 assuming unlimited miscibility. It was found that the dependence of E' on the composition of the redox system can be described by a Nernst equation in the entire range of zNi investigated, where the activity coefficients of individual components are expressed by relations for regular solutions. The so calculated activities of considered components showed positive deviations from the ideal behaviour of the solid solutions. All results obtained were discussed in more detail assuming the non-existence of Ni(III) oxo compounds in such solid solutions.
Databáze:	OpenAIRE
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