The reactions of sodium oxide with iron and its oxides are studied at 500–600 °C. Under pressures of sodium vapour close to saturation, a double oxide FeO(Na2O)2 is formed. The standard enthalpy of combination of this compound from its constituent oxides is found by solution calorimetry: ΔH°298=–25·07 ± 0·55 kcal mol–1(–104·9 ± 2·3 kJ mol–1).
P. Gross and G. L. Wilson, J. Chem. Soc. A, 1970, 1913 DOI: 10.1039/J19700001913
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