Thermochemical properties of gaseous EuO

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Abstract
The dissociation energy of gaseous europium monoxide, D0° (EuO) has been measured mass spectrometrically using three independent isomolecular equilibria: Eu(g)+AlO(g) =EuO(g)+Al(g), (1) Eu(g)+BaO(g) =EuO(g)+Ba(g), (2) Eu(g)+TiO(g) =EuO(g)+Ti(g). (3) These equilibria yield D°0(EuO) =111.9±2.4 kcal/mol (or 4.85±0.10 eV), from which is derived a value of ΔHf° (EuO, g, 298.15 K) =−11.6±2.4 kcal/mol. Previous measurements of D°0(EuO) are reinterpreted and discussed in view of this work. The ionization potential of EuO was measured and found to be 6.3±0.2 eV.