Stability of ferrous oxide in molten liCl+KCl eutectic at 470°C

Studies of reactions between oxide and Fe²⁺ ions in molten LiCl+KCl eutectic have shown that ferrous oxide is stabilizedin the form of a solid solution FeOLiFeO₂. Potentiometric titrations with an yttria-stabilized zirconia electrode(indicator of pO^2?) and an iron electrode have first given for y, corresponding to the solid solution composition Fe_1-yLi_yO, a value between 0 and 0.1, and secondly shown the formation of non-stoichiometric ferrous oxide. We have alsosuggested a mechanism for the formation of the solid solution Fe_1-yLi_yO.