Reactions of liquid sodium with transition-metal oxides. Part IV. Oxides of iron, cobalt, nickel, and copper
The oxides of iron, cobalt, nickel, and copper are reduced by liquid sodium directly to the metal and sodium oxide. Only in the case of iron is a ternary oxide formed in the presence of an excess of liquid sodium. Solid-state reactions between sodium monoxide and the transition metals, carried out in vacuo, showed that reaction occurs at temperatures above 390°(Fe), 440°(Co), 480°(Ni), and 290°(Cu).