TWO IRON NITRIDES

Abstract

1. The heat of formation of Fe4N was determined by means of calorimeter.2. The molecular heats of Fe2N and Fe4N were calculated by applying the Neumann and Kopp’s law and obtained the equilibrium equations of the systems: Fe, Fe4N, NH3, H2 and Fe4N, Fe2N, NH3, H2 from the observed heat of formation of Fe4N by using the Nernst’s heat theorem. The calculated values by these equations agree well with the equilibrium data obtained at high temperatures.3. Various iron nitrides were prepared and their compositions were accurately determined by X-ray.4. The electrochemical properties of the iron nitrides were studied and the passive state of iron nitride was made clear.5. The reversible property of the iron nitride cell was examined.