Localized Magnetic Moments and Pauling Valence in Manganese Metal, Some 3d-Transition Alloys and Intermetallic Compounds

The dependence of magnetic moments localized at manganese atomic site on crystalline environment is discussed by using the concept of the Pauling valence which is defined by the relation between the atomic radius and the interatomic distance from neighbouring atoms. The linearlity of the magnitude of magnetic moments and the Pauling valence at individual manganese atomic site is found. It is concluded that the localized magnetic moment is mainly affected by kinds of nearest neighbour atoms and the coordination number. From this result, it is suggested that the covalency effect plays an important role in determining the magnitude of the magnetic moment assosiated with the manganese atomic site. Magnetic moments in σ-phase Fe-V alloys whose crystal structure is similar to that of α-Mn are also discussed.