Effective iron moments

The magnetic properties of Fe-Al gismondine were studied the effective iron moments varied between 5.71 pe (14.6 % Fe) and 5.41 pe (22.7 % Fe) [08K1]. The magnetic data confirmed the substitution of A1 for Fe in gismondine framework. 

From the effective iron moments, the mean spin values, S, were computed according to the relation M jj(Fe) = gFe p( p + 1) (Burzo et al. 1985d). The 5p values thus determined are listed in table 6. These are somewhat greater than the spin values, S, obtained from the mean saturation iron moments. 

Fig. 1. Plot of effective magnetic moment vs. iron-sulfur bond length in [FeCRidtcls] complexes.

The inverse magnetic susceptibility and the effective magnetic moment, jueff, of [Fe(HC(3,5-(CH3)2pz)3)2](BF4)2 are shown in Fig. 16 where it is immediately obvious that the magnetic properties of this complex are quite unusual [46]. Above ca. 210 K the eff of ca. 5.0 is clearly that expected of a high-spin iron(II) complex. But below ca. 190 K the moment decreases to a substantially lower value of ca. 3.7 /uB. Further, at ca. 90 K there is a small irreversible change in susceptibility and moment, a change that is associated with crystal reorientation in the applied field. The reason for the abrupt decrease in the moment at ca. 200 K to ca. 3.7 becomes apparent from a study of the Mossbauer spectra of [Fe(HC(3,5-(CH3)2pz)3)2](BF4)2. 

The saturation magnetisation of iron is 1.752 X 10 Am Calculate the effective magnetic moment on an iron atom. Iron adopts the A2 stmcture with a unit cell edge of 0.2867 nm. 

The unusual structure of [( PDAl)Fe]2 presented a unique opportunity to study electronic communication between two iron centers bearing redox-active bis(aldimino)pyridine pincer Hgands. Variable-temperature solid-state magnetic susceptibihty measurements established an essentially invariant effective magnetic moment of 4.3 pg between 100 and 300 K. Below 100 K, decreases monotonically... 

Fig. 2.30 Mean effective magnetic moment per atom versus iron cluster size at T = 120 K [57]...

Seh] Mdssbauer effect / magnetic moment on Fe in ternary alloys Co-Fe-Ni Co concentration dependence of the magnetic moment of iron... 

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