Silver magnetic susceptibility

The disappearance of the paramagnetism of palladium-silver alloys (rich in Pd) when the ratio (H + Ag)/Pd = 0.6 (24) illustrates that the effect of both these alloying" elements in palladium is additive and each one contributes essentially in the same way to the change of magnetic susceptibility of palladium. 

Complexes related to CoHg(SCN)4, the well-known calibrant used in magnetic susceptibility measurements, have recently been prepared containing silver(I).146,147a In the presence of a number of Lewis bases octahedral adducts such as Co[Ag(SCN)2] -2DMF were obtained. Magnetic moments indicated the presence of high-spin cobalt(II). With nickel(II), two types of complex... 

The determination of n from measurement of peff is the most familiar application of magnetic susceptibility measurements to inorganic chemists. To the extent that the spin-only formula is valid, it is possible to obtain the oxidation state of the central atom in a complex. Thus an iron complex with a peff of 5.9B.M. certainly contains Fe(III) (high-spin d5) and not Fe(II). The diamagnetism of AgO rules out its formulation as silver(II) oxide, because Ag2+ has an odd number of electrons (d9) and should be paramagnetic it contains Ag(I) and Ag(III), in equal amounts. There are, however, a number of pitfalls, especially if reliance is placed on a single measurement at room temperature. The Curie law is rarely obeyed within the limits of experimental error. This means that the measured peff is somewhat temperature-dependent. A number of factors can be responsible for deviations from ideal Curie (or even Curie-Weiss) behaviour, and/or from the spin-only formula. 

For X < 0.4, the magnetic susceptibility is temperature dependent like that of pure palladium, but it has lower values. For x > 0.6, this temperature dependence disappears and the system is diamagnetic (60), like that of silver, a neighbor of Pd in the periodic table. This change is related to a change in position of the Fermi level with respect to the d-band. For low X the Fermi level crosses the d-band, as in pure Pd (cf. Fig. 9) at x 1, Ef is above the d-band (Fig. 21a) (61). When the H/Pd ratio increases, the total DOS at Ef (and therefore the susceptibility) decreases, but it is calculated that the LDOS at Ef on the hydrogen site should increase (62) (Fig. 21b). 

More complicated aggregate structures are found in the vanadium-copper and vanadium-silver species [ViMiS SPh CR ]" (M = Cu or Ag) (133), in which the metal sulfido core is in the shape of a cube [Fig. 14(d)] bulk magnetic susceptibility measurements have shown that there is probably a direct V —V bond within these species. These and related complexes are of interest since a vanadium-containing nitrogenase has been discovered (136). 

Dysprosium is a metal with bright silver luster, relatively stable in air at room temperature. The element has a very high magnetic susceptibility, which means that it is markedly paramagnetic. For dysprosium there are only few applications. One important is its use, together with terbium, in magnetostrictive materials. 

---