Mössbauer Studies of Divalent and Trivalent 57Fe in CoSO4 and CoSO4·7H2O

Abstract

We report the results of a Mössbauer study of 57Co(57Fe) in CoSO4 as a function of temperature at atmospheric pressure and as a function of pressure at room temperature. In addition to the expected divalent 57Fe component, one also observes a trivalent component, the relative intensity of which decreases with increasing temperature or pressure. The isomer shifts of both charge states also decrease with increasing temperature or pressure. The behavior of the large quadrupole splittings observed in each charge state is analyzed using the crystal field approximation. We also find similar results in a temperature study of CoSO4·7H2O at atmospheric pressure. The relative intensity of the trivalent 57Fe component is considerably greater in the hydrate and also decreases with increasing temperature.

High-Pressure Moessbauer Studies on Iron and Its Dilute Alloys.

“…The interaction Hamiltonian is r= -11.H lines are properly shown in Figure 3a and since |SE| < | G| the (75) lines as numbered in Figure 3a are in terms of decreasing energy. The same lines are shown in Figure 3b as they appear in a typical 57 run using a single line absorber with a Fe in an iron source.…”

“…it is clear that one obtains the same shift for fm . This is shown 57 in Figure 4 for Fe where 2/ AE = '2,Q (1 + ,) (41) for the I = 3/2 excited state.…”

“…The Ni plating was necessary to keep the stainless steel 38 57 gives an isomer shift of 1 -0.15 mm/sec with respect to Fe in iron. This agrees well with the value of Kitchens et al· (84) b) Absorbers 57 2 In the f number study an enriched 'Fe 1.00 mg/cm Na4Fe(CN)6'10H20 absorber was used.…”

“…heat measurements is also seen here. The values of <W > for The pressure dependence of the M8ssbauer isomer shift for 57 Fe in iron, copper, vanadium, and titanium was studied. An 'D analysis of the data gives a relation between the isomer shift cantly lower than the former number.…”

Mössbauer Study on the Aftereffects of Nuclear Decay in Sulphate Hydrates

“…of Fe^"^ is smaller than that of the heptahydrate, which can also be explained by the INGALLS' model [1,14]. A central metallic ion in the monohydrates has two SO4" and two H^O ligands [15], and therefore the environment of the central ion is fairly distorted, compared with that of the heptahydrates, which results in the smaller Q. S. of Fe^ Unlike the heptahydrates, the Q. S. of Fe^ ^ is rather smaller than that of Fe^ *.…”