MOSSBAUER STUDY OF SPIN-SPIN RELAXATION OF FE-3+ IONS IN THE PRESENCE OF OTHER PARAMAGNETIC-IONS

Mössbauer spectroscopy has been used to study the influence of paramagnetic ions, viz. Cu2+, Cr3+, Co2+ Mn2+, Gd3+ and Dy3+ on the spin-spin relaxation time of Fe3+ ions in amorphous frozen aqueous solutions. It is found that these ions shorten the relaxation time, but the effect is much smaller than suggested earlier on the basis of measurements of relaxation of Fe3+ in an α-Al2O3 matrix. It is also found that S-state ions have a greater influence on the relaxation time than other paramagnetic ions. The spectra obtained in presence of S-state impurity ions could only be fitted by allowing the individual transition probabilities to vary independently. © 1979.