Hyperfine splitting of 57Fe 3+ Mössbauer spectra in diamagnetic host lattices

Abstract

The Mössbauer spectra of 57Fe 3+ substituted in 0.2 to 0.4 atom % of the octahedral sites in the host lattices Na 0.9Mg 0.45Ti 1.55O 4, TiO 2, Sc 2O 3, LiScO 2 and MgAl 2O 4 have been examined. Hyperfine splittings of the spectra were observed for all cases except Sc 2O 3. In all cases the electron spin resonance spectrum was found, or has been shown to be highly anisotropic as a result of the presence of strong axial or rhombic fields and consequent splitting of the 3 d 5 ground state energy levels. In several cases resolution of the ± 5 2 and ± 3 2 Mössbauer spectra was observed. Mössbauer spectra of the solid solutions Na 0.9Mg 0.45Ti 1.55O 4Na 0.9Fe 0.9Ti 1.1O 4, LiScO 2LiFeO 2 and TiO 2FeNbO 4 have also been examined.