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The formation of lithiated Ti-doped alpha-Fe2O3 nanocrystalline particles by mechanical milling of Ti-doped lithium spinel ferrite
The milling of spinel-related Ti-doped Li0.5Fe2.5O4 for different times is studied with XRD, Mossbauer spectroscopy and magnetic measurements. Milling converts the material to Li-Ti-doped alpha-Fe2O3 nanocrystalline particles via an intermediate gamma-LiFeO2-related phase. The role played by the dopant Ti-ion in the process is emphasized
Cation Distribution in Natural Chromites from Oman
Two specimens or natural chromite from the Oman ophiolite were studied using Mossbauer Spectroscopy (MS), X-ray Diffraction (XRD). and Scanning Electron Microscopy (SEM). The diffraction patterns obtained at room temperature showed that the two specimens have a face-centered cubic spinal structure. Their Mossbauer spectra at 295 K. 160 K and 78 K have been fitted to three doublets. assigned to two Fe 2+ at the tetrahedral (A1+,A2) sites and one Fe1+ at the octahedral (B) site. The ferrous-ferric ratio obtained from the Mossbauer analysis together with the atomic concentration derived from the microprobe data are used to derive the chemical formulae for the two specimens. The data also supports also supports a model of ordered caution distribution in the specimens examined