This paper considers the application of surface-analytical techniques to characterize both thin (-2 nm) passive oxide films and thick (up to 1 pm) oxides formed on metals and alloys a t high temperature. Auger electron spectroscopy (AES), X-ray photoelectron spectroscopy (XPS), Mossbauer spectroscopy, X-ray absorption near edge spectroscopy (XANES), secondary ion mass spectrometry (SIMS) and el...

The effects of Ni$^{2+}$ substitution on the structure (lattice parameters, cations distribution, average radii, cation-cation/anion bond lengths and angles) soft magnetic properties Mg$_{1-x}$Ni$_x$Fe$_2$O$_4$ ($0 \le x 1.0$) nanocrystals have been studied by x-ray diffraction with Rietveld refinement, transmittance electron microscopy, Mossbauer spectroscopy magnetization measurements. mostly...

The central shift of 57Fe atoms with trapped interstitials (mixed dumbbells) in aluminium increases steeply at temperatures between 10 and 20 K. Influences of restricted diffusion of the Mossbauer atom in a cage on the isomer shift and second order Doppler shift are discussed.

We have analysed in terms of static hyperfine field distributions the Mossbauer spectra of mixed Zn-Mg ferrites. Typical features of semi-spin glasses are observed both in average and locally: in each sample, the relevant data are smeared out in a way which reveals the behavior of the series.

A previously undescribed magnetotactic spirillum isolated from a freshwater swamp was mass cultured in the magnetic as well as the nonmagnetic state in chemically defined culture media. Results of Mossbauer spectroscopic analysis applied to whole cells identifies magnetite as a constituent of these magnetic bacteria.

The conversion of magnetite to maghemite has been studied kinetically in the ultrafine particle range (77-220A) by chemical analysis. X-ray diffraction, and Mossbauer measurements. The reaction is third order. The activation temperatures are relatively low (8 250-1 1 200 K). Electron hopping in ultrafine magnetite powders is discussed on the basis of the results.