The Mossbauer spectra of Fe in Fe3 _ xVx Si alloys for 0.,;; x";; I shows that V occupies almost exclusively one of two Fe sites (the B site). As x increases the spectra of Fe on the other site (the A, C site) becomes increasingly complex as the number of their V 1st neighbors increases. Simulated Mossbauer spectra were calculated using moments obtained by a simple model from bulk magnetization...

A charge ordering phenomenon within the crystallographic sites as following Sr4(Fe0.143+Co0.363+)48h(Fe0.114+Co0.144+Co0.253+)48fO10.52 was previously reported thanks to neutron diffraction coupled with Mossbauer spectroscopy studies. Such distribution supports a natural magnetic layered structure combining both in-plane ferromagnetic super-exchange interactions mainly on octahedron “8 f” sub-l...

Introduction: An enigma of Venusian mineralogy is the suggestion that Fe3+bearing minerals exist under the reducing conditions of the Venusian atmosphere. Analysis of the spectrophotometric data from the Venera 13 and 14 missions, combined with the laboratory reflectance spectral measurements of oxidized basalts at elevatedtemperatures, led to the suggestion that metastable hematite might exist...

Pyruvate formate lyase activating enzyme is a member of a novel superfamily of enzymes that utilize S-adenosylmethionine to initiate radical catalysis. This enzyme has been isolated with several different iron-sulfur clusters, but single turnover monitored by EPR has identified the [4Fe-4S](1+) cluster as the catalytically active cluster; this cluster is believed to be oxidized to the [4Fe-4S](...

The concepts of source and quantum action principle are used to produce the phonon Green's function appropriate for an initial phonon vacuum state. An application to the Mossbauer effect is presented.

A study of the Mossbauer effect of Fe in magnetic materials subjected to high pressures is described. Specific systems reviewed are FeF2 , ct, s and -y phases of iron, invar, stainless steel and a metallic glass.

An extension of the online implantation chamber used for emission Mossbauer Spectroscopy (eMS) at ISOLDE/CERN that allows quick removal samples offline low temperature studies is briefly described. We demonstrate how eMS data obtained during temperatures between 300 K and 650 short-lived parent isotopes combined with rapid cooling measurements decay isotope can give detailed information on bind...