FeSe2 and FeTe2 both crystallize in C-18 Marcasite type orthorhombic structure. We have attempted to substitute tellurium in FeSe2 by solid state reaction method and polycrystalline samples Fe(Se2-xTex) with x=0.2,0.6,1.0,1.4,1.8 were synthesis to study the effect of substituting Te with Se in FeSe2. Phillips X-ray diffractometer is recorded XRD patterned using CuKα radiation into 2θ range of 1...

Confirmation of the suggestion of B site zn2+ in nanocrystalline ZnFe204 has heen sought through X-ray diffraction, 5 7 ~ e Miissbauer spectroscopy, magnetic susceptibility and TEM measurements on bulk and nanocrystalline samples prepared by different techniques. Measurements on bulk samples are in agreement with previously reported ones. Samples prepared at low temperature from solutions of sa...

Iron aluminide FeT2Alz8 was investigated in states with different defect concentrations using the positron annihilation lifetime and Mossbauer spectroscopy methods. The dominant component of 178-187 ps, obtained from positron lifetime spectra analysis, corresponds to a high density of vacancies. In the sample where high concentrations of vacancies or dislocations and vacancy clusters were found...

Mcissbauer spectroscopy is a nuclear i-rav resonance technique that has been extensively tv!i 'iill' s,,'stems. applied to the study of the electronic properties of iron in biological '. The power of the technique lies in its sensitivity to the effects of the physical environment (nature ]18 lw and disposition of ligands, magnetic structure, etc.) on 57Fe nuclei. Moreover, it is sensitive ' onl...

The MnNb(2)O(6)-FeNb(2)O(6) solid solution has been investigated by Fe-K- and Mn-K-edge X-ray absorption (XANES and EXAFS), and Mossbauer spectroscopy. The first-shell M-O bond lengths deduced from EXAFS show a fairly small compositional dependence. A degree of static disorder, which increases with increasing manganese content, is clearly seen by the loss of correlation for the next-neighbour (...

carbon-bearing Ni(II)-femte (CBNF) was prepared by repeated decomposition of CO2 on Hz-reduced Ni(II> femte. The material was also characterized by Mossbauer spectra, XRD and chemical analysis. A peculiar amorphous surface layer composed of carbon, divalent transition metals and oxide ions (CIO layer) was found to be synthesized on the surface of the CBNF. Deposited carbon on the CBNF was chara...

— Biochemists routinely use UV/visible spectrophotometry as a means of identifying and measuring the quantity of many biological compounds. When a new type of compound is isolated however, the method is often unhelpful in determining its chemical nature, and other spectroscopic methods must be used. The iron-sulphur proteins have recently been recognised as major components of bioenergetic syst...

Nanowires from iron were investigated. Samples in the form of arrays parallel threads (wires) obtained by matrix synthesis using track membranes. Matrices with pores 100 nm used, and growth voltage was varied --- 0.8 V, 1 V 1.2 V. Electron microscopic studies samples carried out. The data Mossbauer spectroscopy magnetometry correlate well. Thus, a comparison results these methods showed that an...