Results 1 - 10 of 2049
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[en] The possibility of monitoring structure homogeneity has been studied by the method of Mössbauer spectroscopy with a resonance detector on the example of beryllium alloys, containing from 0.09 to 0.8 wt.% iron and other metallic impurities with a total amount of 0.04 to 0.14 wt.%. The quality of the obtained spectra description has been improved using methods which have a different degree of complexity and effectiveness.
[en] The characteristics of the optical storage in recording and erasing processes by holographic method were studied for the Fe doped and undoped LiNbO3 crystal using Ar-ion laser (4880A). The diffraction efficiencies during the recording and erasing processes were measured. The measured data were analysed and discussed using the known theory. The effects of Fe ion concentration, sample reduction treatment, bean polarization and externally applied electric field on the recording and erasing characteristics were studied. (Author)
[en] The C60:Fe compounds were investigated by means of the Moessbauer spectroscopy. They proved that iron can adopt two different states in the compound, probably differing also in the position of the metal ions. The Moessbauer parameters characterising one of the states are similar to these of ferrocene, thus indicating similar spatial arrangement of Fe and neighbouring carbons. It leads to the conclusion that iron binds in a complex C60FeC60. (author). 11 refs, 8 figs, 2 tabs
[en] The bulk photovoltaic effect that arises in non centrosymmetric crystals is determined by the third rank tensor. In this work four independent components of photovoltaic tensor, responsible for 'linear' photovoltaic currents, are measured for the first time for LiTaO3 : Fe crystals in the range of photon energy from 2.07 to 3.88 eV. The observed correlation of the spectral dependences of β15 and β22 components indicates common origin of the transverse photovoltaic currents in this material