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- W3140691080 abstract "This research is a Mossbauer spectroscopic study carried out atroom temperature and down to low temperatures between (20~70° K) forpseudobrookite, Fe2TiO5 and for different series of spinel compounds,MeFe2O4, Me=(Zn, Co, Cu, Ni, ZnCo). Both oxalate precursor and coprecipitationmethods has been used respectively to prepare bothpseudobrookite and spinel series. X-Ray diffraction measurements wereperformed at room temperature in order to verify some structuralproperties of the prepared samples (ca. lattice parameters and grain sizedistribution). In this work it has been shown that the preparationmethodology is crucial in the outcoming magnetic behavior of theobtained materials. Most of the samples behave in a similar way assuperparamagnetic particles with a broad size distribution. This wasespecially observed by Mossbauer spectroscopy showing spectracontaining simultaneously a sextet and a doublet and in which the latterincrease at the expense of the sextet. On one hand, the magnetic behaviorof the pseudobrookite series as obtained from Mossbauer spectroscopywas typical superparamagnetic behavior at room temperature (exhibitinga doublet). This can be attributed to the presence of magnetic clusterswith a wide range of sizes, however the spectra reflect more ionic spinrelaxation and show a sharp transition at 20°K to a sextet, i.e. changefrom paramagnetism to spin glass state order at lower temperature. Onthe other hand, magnetic transition from paramagnetism toantifromagnetic state was observed at 20°K for Zn ferrite samples.Finally, the power of Mossbauer spectroscopy in such kind ofinvestigations has been clearly demonstrated in this work." @default.
- W3140691080 created "2021-04-13" @default.
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- W3140691080 date "2011-01-01" @default.
- W3140691080 modified "2023-09-25" @default.
- W3140691080 title "Mössbauer Effect Study of Some Nano metric Samples Containing Iron" @default.
- W3140691080 hasPublicationYear "2011" @default.
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