Search results for "Vivianite"

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Conversion electron Mössbauer study of vacuum and thermally treated vivianite

1990

Natural vivianite samples were studied by Mossbauer transmission and conversion electron spectroscopy. The intensities of ferrous doublets in vivianite and the widths of the resonance lines depend strongly on the origin of the samples, on their preparation history, and on exposures in vacuo as well as on thermal treatments. An additional ferrous doublet appearing in samples after vacuum treatment can be ascribed to a tetrahydrate phosphate phase appearing at the surface due to dehydration. Heating at 413 K in dry air for periods of 15–240 min causes a higher oxidation and decomposition rate at the surface region than in the bulk of vivianite. All results do not confirm the assumption publis…

Nuclear and High Energy PhysicsTetrahydrateChemistryAnalytical chemistryResonanceCondensed Matter PhysicsElectron spectroscopyDecompositionAtomic and Molecular Physics and OpticsFerrouschemistry.chemical_compoundNuclear magnetic resonancePhase (matter)Mössbauer spectroscopyVivianitePhysical and Theoretical ChemistryHyperfine Interactions

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