MS/Mössbauer Spectroscopy
Mössbauer spectroscopy, MS, is a powerful method for the investigation of the physical and chemical properties of materials. It uses nuclear isotope probes such as 57Fe and 119Sn to obtain atomic-level information on materials which either contain these elements or are doped with the appropriate isotopes.
Valuable data on the valence state, coordination and magnetic state of these elements can be derived. Moreover, morphological, structural, and magnetic characteristics of the materials can also be extracted through the analysis of spectra collected across a range of different conditions, including cryogenic temperatures and external magnetic fields. Especially for nanostructured materials, the technique can provide unique experimental data that can resolve significant questions concerning states and interactions at the atomic, molecular or nanoparticle level.
MS requires a relatively small amount of sample, usually in the range of a few tens of mg, depending on the concentration of the resonant isotope in the material. Samples should be in the solid state, in the form of fine powder, although liquid solutions can also be measured after freezing. In special cases samples of single crystals, foils and films can also be successfully measured.
Mössbauer Spectrometers in transmission geometry
57Fe & 119Sn
Valence state and coordination of resonant isotopes.
Magnetic character of resonant isotopes.
Phase(s) identification containing the resonant isotopes for the material in study.
Morphological, structural, electronic and magnetic properties/characteristics of the phases containing the resonant isotopes for the material in study.
Typical: fine powder.
Special cases: frozen solutions, single crystals, foils, films.
Typical: room temperature and 77 K.
Common: 10 K to 300 K.
Special: 300 K to 650 K.
Mössbauer spectrometer with applied magnetic fields up to ~ 1 T, at sample temperatures between 77 K and 300 K in transmission geometry.
Conversion Electron, Χ-ray and γ-ray backscatter emission Mössbauer spectrometer for film and foil surface measurements at 300 K.
Alexios Douvalis (adouval@uoi.gr)
Mössbauer Spectrometers in transmission geometry. Conversion Electron Spectroscopy for the study of surfaces (200nm depth).
57Fe & 119Sn
Valence state and coordination. Phase identification. Morphological and microstructural characterisation. Magnetic characterisation.
Applications to magnetic materials, pharmaceuticals, nanomaterials, superconducting materials, molecular magnetic materials, biomaterials, minerals and mineral processing, metallurgical and corrosion studies.
Typical: fine powder.
Special cases: frozen solutions, single crystals, foils, films.
Typical: 1.5K to 300K
Applied magnetic fields up to ~ 1 T at temperatures between 1.5 K and 300 K in transmission geometry.
Eamonn Devlin (e.devlin@inn.demokritos.gr),
Yiannis Sanakis (i.sanakis@inn.demokritos.gr)
