ISOLDE Seminar

Structural properties of materials doped with radioactive isotopes

by Adeleh Mokhles Gerami (Institute for Research in Fundamental Sciences (IR))




Recently, the excited nuclei, while inserted into materials, have been delivering important information on the physical properties of those materials. For achieving this information, we have to find the exact position of radioactive ionic probes in the lattice and the nature of defects around probes, which is not possible investigated with conventional characterization techniques. In particular, techniques such as perturbed angular correlation (PAC), and emission Mössbauer spectroscopy are outstanding examples of used experimental methods. They can provide detailed information on phase transition, hyperfine fields, lattice location of radioactive ions in different types of materials. In addition, there are challenges in the understanding of experimental results, therefore using a numerical model based on Density Functional Theory (DFT) calculations combined with conventional characterization and PAC or Mössbauer spectroscopy to support the interpretation of the data. The significant interest in this research encourages academic and industrial centers to construct robust and sophisticated spectrometry measurement facilities rather than conventional offline measurement techniques. One of the big centers that produce different online radioactive isotopes is ISOLDE/CERN for material sciences. In this talk, I will explain about different spectroscopy techniques including Mössbauer and PAC that are used in the GLM beamline direction at ISOLDE, and I will present several examples of using the numerical method to study physics behind ionic probes inside the semiconductors.