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@PHDTHESIS{Babelot:838895,
      author       = {Babelot, Carole},
      title        = {{M}onazite-type ceramics for conditioning of minor
                      actinides: structural characterization and properties},
      volume       = {182},
      school       = {RWTH Aachen},
      type         = {Dissertation},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek,Verlag},
      reportid     = {FZJ-2017-07401},
      isbn         = {978-3-89336-889-1},
      series       = {Schriften des Forschungszentrums Jülich / Reihe Energie
                      $\&$ Umwelt},
      pages        = {X, 129 S : Ill., graph. Darst},
      year         = {2013},
      note         = {Dissertation, RWTH Aachen, 2012},
      abstract     = {The minor actinides (MA) neptunium, americium, and curium
                      are mainly responsible for the long-term radiotoxicity of
                      the High Active Waste (HAW) generated during thenuclear
                      power operation. If these long-lived radionuclides are
                      removed from the HAW by partitioning and converted by
                      neutron fission (transmutation) into shorter-lived or stable
                      elements, the remaining waste loses most of its long-term
                      radiotoxicity. Thus, partitioning and transmutation $(P\&T)$
                      are considered as attractive options for reducing the burden
                      on geological disposals. As an alternative, these separated
                      MA can also be conditioned $(P\&C$ strategy) in specifically
                      adapted ceramics to ensure their safe finaldisposal over
                      long periods. At the moment, spent fuel elements are
                      foreseen either for direct disposal in deep geological
                      repositories or for reprocessing. The highly activeliquid
                      waste that is produced during reprocessing is conditioned
                      industrially using a vitrification process before final
                      disposal. Although the widely used borosilicate glassesmeet
                      most of the specifications needed, ceramic host matrices
                      appear to be even more suitable in terms of resistance to
                      corrosion. The development of new materials based on
                      tailor-made highly specific ceramics with extremely stable
                      behavior would make it possible to improve the final storage
                      of long-lived high-level radiotoxic waste.In the framework
                      of this PhD research project, monazite-type ceramics were
                      chosen as promising host matrices for the conditioning of
                      trivalent actinides. The focus on themonazite-type ceramics
                      is justified by their properties such as high chemical
                      durability. REPO$_{4}$ ceramics are named monazite for RE =
                      La - Gd (monoclinic symmetry) and xenotime for RE = Tb - Lu
                      and Y (tetragonal symmetry). The objective of this study is
                      to contribute to the understanding of the alteration
                      behavior of such ceramics under the repository conditions.
                      REPO$_{4}$ (with RE = La, Eu) is prepared by hydrothermal
                      synthesis at 200°C. Structural and morphological
                      characteristics (using X-ray diffraction (XRD) and scanning
                      electron microscope (SEM)) combined with physical and
                      thermal properties of samples (using thermogravimetry,
                      differential scanning calorimetry (TG-DSC) and dilatometry)
                      are realized in order to study the behavior of monazite-type
                      powder and pellets. The access to short-range-order
                      spectroscopy (time resolved laser fluorescence spectroscopy
                      (TRLFS) and extended X-ray absorption fine structure
                      (EXAFS)) permits to [...]},
      keywords     = {Monazit (gnd)},
      cin          = {IEK-6},
      ddc          = {500},
      cid          = {I:(DE-Juel1)IEK-6-20101013},
      pnm          = {899 - ohne Topic (POF3-899)},
      pid          = {G:(DE-HGF)POF3-899},
      typ          = {PUB:(DE-HGF)3 / PUB:(DE-HGF)11},
      url          = {https://juser.fz-juelich.de/record/838895},
}