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@ARTICLE{Finkeldei:904124,
      author       = {Finkeldei, Sarah C. and Chang, Shirley and Ionescu, Mihail
                      and Oldfield, Daniel and Davis, Joel and Lumpkin, Gregory R.
                      and Simeone, David and Avdeev, Max and Brandt, Felix and
                      Bosbach, Dirk and Klinkenberg, Martina and Thorogood, Gordon
                      J.},
      title        = {{I}nsight {I}nto {D}isorder, {S}tress and {S}train of
                      {R}adiation {D}amaged {P}yrochlores: {A} {P}ossible
                      {M}echanism for the {A}ppearance of {D}efect {F}luorite},
      journal      = {Frontiers in Chemistry},
      volume       = {9},
      issn         = {2296-2646},
      address      = {Lausanne},
      publisher    = {Frontiers Media},
      reportid     = {FZJ-2021-05694},
      pages        = {706736},
      year         = {2021},
      abstract     = {We have examined the irradiation response of a titanate and
                      zirconate pyrochlore—both of which are well studied in the
                      literature individually—in an attempt to define the
                      appearance of defect fluorite in zirconate pyrochlores. To
                      our knowledge this study is unique in that it attempts to
                      discover the mechanism of formation by a comparison of the
                      different systems exposed to the same conditions and then
                      examined via a range of techniques that cover a wide length
                      scale. The conditions of approximately 1 displacement per
                      atom via He2+ ions were used to simulate long term waste
                      storage conditions as outlined by previous results from
                      Ewing in a large enough sample volume to allow for neutron
                      diffraction, as not attempted previously. The titanate
                      sample, used as a baseline comparison since it readily
                      becomes amorphous under these conditions behaved as
                      expected. In contrast, the zirconate sample accumulates
                      tensile stress in the absence of detectable strain. We
                      propose this is analogous to the lanthanide zirconate
                      pyrochlores examined by Simeone et al. where they reported
                      the appearance of defect fluorite diffraction patterns due
                      to a reduction in grain size. Radiation damage and stress
                      results in the grains breaking into even smaller
                      crystallites, thus creating even smaller coherent
                      diffraction domains. An (ErNd)2(ZrTi)2O7 pyrochlore was
                      synthesized to examine which mechanism might dominate,
                      amorphization or stress/strain build up. Although strain was
                      detected in the pristine sample via Synchrotron X-ray
                      diffraction it was not of sufficient quality to perform a
                      full analysis on.},
      cin          = {IEK-6},
      ddc          = {540},
      cid          = {I:(DE-Juel1)IEK-6-20101013},
      pnm          = {1411 - Nuclear Waste Disposal (POF4-141)},
      pid          = {G:(DE-HGF)POF4-1411},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {34858941},
      UT           = {WOS:000725564300001},
      doi          = {10.3389/fchem.2021.706736},
      url          = {https://juser.fz-juelich.de/record/904124},
}