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@ARTICLE{Arinicheva:849928,
      author       = {Arinicheva, Yulia and Gausse, Clemence and Neumeier, Stefan
                      and Brandt, Felix and Rozov, Konstantin and Szenknect,
                      Stéphanie and Dacheux, Nicolas and Bosbach, Dirk and
                      Deissmann, Guido},
      title        = {{I}nfluence of temperature on the dissolution kinetics of
                      synthetic {L}a{PO}4-monazite in acidic media between 50 and
                      130 °{C}},
      journal      = {Journal of nuclear materials},
      volume       = {509},
      issn         = {0022-3115},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {FZJ-2018-04024},
      pages        = {488-495},
      year         = {2018},
      abstract     = {Single-phase monazite-type ceramics are discussed as waste
                      forms for the safe disposal of surplus plutonium or
                      separated minor actinides. To gain a deeper insight into the
                      mechanism governing the dissolution of monazite-type
                      compounds, the dissolution kinetics of synthetic
                      LaPO4-monazite was systematically studied by dynamic
                      dissolution experiments carried out in the temperature range
                      from 50 to 130 °C in acidic media (0.01 M HNO3). The
                      dissolution rates at far from equilibrium conditions
                      increased from 3.2 × 10−5 g m−2 d−1 at
                      50 °C to 2.5 × 10−4 g m−2 d−1 at
                      130 °C. Two different temperature regions were observed,
                      in which the normalised dissolution rates of LaPO4 have a
                      diverging temperature dependence, indicating two different
                      mechanisms of dissolution: namely surface-controlled
                      dissolution (T = 50–90 °C;
                      Ea = 44 kJ mol−1) and transport-controlled
                      dissolution (T = 90–130 °C;
                      Ea = 7.5 kJ mol−1). Complementary thermodynamic
                      modelling studies of the dissolution of LaPO4 at the
                      experimental conditions show that La-rhabdophane
                      (LaPO4·0.667H2O) is the thermodynamically favoured
                      phosphate phase in aqueous environments below about
                      100 °C. Apparently, the hydration of monazite and the
                      formation of a thin surface layer consisting of rhabdophane
                      is an intermediate step controlling the dissolution kinetics
                      of the LaPO4 monazite ceramics in low temperature aqueous
                      environments.Keywords},
      cin          = {IEK-6 / IEK-1},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IEK-6-20101013 / I:(DE-Juel1)IEK-1-20101013},
      pnm          = {161 - Nuclear Waste Management (POF3-161)},
      pid          = {G:(DE-HGF)POF3-161},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000442483300054},
      doi          = {10.1016/j.jnucmat.2018.07.009},
      url          = {https://juser.fz-juelich.de/record/849928},
}