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@ARTICLE{Korte:893386,
      author       = {Korte, Carsten and Franz, Bernhard},
      title        = {{R}eaction kinetics in the system {Y}2{O}3/{A}l2{O}3 –
                      {A} solid state reaction forming multiple product phases
                      investigated by using thin film techniques},
      journal      = {Solid state ionics},
      volume       = {368},
      issn         = {0167-2738},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {FZJ-2021-02727},
      pages        = {115699 -},
      year         = {2021},
      abstract     = {The kinetics of the heterogeneous solid state reaction
                      between Al2O3 and Y2O3 is investigated by using thin film
                      techniques. Y2O3 films are grown by means of pulsed laser
                      deposition (PLD) on single crystalline alumina substrates
                      with a (0001) orientation. The solid state reactions are
                      performed at a temperature of 1400 °C (1673 K). The cross
                      sections of the reacted samples were investigated by means
                      of SEM and XRD and exhibit a sequence of three product
                      layers, Y3Al5O12 (YAG), YAlO3 (YAP) and Y4Al2O9 (YAM). The
                      simultaneous growth of the product layers is controlled by a
                      diffusional kinetics and the thickness increases are coupled
                      to each other. According to Wagner and Schmalzried, one has
                      to distinguish between rate constants of the first kind
                      (“practical” Tammann constant), in the case of
                      simultanous and coupled growth of multiple product phases,
                      and rate constants of the second kind (“true” Tammann
                      constant), in the case of the uncoupled and only growth of
                      one product phase in equilibrium with the adjacent phases.
                      The growth kinetics for a solid reaction forming three
                      product phases (layer) is analysed in detail using linear
                      transport theory. For the formation of YAG, YAP and YAM the
                      rate constants of the second kind are determined from the
                      experimental data and those of the first kind are calculated
                      and compared to the available literature data. Based on
                      these considerations, a detailed overview about the phase
                      formation kinetics in the temperature range of 1200–1400
                      °C can be given for the first time. The (Nernst-Planck
                      coupled) cation conductivities are calculated.},
      cin          = {IEK-14},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IEK-14-20191129},
      pnm          = {1231 - Electrochemistry for Hydrogen (POF4-123)},
      pid          = {G:(DE-HGF)POF4-1231},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000681039300012},
      doi          = {10.1016/j.ssi.2021.115699},
      url          = {https://juser.fz-juelich.de/record/893386},
}