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@ARTICLE{Sergeev:885652,
      author       = {Sergeev, D. and Yazhenskikh, E. and Haseli, P. and Liu, M.
                      and Ziegner, M. and Bruno, F. and Müller, Michael},
      title        = {{E}xperimental study of thermodynamic properties and phase
                      equilibria in {N}a2{CO}3–{K}2{CO}3 system},
      journal      = {Calphad},
      volume       = {71},
      issn         = {0364-5916},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {FZJ-2020-03983},
      pages        = {101992 -},
      year         = {2020},
      abstract     = {Sodium and potassium carbonates and their mixtures are
                      important for different applications, e.g. for latent
                      thermal energy storage, die-casting processes and molten
                      carbonate fuel cells. In this work the phase diagram and
                      thermodynamic properties of Na2CO3–K2CO3 system were
                      studied by differential thermal analysis, differential
                      scanning calorimetry and high temperature X-ray diffraction.
                      Three carbonate mixtures (56, 25 and 75 $mol\%$ of Na2CO3)
                      have solid-solid transition in a wide temperature range
                      between 648 K and 823 K. The high temperature XRD analysis
                      has shown that this transition is a continuous process of
                      changing of the unit cell volume without structural changing
                      of the hexagonal lattice. This phenomenon has also been
                      observed on the measured heat capacity curves. The obtained
                      experimental results were compared with calculations
                      performed using the previous thermodynamic datasets. The
                      comparison of these results shows that further
                      thermochemical assessment of this system needs to be
                      performed to achieve better agreement with the available
                      experimental data.},
      cin          = {IEK-2 / PGI-9},
      ddc          = {540},
      cid          = {I:(DE-Juel1)IEK-2-20101013 / I:(DE-Juel1)PGI-9-20110106},
      pnm          = {113 - Methods and Concepts for Material Development
                      (POF3-113)},
      pid          = {G:(DE-HGF)POF3-113},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000589922300009},
      doi          = {10.1016/j.calphad.2020.101992},
      url          = {https://juser.fz-juelich.de/record/885652},
}