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@ARTICLE{Sergeev:1040881,
      author       = {Sergeev, D. and Nénert, G. and Rapp, D. and Beckstein, F.
                      and Schöneich, M. and Müller, M. and Gertenbach, J.},
      title        = {{C}omprehensive analysis of thermophysical properties of
                      the {N}a{NO}3–{KNO}3 mixture with metastable phases},
      journal      = {Journal of materials research and technology},
      volume       = {36},
      issn         = {2238-7854},
      address      = {Rio de Janeiro},
      publisher    = {Elsevier},
      reportid     = {FZJ-2025-02034},
      pages        = {561 - 569},
      year         = {2025},
      abstract     = {This study focuses on the comprehensive analysis of the
                      NaNO3-KNO3 system, a salt mixture that is extensively used
                      as a heat transfer fluid and thermal energy storage material
                      in concentrated solar power (CSP) plants. Despite its common
                      application, discrepancies exist in the reported equilibrium
                      phase diagrams, largely due to the formation of metastable
                      phases influenced by experimental conditions. This work
                      combines various thermophysical methods, including
                      differential scanning calorimetry, thermomechanical
                      analysis, laser flash analysis, and high-temperature X-ray
                      diffraction, to resolve these discrepancies. The thermal and
                      structural properties of a 50 mol $\%$ NaNO3 – 50 mol $\%$
                      KNO3 mixture have been determined. Significant differences
                      in phase transition temperatures and volume were observed
                      between the first and second heating cycles. In-situ HTXRD
                      confirmed the formation of metastable solid solution phases
                      upon cooling to room temperature after the first heating.
                      The comprehensive analysis provided insights into the
                      equilibrium and metastable states of the mixture,
                      highlighting the importance of combining thermal analysis
                      techniques with XRD for a thorough characterization of
                      material properties.},
      cin          = {IMD-1},
      ddc          = {670},
      cid          = {I:(DE-Juel1)IMD-1-20101013},
      pnm          = {1243 - Thermal Energy Storage (POF4-124) / BMWK 01GW0623 -
                      Verbundvorhaben: PCM-Screening-2 - Evaluierung von
                      Salzsystemen für den Einsatz als PCM: thermodynamische
                      Modellierung und experimentelle Methoden - 2; Teilvorhaben:
                      Thermochemie wasserfreier Salzsysteme für PCM (01GW0623)},
      pid          = {G:(DE-HGF)POF4-1243 / G:(BMWK)01GW0623},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:001452156600001},
      doi          = {10.1016/j.jmrt.2025.03.128},
      url          = {https://juser.fz-juelich.de/record/1040881},
}