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@ARTICLE{Bakan:912468,
      author       = {Bakan, Emine and Sohn, Yoo Jung and Vaßen, Robert},
      title        = {{M}etastable to stable phase transformation in atmospheric
                      plasma sprayed {Y}b-silicate coating during post-heat
                      treatment},
      journal      = {Scripta materialia},
      volume       = {225},
      issn         = {1359-6462},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {FZJ-2022-05647},
      pages        = {115169 -},
      year         = {2023},
      abstract     = {Yb-silicate is used as volatilization barrier material in
                      environmental barrier coating applications. In this study,
                      metastable to stable phase transformation in highly
                      amorphous atmospheric plasma sprayed Yb-silicate coating was
                      investigated during post-heat treatment. High-temperature
                      X-ray diffraction (HT-XRD) was used to analyze the phase
                      composition of the coating at elevated temperatures. Three
                      metastable phases (Yb2Si2O7 (P-1), Yb2SiO5 (P21/c),
                      Yb4.67Si3O13 (P63/m)) and two stable phases (Yb2Si2O7
                      (C2/m), Yb2SiO5 (I2/a)) preferentially crystallized from the
                      amorphous coating starting at 1000 °C. Metastable phases
                      transformed into stable Yb2Si2O7 and Yb2SiO5 at higher
                      temperatures. HT-XRD data were used to estimate the volume
                      expansion in the coating due to the phase transformation and
                      the results were compared to the dilatometry measurements.
                      The estimated expansion from HT-XRD data was larger than the
                      measured expansion in dilatometry. Microstructural
                      investigation revealed crack healing in the coating during
                      the measurements which was associated with the lower
                      expansion measured in dilatometry},
      cin          = {IEK-1},
      ddc          = {670},
      cid          = {I:(DE-Juel1)IEK-1-20101013},
      pnm          = {1241 - Gas turbines (POF4-124)},
      pid          = {G:(DE-HGF)POF4-1241},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000902223100002},
      doi          = {10.1016/j.scriptamat.2022.115169},
      url          = {https://juser.fz-juelich.de/record/912468},
}