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@ARTICLE{Mishra:907172,
      author       = {Mishra, Tarini Prasad and Wang, Shufan and Lenser,
                      Christian and Jennings, Dylan and Kindelmann, Moritz and
                      Rheinheimer, Wolfgang and Broeckmann, Christoph and Bram,
                      Martin and Guillon, Olivier},
      title        = {{U}ltra-fast high-temperature sintering of strontium
                      titanate},
      journal      = {Acta materialia},
      volume       = {231},
      issn         = {1359-6454},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {FZJ-2022-01877},
      pages        = {117918 -},
      year         = {2022},
      abstract     = {Ultrafast High-temperature Sintering (UHS) is a novel
                      sintering process enabling extremely high heating rates by
                      direct contact of sample to electrically heated thin carbon
                      strips. Using strontium titanate as a model system, the
                      densification behavior by UHS was investigated. Controlled
                      experiments via maximum current limitation were used to
                      study the influence of the applied current on the degree of
                      densification and resulting final grain size. Simulations by
                      Finite Element Modeling (FEM) allow estimating the sample
                      temperature reached during UHS, which is in good agreement
                      with the experimental data. Moreover, the FEM simulations
                      show a self-stabilization of the sample temperature by
                      thermal radiation. UHS results suggest that rapid
                      densification can be achieved with an extremely high heating
                      rate. The microstructure of the undoped strontium titanate
                      samples shows exaggerated grain growth and pore-boundary
                      separation, which results in pore entrapment inside grains.
                      The addition of 2 $mol\%$ iron in strontium titanate is
                      beneficial by limiting the grain growth during the UHS
                      sintering cycle. Uniform densification and grain growth in
                      the sample is consequently observed. Scanning transmission
                      electron microscopy/energy dispersive x-ray spectroscopy
                      (STEM/EDS) is utilized to analyze grain boundary
                      segregation. Measurement of the electrical conductivity of
                      the UHS sintered samples by impedance spectroscopy suggest
                      that rapid densification by UHS enables full access to the
                      functional properties of strontium titanate as compared to
                      the conventionally sintered material.},
      cin          = {IEK-1},
      ddc          = {670},
      cid          = {I:(DE-Juel1)IEK-1-20101013},
      pnm          = {899 - ohne Topic (POF4-899) / SPP 1959:  Manipulation of
                      matter controlled by electric and magnetic fields: Towards
                      novel synthesis and processing routes of inorganic materials
                      (274005202)},
      pid          = {G:(DE-HGF)POF4-899 / G:(GEPRIS)274005202},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000806671600003},
      doi          = {10.1016/j.actamat.2022.117918},
      url          = {https://juser.fz-juelich.de/record/907172},
}