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@ARTICLE{Schlup:887815,
      author       = {Schlup, Andrew P. and Costakis, William J. and Rheinheimer,
                      Wolfgang and Trice, Rodney W. and Youngblood, Jeffrey P.},
      title        = {{H}ot‐pressing platelet alumina to transparency},
      journal      = {Journal of the American Ceramic Society},
      volume       = {103},
      number       = {4},
      issn         = {1551-2916},
      address      = {Westerville, Ohio},
      publisher    = {Soc.},
      reportid     = {FZJ-2020-04441},
      pages        = {2587 - 2601},
      year         = {2020},
      abstract     = {Alumina powder with a platelet morphology was hot‐pressed
                      to transparency with preload pressures of 0‐8 MPa, maximum
                      temperatures of 1750‐1825°C, maximum pressures of
                      2.5‐80 MPa, and isothermal hold times of 1‐7 hours.
                      Optical transmission (in‐line and total), as well as
                      optical losses (backward/forward scattering and absorption),
                      of the hot‐pressed samples were measured and related to
                      the microstructure. Higher hot‐pressing temperatures
                      increase the in‐line transmission. A gray discoloration of
                      the samples (indicative of high absorption) was minimized by
                      heat treating the powder in air prior to hot pressing and
                      reducing the preload pressure. Maximum pressures above/below
                      10 MPa increased porosity, which decreased in‐line
                      transmission and increased backward/forward scattering.
                      Lower densities at higher pressures are attributed to a
                      pore‐swelling phenomenon. Increasing isothermal hold time
                      decreased porosity, which increased in‐line transmission
                      and reduced backward/forward scattering. Best optical
                      properties with an in‐line transmission of $65.3\%$ at 645
                      nm (0.8 mm thick) were achieved by hot‐pressing
                      heat‐treated platelet alumina powder with a preload
                      pressure of 0 MPa, maximum temperature of 1800°C, maximum
                      pressure of 10 MPa, and an isothermal hold time of 7 hours.
                      This high in‐line transmission, despite its large grain
                      size (65 µm), is attributed to crystallographic orientation
                      of the platelets during hot pressing.},
      cin          = {IEK-1},
      ddc          = {660},
      cid          = {I:(DE-Juel1)IEK-1-20101013},
      pnm          = {899 - ohne Topic (POF3-899)},
      pid          = {G:(DE-HGF)POF3-899},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000503637600001},
      doi          = {10.1111/jace.16932},
      url          = {https://juser.fz-juelich.de/record/887815},
}