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@ARTICLE{Jamin:894439,
      author       = {Jamin, Christine and Dash, Apurv and Mishra, Nachiketa and
                      Bordia, Rajendra K. and Guillon, Olivier},
      title        = {{C}onstrained sintering of alumina micro-ring films on
                      stiff and compliant substrates: {C}onstriction or dilation?},
      journal      = {Acta materialia},
      volume       = {216},
      issn         = {1359-6454},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {FZJ-2021-03221},
      pages        = {117159 -},
      year         = {2021},
      abstract     = {The sintering behavior of ring-shaped alumina films on
                      different types of substrates (polished sapphire and
                      platinum coated sapphire) has been investigated. Variation
                      of substrate material, layer thickness and heating schedule
                      led to different interface properties which were quantified
                      using the interfacial friction parameter as a measure of the
                      slip distance of the free edge. This interfacial friction
                      implies the compliance of the film-substrate interface, thus
                      allowing the quantification of the ability of the free edges
                      to slide along the substrate. Ring structures were made with
                      outer radii of 100 –500 µm and the ratios of inner to
                      outer radii were 0.1 (broad ring segment with small inner
                      hole) and 0.4 (narrow ring segment with big inner hole).
                      During sintering, the outer film edge was found to recede in
                      all systems, whereas the behavior of the free edge located
                      at the inner hole was strongly dependent on the interfacial
                      friction. When sintering of alumina micro-rings were carried
                      out on sapphire substrate, a high interfacial friction
                      resulted in the positive displacement of the inner edge,
                      causing the inner hole to open. Sapphire substrates coated
                      with platinum offered a lower interfacial friction resulting
                      in the opening of the hole in a more distinct manner as
                      compared to the uncoated sapphire substrates. As the
                      thickness of the film also affects the interfacial friction,
                      a thicker film (27 µm) on platinum coated substrate had
                      very low friction. This resulted in a negative displacement
                      of the inner ring leading to closing of the hole. These
                      effects are in qualitative agreement with the predicted
                      analytical model for constrained sintering of annular
                      ceramic films. A combination of film thickness, substrate
                      material and aspect ratio of the ring either leading to
                      constriction or dilation of the annular alumina film were
                      carefully investigated.},
      cin          = {IEK-1},
      ddc          = {670},
      cid          = {I:(DE-Juel1)IEK-1-20101013},
      pnm          = {899 - ohne Topic (POF4-899) / DFG project 274005202 - SPP
                      1959: Manipulation of matter controlled by electric and
                      magnetic fields: Towards novel synthesis and processing
                      routes of inorganic materials (274005202) / DFG project
                      319339707 - Diffusionsgesteuerte Prozesse in
                      polykristallinem Ceroxid: Kombinierte Wirkung von
                      elektrischem Feld und mechanischer Belastung},
      pid          = {G:(DE-HGF)POF4-899 / G:(GEPRIS)274005202 /
                      G:(GEPRIS)319339707},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000687492500035},
      doi          = {10.1016/j.actamat.2021.117159},
      url          = {https://juser.fz-juelich.de/record/894439},
}