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@ARTICLE{Sohn:865634,
      author       = {Sohn, Yoo Jung and Mauer, Georg and Roth, Georg and
                      Guillon, Olivier and Vaßen, Robert},
      title        = {{C}rystal structure analysis and high‐temperature phase
                      transitions of complex rare‐earth perovskite, {L}a 2 ({A}l
                      1/2 {M}g{T}a 1/2 ){O} 6},
      journal      = {Journal of the American Ceramic Society},
      volume       = {103},
      number       = {2},
      issn         = {1551-2916},
      address      = {Westerville, Ohio},
      publisher    = {Soc.},
      reportid     = {FZJ-2019-04985},
      pages        = {1404-1413},
      year         = {2020},
      abstract     = {In situ high‐temperature powder X‐ray diffraction
                      analysis (HT‐XRD) was carried out in the temperature range
                      from 25°C‐1430°C to investigate the crystal structure of
                      double perovskites, La2(Al1/2MgTa1/2)O6 (LAMT) and its phase
                      transitions. This complex perovskite is a promising
                      candidate for application in thermal barrier coating
                      systems. Rietveld analysis shows a rock‐salt type ordering
                      of the B‐site cations in the monoclinic space group
                      symmetry, P21/n at room temperature. Upon heating, a
                      structural phase transition occurs at ~855°C, and the
                      crystal structure becomes rhombohedral with the space group
                      symmetry
                      urn:x-wiley:00027820:media:jace16740:jace16740-math-0001. On
                      further heating, LAMT transforms to the ideal cubic phase at
                      ~1390°C with the space group symmetry
                      urn:x-wiley:00027820:media:jace16740:jace16740-math-0002.
                      Both of the structural phase transitions are completely
                      reversible, and were confirmed through complementary
                      differential scanning calorimetry and thermogravimetry
                      measurements. With increasing temperature, the degree of the
                      octahedral tilting decreases and the variance of the
                      different B–O bond lengths is reduced, until in the cubic
                      phase, no tilting is present, and almost equal B–O bond
                      lengths are obtained.},
      cin          = {IEK-1 / JARA-ENERGY},
      ddc          = {660},
      cid          = {I:(DE-Juel1)IEK-1-20101013 / $I:(DE-82)080011_20140620$},
      pnm          = {113 - Methods and Concepts for Material Development
                      (POF3-113)},
      pid          = {G:(DE-HGF)POF3-113},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000486945300001},
      doi          = {10.1111/jace.16740},
      url          = {https://juser.fz-juelich.de/record/865634},
}