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@ARTICLE{Mishra:837905,
      author       = {Mishra, S. K. and Mittal, R. and Chaplot, S. L. and
                      Ovsyannikov, S. V. and Trots, D. M. and Dubrovinsky, L. and
                      Su, Y. and Matsuishi, S. and Hosono, H. and Garbarino, G.
                      and Brückel, Thomas},
      title        = {{P}ressure-driven {P}hase {T}ransition in {C}a{F}e{A}s{F}
                      at 40 and 300 {K}},
      journal      = {Journal of physics / Conference Series},
      volume       = {377},
      issn         = {1742-6596},
      address      = {Bristol},
      publisher    = {IOP Publ.},
      reportid     = {FZJ-2017-06675},
      pages        = {012034 -},
      year         = {2012},
      abstract     = {We carried out systematic investigation of high pressure
                      crystal structure and structural phase transition upto 46
                      GPa at 40 K and 25 GPa at 300 K in CaFeAsF using powder
                      synchrotron x-ray diffraction experiments. Rietveld analysis
                      of the diffraction data at 40 K reveals a structural phase
                      transition from an orthorhombic to a monoclinic phase at Pc
                      = 13.7 GPa, while increasing pressure. The transition to a
                      lower symmetry phase (orthorhombic to monoclinic) in this
                      1111 compound under pressure is in contrast with the
                      transition to a high symmetry phase (orthorhombic to
                      tetragonal) as observed in the '122' type compounds. On
                      heating from 40 K at high pressure, CaFeAsF undergoes a
                      monoclinic to tetragonal phase transition around 25 GPa and
                      200 K. Further, it does not show any post-tetragonal phase
                      transition, as observed in '122' compounds (CaFe2As2,
                      BaFe2As2), and remains in the tetragonal phase upto 25 GPa
                      at 300 K. The dPc/dT slope is found to be positive for
                      CaFeAsF and CaFe2As2, unlike a negative gradient was found
                      in case of BaFe2As2.},
      cin          = {JCNS-2 / PGI-4 / JARA-FIT / JCNS-FRM-II},
      ddc          = {530},
      cid          = {I:(DE-Juel1)JCNS-2-20110106 / I:(DE-Juel1)PGI-4-20110106 /
                      $I:(DE-82)080009_20140620$ /
                      I:(DE-Juel1)JCNS-FRM-II-20110218},
      pnm          = {144 - Controlling Collective States (POF3-144) / 524 -
                      Controlling Collective States (POF3-524) / 6212 - Quantum
                      Condensed Matter: Magnetism, Superconductivity (POF3-621) /
                      6213 - Materials and Processes for Energy and Transport
                      Technologies (POF3-621) / 6G4 - Jülich Centre for Neutron
                      Research (JCNS) (POF3-623)},
      pid          = {G:(DE-HGF)POF3-144 / G:(DE-HGF)POF3-524 /
                      G:(DE-HGF)POF3-6212 / G:(DE-HGF)POF3-6213 /
                      G:(DE-HGF)POF3-6G4},
      experiment   = {EXP:(DE-MLZ)NOSPEC-20140101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000307728500034},
      doi          = {10.1088/1742-6596/377/1/012034},
      url          = {https://juser.fz-juelich.de/record/837905},
}