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@ARTICLE{Sazonov:859487,
      author       = {Sazonov, Andrew and Hutanu, Vladimir and Meven, Martin and
                      Roth, Georg and Georgii, Robert and Masuda, Takatsugu and
                      Náfrádi, Bálint},
      title        = {{C}rystal {S}tructure of {M}agnetoelectric
                      {B}a$_2${M}n{G}e$_2${O}$_7$ at {R}oom and {L}ow
                      {T}emperatures by {N}eutron {D}iffraction},
      journal      = {Inorganic chemistry},
      volume       = {57},
      number       = {9},
      issn         = {1520-510X},
      address      = {Washington, DC},
      publisher    = {American Chemical Society},
      reportid     = {FZJ-2019-00340},
      pages        = {5089 - 5095},
      year         = {2018},
      abstract     = {For a symmetry-consistent theoretical description of the
                      ferroelectric phase of Ba2MnGe2O7 melilite compound, a
                      precise knowledge of its crystal structure is a
                      prerequisite. Here we report results of single-crystal
                      neutron diffraction experiments on Ba2MnGe2O7 at room (300
                      K) and low (10 K) temperatures. The structural model based
                      on the tetragonal space group P4̅21m describes the
                      Ba2MnGe2O7 symmetry both at room and low temperatures. We
                      found reflections forbidden in the typical P4̅21m
                      melilite-type structure. A comparison of the experimental
                      data collected by means of both thermal and cold neutrons
                      with simulated multiple diffraction patterns allows us to
                      unambiguously demonstrate that forbidden peaks originate
                      from multiple diffraction (Renninger effect) rather than
                      from real symmetry lowering. The precise structural
                      parameters at 300 and 10 K are presented for the first time
                      and compared with those of other magnetoelectric
                      melilite-type germanates.},
      cin          = {JCNS-FRM-II / JCNS-2 / MLZ},
      ddc          = {540},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-2-20110106 / I:(DE-588b)4597118-3},
      pnm          = {6G4 - Jülich Centre for Neutron Research (JCNS) (POF3-623)
                      / 6G15 - FRM II / MLZ (POF3-6G15) / 524 - Controlling
                      Collective States (POF3-524) / 6212 - Quantum Condensed
                      Matter: Magnetism, Superconductivity (POF3-621)},
      pid          = {G:(DE-HGF)POF3-6G4 / G:(DE-HGF)POF3-6G15 /
                      G:(DE-HGF)POF3-524 / G:(DE-HGF)POF3-6212},
      experiment   = {EXP:(DE-MLZ)HEIDI-20140101 / EXP:(DE-MLZ)MIRA-20140101},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:29630373},
      UT           = {WOS:000431833500039},
      doi          = {10.1021/acs.inorgchem.8b00058},
      url          = {https://juser.fz-juelich.de/record/859487},
}