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@ARTICLE{Bessas:172683,
      author       = {Bessas, D. and Simon, R. E. and Friese, K. and Koza, M. and
                      Hermann, R. P.},
      title        = {{L}attice dynamics in intermetallic {M}g 2 {G}e and {M}g 2
                      {S}i424},
      journal      = {Journal of physics / Condensed matter},
      volume       = {26},
      number       = {48},
      issn         = {1361-648X},
      address      = {Bristol},
      publisher    = {IOP Publ.},
      reportid     = {FZJ-2014-06135},
      pages        = {485401 -},
      year         = {2014},
      abstract     = {The lattice dynamics of polycrystalline Mg2Ge and Mg2Si are
                      compared using both microscopic and macroscopic measurements
                      as well as theoretical calculations. The volume thermal
                      expansion coefficient between 200 and 300 K was found to be
                      4.37(5) centerdot 10−5 K−1 in Mg2Ge, compared to 3.69(5)
                      centerdot 10−5 K−1 in Mg2Si. Inelastic neutron
                      scattering measurements yield densities of phonon states
                      which are in line with theoretical calculations. The
                      microscopic data were corroborated with macroscopic
                      calorimetry measurements and provide quantified values for
                      anharmonicity. The estimated macroscopic Grüneisen
                      parameter is, γMg2Si = 1.17(5) and γMg2Ge = 1.46(5) at 295
                      K, in excellent agreement with Raman scattering data.
                      Although the element specific mean force constants are
                      practically the same, in Mg2Ge and Mg2Si, a mass homology
                      relation alone cannot reproduce the difference in the
                      partial densities of vibrational states in these compounds
                      and differences in elemental bonding should be taken into
                      account.},
      cin          = {JCNS-2 / PGI-4 / JARA-FIT},
      ddc          = {530},
      cid          = {I:(DE-Juel1)JCNS-2-20110106 / I:(DE-Juel1)PGI-4-20110106 /
                      $I:(DE-82)080009_20140620$},
      pnm          = {422 - Spin-based and quantum information (POF2-422) / 424 -
                      Exploratory materials and phenomena (POF2-424) / 542 -
                      Neutrons (POF2-542) / 544 - In-house Research with PNI
                      (POF2-544) / 54G - JCNS (POF2-54G24)},
      pid          = {G:(DE-HGF)POF2-422 / G:(DE-HGF)POF2-424 /
                      G:(DE-HGF)POF2-542 / G:(DE-HGF)POF2-544 /
                      G:(DE-HGF)POF2-54G24},
      experiment   = {EXP:(DE-MLZ)External-20140101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000345221700019},
      doi          = {10.1088/0953-8984/26/48/485401},
      url          = {https://juser.fz-juelich.de/record/172683},
}