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@ARTICLE{Beirau:192654,
      author       = {Beirau, T. and Mihailova, B. and Malcherek, T. and
                      Paulmann, C. and Bismayer, U. and Groat, L. A.},
      title        = {{T}emperature-induced {P}21/c to {C}2/c phase transition in
                      partially amorphous ({METAMICT}) titanite revealed by
                      {R}aman spectroscopy},
      journal      = {The Canadian mineralogist},
      volume       = {52},
      number       = {1},
      issn         = {1499-1276},
      address      = {Ottawa},
      publisher    = {Assoc.},
      reportid     = {PUBDB-2014-04231, BMBF-Projekt 05K13GU1},
      pages        = {91 - 100},
      year         = {2014},
      note         = {(c) Mineralogical Association of Canada. Post referee
                      fulltext in progress.},
      abstract     = {In situ temperature-dependent Raman spectroscopic
                      measurements of two partially amorphous (metamict) titanite
                      samples with accumulated radiation doses ~1.2 × 1018
                      α-events/g (E2335) and ~2.2 ×1018 α-events/g (M28696) and
                      amorphous fractions of 0.24 and 0.5, respectively, provide
                      evidence for a thermally induced transformation analogous to
                      the phase transition P21/c ↔ C2/c, which is characteristic
                      of endmember titanite (CaTiSiO5). Quantitative analysis of
                      the temperature evolution of the wavenumbers and widths of
                      Raman-active vibrations in both partially amorphous
                      titanites reveals an anomaly near 500 K which is consistent
                      with the P21/c ↔ C2/c phase-transition temperature of
                      titanite close to its endmember composition. The observed
                      spectral changes are not due to structural recovery of the
                      radiation-damaged structure because synchrotron X-ray
                      diffraction experiments of M28696 titanite show that
                      relevant recrystallization occurs at annealing temperatures
                      above 600 K. The structural transformation near 500 K is
                      observed by Raman spectroscopy even in heavily
                      radiation-damaged and chemically inhomogeneous titanite
                      (M28696). The microstructure of the samples consists of
                      coexisting crystalline and amorphous domains, with the P21/c
                      to C2/c phase-transition occurring in the latter.},
      cin          = {DOOR},
      ddc          = {550},
      cid          = {I:(DE-H253)HAS-User-20120731},
      pnm          = {DORIS Beamline F1 (POF2-54G13)},
      pid          = {G:(DE-H253)POF2-F1-20130405},
      experiment   = {EXP:(DE-H253)D-F1-20150101},
      typ          = {PUB:(DE-HGF)29 / PUB:(DE-HGF)16},
      UT           = {WOS:000336185600007},
      doi          = {10.3749/canmin.52.1.91},
      url          = {https://bib-pubdb1.desy.de/record/192654},
}