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@ARTICLE{Simonenko:825199,
      author       = {Simonenko, E. P. and Simonenko, N. P. and Kopitsa, G. P.
                      and Pipich, Vitaliy and Sevastyanov, V. G. and Kuznetsov, N.
                      T.},
      title        = {{H}ow xerogel carbonization conditions affect the
                      reactivity of highly disperse {S}i{O}2–{C} composites in
                      the sol–gel synthesis of nanocrystalline silicon carbide},
      journal      = {Russian journal of inorganic chemistry},
      volume       = {61},
      number       = {11},
      issn         = {1531-8613},
      address      = {Moscow},
      publisher    = {MAIK Nauka/Interperiodica Publ.},
      reportid     = {FZJ-2016-07670},
      pages        = {1347 - 1360},
      year         = {2016},
      abstract     = {A transparent silicon polymer gel was prepared by sol–gel
                      technology to serve as the base in the preparation of highly
                      disperse SiO2–C composites at various temperatures (400,
                      600, 800, and 1000°C) and various exposure times (1, 3, and
                      6 h) via pyrolysis under a dynamic vacuum (at residual
                      pressures of ~1 × 10–1 to 1 × 10–2 mmHg). These
                      composites were X-ray amorphous; their thermal behavior in
                      flowing air in the range 20–1200°C was studied. The
                      encapsulation of nascent carbon, which kept it from
                      oxidizing in air and reduced the reactivity of the system in
                      SiC synthesis, was enhanced as the carbonization temperature
                      and exposure time increased. How xerogel carbonization
                      conditions affect the micro- and mesostructure of the
                      xerogel was studied by ultra-small-angle neutron scattering
                      (USANS). Both the carbonization temperature and the exposure
                      time were found to considerably influence structure
                      formation in highly disperse SiO2–C composites. Dynamic
                      DSC/DTA/TG experiments in an inert gas flow showed that the
                      increasing xerogel pyrolysis temperatures significantly
                      reduced silicon carbide yields upon subsequent heating of
                      SiO2–C sys- tems to 1500°C, from 35–39 (400°C) to
                      $10–21\%$ (1000°C).},
      cin          = {JCNS (München) ; Jülich Centre for Neutron Science JCNS
                      (München) ; JCNS-FRM-II / Neutronenstreuung ; JCNS-1},
      ddc          = {540},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-1-20110106},
      pnm          = {6G4 - Jülich Centre for Neutron Research (JCNS) (POF3-623)
                      / 6G15 - FRM II / MLZ (POF3-6G15)},
      pid          = {G:(DE-HGF)POF3-6G4 / G:(DE-HGF)POF3-6G15},
      experiment   = {EXP:(DE-MLZ)KWS3-20140101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000388704300002},
      doi          = {10.1134/S0036023616110206},
      url          = {https://juser.fz-juelich.de/record/825199},
}