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@ARTICLE{Wen:186620,
      author       = {Wen, Qingbo and Xu, Yeping and Xu, Binbin and Fasel,
                      Claudia and Guillon, Olivier and Buntkowsky, Gerd and Yu,
                      Zhaoju and Riedel, Ralf and Ionescu, Emanuel},
      title        = {{S}ingle-source-precursor synthesis of dense
                      {S}i{C}/{H}f{C}$_{x}${N}$_{1-x}$-based ultrahigh-temperature
                      ceramic nanocomposites},
      journal      = {Nanoscale},
      volume       = {6},
      number       = {22},
      issn         = {2040-3372},
      address      = {Cambridge},
      publisher    = {RSC Publ.},
      reportid     = {FZJ-2015-00693},
      pages        = {13678 - 13689},
      year         = {2014},
      abstract     = {A novel single-source precursor was synthesized by the
                      reaction of an allyl hydrido polycarbosilane (SMP10) and
                      tetrakis(dimethylamido)hafnium(IV) (TDMAH) for the purpose
                      of preparing dense monolithic SiC/HfCxN1−x-based ultrahigh
                      temperature ceramic nanocomposites. The materials obtained
                      at different stages of the synthesis process were
                      characterized via Fourier transform infrared (FT-IR) as well
                      as nuclear magnetic resonance (NMR) spectroscopy. The
                      polymer-to-ceramic transformation was investigated by means
                      of MAS NMR and FT-IR spectroscopy as well as
                      thermogravimetric analysis (TGA) coupled with in situ mass
                      spectrometry. Moreover, the microstructural evolution of the
                      synthesized SiHfCN-based ceramics annealed at different
                      temperatures ranging from 1300 °C to 1800 °C was
                      characterized by elemental analysis, X-ray diffraction,
                      Raman spectroscopy and transmission electron microscopy
                      (TEM). Based on its high temperature behavior, the amorphous
                      SiHfCN-based ceramic powder was used to prepare monolithic
                      SiC/HfCxN1−x-based nanocomposites using the spark plasma
                      sintering (SPS) technique. The results showed that dense
                      monolithic SiC/HfCxN1−x-based nanocomposites with low open
                      porosity (0.74 $vol\%)$ can be prepared successfully from
                      single-source precursors. The average grain size of both
                      HfC0.83N0.17 and SiC phases was found to be less than 100 nm
                      after SPS processing owing to a unique microstructure:
                      HfC0.83N0.17 grains were embedded homogeneously in a β-SiC
                      matrix and encapsulated by in situ formed carbon layers
                      which acted as a diffusion barrier to suppress grain growth.
                      The segregated Hf-carbonitride grains significantly
                      influenced the electrical conductivity of the SPS processed
                      monolithic samples. While Hf-free polymer-derived SiC showed
                      an electrical conductivity of ca. 1.8 S cm−1, the
                      electrical conductivity of the Hf-containing material was
                      analyzed to be ca. 136.2 S cm−1.},
      cin          = {IEK-1},
      ddc          = {600},
      cid          = {I:(DE-Juel1)IEK-1-20101013},
      pnm          = {899 - ohne Topic (POF2-899)},
      pid          = {G:(DE-HGF)POF2-899},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000344836800049},
      doi          = {10.1039/C4NR03376K},
      url          = {https://juser.fz-juelich.de/record/186620},
}