Phase separation of a hafnium alkoxide-modified polysilazane upon polymer-to-ceramic transformation—A case study

Ionescu, Emanuel; Papendorf, Benjamin; Kleebe, Hans‐Joachim; Breitzke, Hergen; Nonnenmacher, Katharina; Buntkowsky, Gerd; Riedel, Ralf

doi:10.1016/j.jeurceramsoc.2011.09.003

Cited by 57 publications

(67 citation statements)

References 33 publications

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“…This effect was also reported in SiHfCNO and SiHfOC materials prepared from hafnium-alkoxide-modified polysilazanes and polysiloxanes, respectively. 33 The third signal in the NMR spectrum of the PHPS derived silicon nitride (chemical shift at −51.9 ppm) was assigned to SiN 3 H and it indicates that some hydrogen is retained in the as-prepared sample. The 29 Si spectrum of SiHfN-3 annealed at 1300 • C is shown in Fig.…”

Section: Specimensmentioning

confidence: 99%

Synthesis and high-temperature evolution of single-phase amorphous Si–Hf–N ceramics

Zhou

Gao

et al. 2015

Journal of the European Ceramic Society

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Section: Specimensmentioning

confidence: 99%

Synthesis and high-temperature evolution of single-phase amorphous Si–Hf–N ceramics

Zhou

Gao

et al. 2015

Journal of the European Ceramic Society

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“…Metal‐modified silicon oxycarbonitrides were also synthesized; however, not only MO x /SiCNO nanocomposites (M = Ti, Zr, and Hf) but also M/SiCNO (for Cu, Ni) and MSi x /SiCNO (Fe, Co, Pd) were reported. In the case of MO x /SiCNO, a similar polymer‐to‐ceramic transformation as for MO x /SiOC was proposed (i.e., formation of a single‐phase amorphous SiMCNO at low temperatures and subsequent phase separation of MO x ) . However, the phase separation of metals or metal silicides as found in M/SiCN(O) and MSi x /SiCN(O) compositions has not been clarified so far.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Control of Phase Composition and Crystallization of Metal‐Modified Silicon Oxycarbides

et al. 2013

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Silicon oxycarbides modified with main group or transition metals (SiMOC) are usually synthesized via pyrolysis of sol-gel precursors from suitable metal-modified orthosilicates or polysiloxanes. In this study, the phase composition of different SiMOC systems (M = Sn, Fe, Mn, V, and Lu) was investigated. Depending on the metal, different ceramic phases formed. For M = Mn and Lu, MO x /SiOC ceramic nanocomposites were formed, whereas other compositions revealed the formation of M/SiOC (M = Sn), MSi x /SiOC (M = Fe) or MC x /SiOC (M = V) upon pyrolysis. The different phase compositions of the SiMOC materials are rationalized by a simple thermodynamic approach which generally correctly predicts which type of ceramic nanocomposite is expected upon ceramization of the metal-modified precursors. Calculations show that the thermodynamic stability of the MO x phase with respect to that of the C-O system is the most important factor to predict phase formation in polymer-derived SiMOC ceramic systems. A secondary factor is the relative stability of metal oxides, silicates, carbides, and silicides.

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“…Polysilazanes can be chemically modified by reactions with transition metal alkoxides, as it has been shown for Al or group IV metal alkoxides (M = Ti, Zr, Hf). In different studies, hydrido- [ 72 , 73 ] or methyl-/vinyl-substituted polysilazanes [ 6 , 62 , 74 , 75 ] were reacted with group IV metal alkoxides. In the case of hydrido-polysilazane, the reaction with titanium n -butoxide takes place at the N–H groups upon formation of Si–Ti linkages.…”

Section: Preceramic Polymersmentioning

confidence: 99%

Ceramic Nanocomposites from Tailor-Made Preceramic Polymers

et al. 2015

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The present Review addresses current developments related to polymer-derived ceramic nanocomposites (PDC-NCs). Different classes of preceramic polymers are briefly introduced and their conversion into ceramic materials with adjustable phase compositions and microstructures is presented. Emphasis is set on discussing the intimate relationship between the chemistry and structural architecture of the precursor and the structural features and properties of the resulting ceramic nanocomposites. Various structural and functional properties of silicon-containing ceramic nanocomposites as well as different preparative strategies to achieve nano-scaled PDC-NC-based ordered structures are highlighted, based on selected ceramic nanocomposite systems. Furthermore, prospective applications of the PDC-NCs such as high-temperature stable materials for thermal protection systems, membranes for hot gas separation purposes, materials for heterogeneous catalysis, nano-confinement materials for hydrogen storage applications as well as anode materials for secondary ion batteries are introduced and discussed in detail.

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Phase separation of a hafnium alkoxide-modified polysilazane upon polymer-to-ceramic transformation—A case study

Cited by 57 publications

References 33 publications

Synthesis and high-temperature evolution of single-phase amorphous Si–Hf–N ceramics

Synthesis and high-temperature evolution of single-phase amorphous Si–Hf–N ceramics

Thermodynamic Control of Phase Composition and Crystallization of Metal‐Modified Silicon Oxycarbides

Ceramic Nanocomposites from Tailor-Made Preceramic Polymers

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