Effect of processing on the structural characteristics of sintered silicon oxycarbide materials

Mazo, M. Alejandra; Tamayo, Aitana; Rubio, F.; Soriano, David S.; Rubio, J.

doi:10.1016/j.jnoncrysol.2014.03.006

Cited by 18 publications

(14 citation statements)

References 46 publications

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“…In Fig. (d), the spectrum of the sample obtained in H 2 at 800°C exhibit an apparent shoulder at 880 cm −1 , which can be assigned to inorganic Si–C bonds incorporated into the Si–O–C network . The spectra of the sample obtained in Ar and CO 2 at 800°C, however, do not exhibits the shoulder at 880 cm −1 .…”

Section: Resultsmentioning

confidence: 99%

Effects of Atmospheric Composition on the Molecular Structure of Synthesized Silicon Oxycarbides

et al. 2015

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The dependence of silicon oxycarbides' chemical composition and molecular structure on their reaction conditions was tested by varying the atmosphere under which pyrolysis was performed. To obtain the silicon oxycarbides, densely cross‐linked silicone resin particles with an averaged diameter of 2 μm were pyrolyzed in various atmospheres of H2, Ar, and CO2, in the temperature range 700°C–1100°C. The residual mass of resin after pyrolysis was almost constant at 700°C, although their apparent colors varied distinctly. The sample obtained from the H2 atmosphere was white, whereas that obtained from the CO2 atmosphere was dark brown. Fourier‐transform infrared (FT‐IR) spectra of the residues suggested that the Si–O–Si network evolution was accelerated in the CO2 atmosphere. Beyond 800°C, the chemical compositions of the compounds obtained from a H2 atmosphere increasingly approached near‐stoichiometric SiO2–xSiC composition with increasing the pyrolysis temperature. Compounds from a CO2 atmosphere approached a composition of SiO2–xC with no free SiC as the pyrolysis temperature increased. In the products from an Ar atmosphere, SiO2–xSiC–yC compositions were typically obtained. The observed effects of the pyrolysis atmosphere on the resulting chemical compositions were analyzed in terms of thermodynamic calculations. Electron spin resonance (ESR) spectra revealed broad and intense signals from products obtained from either Ar or CO2. Estimating from the signal intensity, the residual spin concentrations were in the range 1018–1019 g−1. Meanwhile, the spectra from the samples obtained in H2 showed weak and sharp signals with estimated spin concentrations ranging from 1016–1017 g−1. This signal attenuation may have been due to the hydrogen capping of dangling bond formed during pyrolysis.

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Section: Resultsmentioning

confidence: 99%

Effects of Atmospheric Composition on the Molecular Structure of Synthesized Silicon Oxycarbides

et al. 2015

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“…At this temperature, the materials exhibited broad bands centered at~1050 and 800 cm À1 and a low intensity band at~460 cm À1 . The first band corresponds to n ass SieOeSi [30], the second one is related to n s SieOeSi [30] and nSieC [10], and the last one is associated to dSieO [31]. The ceramic materials exhibited the same absorption bands, however with different intensities.…”

Section: Investigation Of Polymeric Precursor-ceramic Materials Convermentioning

confidence: 94%

“…Moreover, the pyrolysis temperature (1000 C) is lower than the temperature that favors the carbothermal reduction reaction (normally ! 1200 C) [10].…”

Section: Structural and Chemical Composition Characterization Of The mentioning

confidence: 99%

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Influence of activated charcoal on the structural and morphological characteristics of ceramic based on silicon oxycarbide (SiOC): A promising approach to obtain a new electrochemical sensing platform

Godoy

Pereira

Duarte

et al. 2016

Materials Chemistry and Physics

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“…From all these local analyses we can conclude that these NP are composed of SiC and covered by a layer of silicon oxide. Nevertheless, the presence of a complex Si-O-C compound [35] can not be ruled out at least at the surface of the NP. It is worth mentioning that all these results confirm those observed on these samples by macroscopic spectroscopic measurements, as discussed below (vide infra).…”

Section: Synthesis Of Sic Nanoparticles By Laser Ablation In Aqueous mentioning

confidence: 99%

Continuous-Mode Laser Ablation at the Solid–Liquid Interface of Pelletized Low-Cost Materials for the Production of Luminescent Silicon Carbide Nanocrystals

et al. 2015

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We report on the fabrication of silicon carbide (SiC) nanocrystals using a continuous scanning mode laser for the ablation of pelletized SiC microparticles (NPs). As a major advantage, we propose the in-situ generation and collection of freestanding nanoparticles in an ethanol liquid media and the use of cost-effective SiC targets in comparison with those commercially available or synthesized after multiple-steps. The SiC NPs exhibit luminescent properties under UV exposure and excellent colloidal stability for extended periods of time. The influence of a more oxidizing solvent such as water is also evaluated as collecting media.

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Effect of processing on the structural characteristics of sintered silicon oxycarbide materials

Cited by 18 publications

References 46 publications

Effects of Atmospheric Composition on the Molecular Structure of Synthesized Silicon Oxycarbides

Effects of Atmospheric Composition on the Molecular Structure of Synthesized Silicon Oxycarbides

Influence of activated charcoal on the structural and morphological characteristics of ceramic based on silicon oxycarbide (SiOC): A promising approach to obtain a new electrochemical sensing platform

Continuous-Mode Laser Ablation at the Solid–Liquid Interface of Pelletized Low-Cost Materials for the Production of Luminescent Silicon Carbide Nanocrystals

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