Processing and thermal properties of an Mo5Si3C–SiC ceramic

Buchheit, Andrew A.; Hilmas, Greg; Fahrenholtz, William G.; Deason, D.; Wang, Hsin

doi:10.1016/j.intermet.2008.03.010

Cited by 7 publications

(2 citation statements)

References 17 publications

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“…Electrochemical measurements revealed that the in situ-generated NP exhibits an outstanding catalytic activity with respect to the HER. To the best of our knowledge, 27,28 this is the first time that the NP is discovered to possess electrocatalytic activity and excellent durability in terms of the HER. The obtained NP/C/SiC nanocomposite is characterized by the following specific features: (a) in situ-formed catalytically active NP nanoparticles within an in situ-generated SiC/C-based matrix and (b) the simultaneous formation of carbon-rich phases improving the electric conductivity, which significantly increases the charge transfer rate during the HER process.…”

mentioning

confidence: 94%

Nowotny phase Mo₃₊₂_xSi₃C_0.6 dispersed in a porous SiC/C matrix: A novel catalyst for hydrogen evolution reaction

Feng

Schuch

et al. 2019

J Am Ceram Soc

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The ternary Nowotny phase (NP), with a composition Mo3+2xSi3C0.6 (x = 0.9‐0.764), is found to be catalytically active in the field of electrochemical water splitting. The NP embedded in a porous SiC/C nanocomposite matrix is synthesized via a single‐source‐precursor approach which involves the reaction of allylhydridopolycarbosilane with MoO2(acac)2. Thermal treatment of the single‐source‐precursor up to 1400°C in a protective atmosphere results in the in situ formation of nanocrystalline Mo3+2xSi3C0.6 immobilized in a thermally and corrosion‐stable SiC/C matrix. The weight fractions of the observed crystalline phases Mo3+2xSi3C0.6 and SiC amount to ca. 28 (26) and 72 (74) wt%, respectively, when prepared at 1400°C (1350°C). The porosity of the formed nanocomposite is adjusted by the addition of polystyrene (PS) as a pore former to the single‐source‐precursor resulting in a specific surface area up to 206 m2/g. The electrocatalytic activity of the Mo3+2xSi3C0.6/C/SiC nanocomposite with respect to the hydrogen evolution reaction (HER) is characterized by low over potentials of 22 and 138 mV vs reversible hydrogen electrode (RHE) for applying 1 and 10 mA cm−2 of current density, respectively. The analyzed electrocatalytic performance exceeds that of most Mo‐based electrocatalysts and shows high stability (over 90%) during 35 hours.

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confidence: 94%

Nowotny phase Mo₃₊₂_xSi₃C_0.6 dispersed in a porous SiC/C matrix: A novel catalyst for hydrogen evolution reaction

Feng

Schuch

et al. 2019

J Am Ceram Soc

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“…identified and characterized the Nowotny phase (NP) with the composition of Mo 4.8 Si 3 C 0.6 , which is the only stable ternary phase in the Mo–Si–C system, . Within the past decades, the Mo 4.8 Si 3 C 0.6 as an attractive second-phase in SiC-based ceramics has been widely studied for application at high temperatures, due to its excellent mechanical properties and high melting point (∼2100 °C) superior than that of the MoSi 2 and Mo 5 Si 3 phases. , Accordingly, the Mo 4.8 Si 3 C 0.6 /SiC-based composites revealed enhanced fracture toughness and creep resistance at both room- and high-temperatures − as well as outstanding oxidation resistance up to 1600 °C . Furthermore, the Mo 4.8 Si 3 C 0.6 phase is found to exhibit high electrical conductivity, and its superconducting transition temperature is reported to be as high as 12.2 K .…”

Section: Introductionmentioning

confidence: 99%

Dielectric Properties and Electromagnetic Wave Absorbing Performance of Single-Source-Precursor Synthesized Mo_4.8Si₃C_0.6/SiC/C_free Nanocomposites with an In Situ Formed Nowotny Phase

Feng

Yang

Wen

et al. 2020

ACS Appl. Mater. Interfaces

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For the first time, dielectric properties and electromagnetic wave (EMW) absorbing performance of single-source-precursor derived Mo 4.8 Si 3 C 0.6 /SiC/C free ceramic nanocomposites with a highly electrically conductive intermetallic Nowotny phase (NP, i.e., Mo 4.8 Si 3 C 0.6 ) are reported. High-temperature phase evolution of the nanocomposites reveals that free carbon (C free ) plays a crucial role in the in situ formation of the NP, indicating that the microstructure of the nanocomposites can be tailored via molecular design of the single-source precursors. Compared with SiC/C free and MoSi 2 / SiC/C free nanocomposites obtained under the same conditions, the Mo 4.8 Si 3 C 0.6 /SiC/C free nanocomposites exhibit significantly enhanced EMW absorbing performance. A minimum reflection loss (RL) of −59 dB was achieved at 8 GHz for the thickness of 2.46 mm, proving the superiority of the Mo 4.8 Si 3 C 0.6 /SiC/C free nanocomposite as an outstanding EMW absorbing material. On the basis of our previous discovery that the Mo 4.8 Si 3 C 0.6 embedded in a SiC-based matrix with high specific surface area exhibits excellent electrocatalytic properties suitable for the electrochemical hydrogen evolution reaction, the present results prove that Mo 4.8 Si 3 C 0.6 /SiC/C free nanocomposites have to be considered as novel multifunctional materials with tailorable microstructure and excellent performance in two different fields including electrochemical water splitting and EMW absorption.

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Synthesis of ceramics by sol–gel method in molybdenum, silicon and carbon containing systems. Thermogravimetric studies

Biedunkiewicz

Krawczyk

Gabriel-Półrolniczak

et al. 2014

Advanced Powder Technology

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Processing and thermal properties of an Mo5Si3C–SiC ceramic

Cited by 7 publications

References 17 publications

Nowotny phase Mo₃₊₂_xSi₃C_0.6 dispersed in a porous SiC/C matrix: A novel catalyst for hydrogen evolution reaction

Nowotny phase Mo₃₊₂_xSi₃C_0.6 dispersed in a porous SiC/C matrix: A novel catalyst for hydrogen evolution reaction

Dielectric Properties and Electromagnetic Wave Absorbing Performance of Single-Source-Precursor Synthesized Mo_4.8Si₃C_0.6/SiC/C_free Nanocomposites with an In Situ Formed Nowotny Phase

Synthesis of ceramics by sol–gel method in molybdenum, silicon and carbon containing systems. Thermogravimetric studies

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Processing and thermal properties of an Mo5Si3C–SiC ceramic

Cited by 7 publications

References 17 publications

Nowotny phase Mo3+2xSi3C0.6 dispersed in a porous SiC/C matrix: A novel catalyst for hydrogen evolution reaction

Nowotny phase Mo3+2xSi3C0.6 dispersed in a porous SiC/C matrix: A novel catalyst for hydrogen evolution reaction

Dielectric Properties and Electromagnetic Wave Absorbing Performance of Single-Source-Precursor Synthesized Mo4.8Si3C0.6/SiC/Cfree Nanocomposites with an In Situ Formed Nowotny Phase

Synthesis of ceramics by sol–gel method in molybdenum, silicon and carbon containing systems. Thermogravimetric studies

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Nowotny phase Mo₃₊₂_xSi₃C_0.6 dispersed in a porous SiC/C matrix: A novel catalyst for hydrogen evolution reaction

Nowotny phase Mo₃₊₂_xSi₃C_0.6 dispersed in a porous SiC/C matrix: A novel catalyst for hydrogen evolution reaction

Dielectric Properties and Electromagnetic Wave Absorbing Performance of Single-Source-Precursor Synthesized Mo_4.8Si₃C_0.6/SiC/C_free Nanocomposites with an In Situ Formed Nowotny Phase