High-temperature corrosion of metals in the salt and metallic melts containing rare earths

Karpov, V. V.; Abramov, A. V.; Zhilyakov, A. Yu.; Беликов, С.; Volkovich, Vladimir A.; Polovov, Ilya B.; Rebrin, O. I.

doi:10.1063/1.4962595

AIP Conference Proceedings

2016

DOI: 10.1063/1.4962595

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High-temperature corrosion of metals in the salt and metallic melts containing rare earths

V. V. Karpov¹,

A. V. Abramov²,

A. Yu. Zhilyakov³

et al.

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Cited by 4 publications

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“…30 By our CVD approach (i.e., using a Mo foil and a glass substrate), small amounts of Na are released from the glass and interact with the Mo foil, inducing corrosion: This, in turn, would increase the reactivity and volatilization of Mo atoms. [45][46][47] The Mo foil precursor, in lieu of the Mo oxide powder, thus, assures a uniform Mo supply, fostering a large-scale growth as previously observed for MoS 2 . 35,48 Overall, in contrast with common two-powder precursor approaches, our growth method offers a much higher control on the 2D crystal formation, which ends up in atomic-thick, polygonal (e.g., triangular and hexagonal) crystals.…”

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confidence: 74%

Strain-modulated optical response in 2D MoSe2 made by Na-assisted CVD on glass

Rodrigues

Grzonka

Fernandes

et al. 2022

Applied Physics Letters

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Extended investigations on 2D transition metal dichalcogenides (TMDCs) have opened sound possibilities to apply these materials in several technological fields such as sensing. To this end, fully reproducible methods for the wafer-scale production of crystalline and uniform 2D TMDCs are in demand. In this work, atomically thin MoSe2 was grown by atmospheric-pressure chemical vapor deposition using the Na-assisted process with Se powder and Mo foil precursors on a glass substrate. The samples were extensively characterized via Raman and photoluminescence spectroscopy, atomic force microscopy, transmission electron microscopy, and x-ray photoelectron spectroscopy. The MoSe2 samples consist of submillimeter, monolayer single-crystals with 2H phase configuration. Being monolayer and crystalline, the samples exhibit well-defined and intense photoluminescence. CVD-grown 2D MoSe2 was integrated into a device with strain-tunable optical properties and tested. Under tensile strain (in the range of 0.2%–0.4%), the spectral emission responded to an in-plane strain with marked peak shifts toward lower energies for increasing levels of strain (∼3 and ∼2 nm shift for the main PL component at 0.2% and 0.4%, respectively), indicating a reduction of the bandgap.

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mentioning

confidence: 74%

Strain-modulated optical response in 2D MoSe2 made by Na-assisted CVD on glass

Rodrigues

Grzonka

Fernandes

et al. 2022

Applied Physics Letters

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Investigation on the Corrosion Behavior of Nickel‐Base Alloys in Molten Chlorides for Sensible Heat Energy Applications

et al. 2020

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Nine selected alloys are exposed in molten KCl–LiCl (eutectic composition) at 1073 K for 167 h under argon atmosphere to predict the long‐term corrosion behavior of these structural materials. The corrosive attack of each alloy is assessed with gravimetric methods, scanning electron microscopy, and energy‐dispersive X‐ray spectroscopy measurements. The corrosion rate of each alloy is calculated in accordance with ASTM G1‐03. Low chromium containing alloys as HAYNES 242, Hastelloy B‐3, and Hastelloy N revealed minor or no significant corrosive attack after molten chloride exposure. Alloy 600, Alloy 617, HAYNES 625, Hastelloy X, HAYNES 230, and HAYNES 188 with a chromium content wCr > 8% show severe corrosive attack with complete chromium depletion along the near‐surface layer and partially along grain boundaries. The results show that chromium forms chromium oxide with impurities of oxygen and water vapor at low oxygen partial pressures. This initiates an accelerated corrosion of the alloying elements in the matrix of Ni, Cr, Mo, Fe, and Co, due to chlorine formation. The influence of the composition of nickel‐base alloys on the corrosion resistance is discussed based on the comparison of the gravimetric measurements and thermodynamic calculations.

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Homoepitaxial Growth of Large‐Scale Highly Organized Transition Metal Dichalcogenide Patterns

et al. 2017

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Controllable growth of highly crystalline transition metal dichalcogenide (TMD) patterns with regular morphology and unique edge structure is highly desired and important for fundamental research and potential applications. Here, single-crystalline MoS flakes are reported with regular trigonal symmetric patterns that can be homoepitaxially grown on MoS monolayer via chemical vapor deposition. The highly organized MoS patterns are rhombohedral (3R)-stacked with the underlying MoS monolayer, and their boundaries are predominantly terminated by zigzag Mo edge structure. The epitaxial MoS crystals can be tailored from compact triangles to fractal flakes, and the pattern formation can be explained by the anisotropic growth rates of the S and Mo edges under low sulfur chemical potential. The 3R-stacked MoS pattern demonstrates strong second and third-harmonic-generation signals, which exceed those reported for monolayer MoS by a factor of 6 and 4, correspondingly. This homoepitaxial growth approach for making highly organized TMD patterns is also demonstrated for WS .

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High-temperature corrosion of metals in the salt and metallic melts containing rare earths

Cited by 4 publications

References 2 publications

Strain-modulated optical response in 2D MoSe2 made by Na-assisted CVD on glass

Strain-modulated optical response in 2D MoSe2 made by Na-assisted CVD on glass

Investigation on the Corrosion Behavior of Nickel‐Base Alloys in Molten Chlorides for Sensible Heat Energy Applications

Homoepitaxial Growth of Large‐Scale Highly Organized Transition Metal Dichalcogenide Patterns

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