Interstitial nitrides revisited – A simple synthesis of M Mo3N (M = Fe, Co, Ni)

Conway, Jack O.; Prior, Timothy J.

doi:10.1016/j.jallcom.2018.09.307

Cited by 27 publications

(21 citation statements)

References 41 publications

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“…1(c). The reported β-Mn structure (P 4 1 32) [28] fits the obtained diffraction patterns very well. Sharp diffraction peaks are observed, and no peaks violating this model or suggesting the presence of secondary phases are observed.…”

Section: A Crystal Structuresupporting

confidence: 75%

Controlling Dzyaloshinskii-Moriya interactions in the skyrmion host candidates FePd1−xPtxMo3N

Kautzsch

Bocarsly

Felser

et al. 2020

Phys. Rev. Materials

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Ferromagnets crystallizing in structures described by chiral cubic space groups, including compounds with the B20 or β-Mn structures, are known to host long-period chiral spin textures such as skyrmion lattices. These spin textures are stabilized by a competition between ferromagnetic exchange and antisymmetric Dyzaloshinskii-Moriya (DM) exchange, which is enhanced by the spin-orbit coupling associated with high-atomic-number elements. For real-world application, it is desirable to find materials that can host compact skyrmion lattices at readily accessible temperatures. Here, we report on the crystal chemistry and magnetic phase diagrams of a family of compounds with the filled β-Mn structure, FePd1−xPtxMo3N with TC ranging from 175 K to 240 K. DC and AC magnetization measurements reveal magnetic phase diagrams consistent with the formation of a skyrmion pocket just below TC . The magnitudes of ferromagnetic and DM exchanges are determined from the phase diagrams, demonstrating that the introduction of increasing amounts of Pt can be used to increase spin-orbit coupling in order to control the expected skyrmion lattice parameter between 140 nm and 65 nm while simultaneously increasing TC .

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Section: A Crystal Structuresupporting

confidence: 75%

Controlling Dzyaloshinskii-Moriya interactions in the skyrmion host candidates FePd1−xPtxMo3N

Kautzsch

Bocarsly

Felser

et al. 2020

Phys. Rev. Materials

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“…Following is the equation for criterion: Fig S1 (ii)] indicates about the possible insertion/substitution of N atoms in the catalyst structure during ammonia synthesis. 7,18 Table S5. Stoichiometric formula of carbo-nitride of tested catalysts for ammonia synthesis based upon CHN analysis.…”

Section: Mears' External Heat Transfer Resistance Criterionmentioning

confidence: 99%

Strong Interfacial Electronic Interaction in the Transition-Metal/Mo₂C Catalyst for Enhanced Ammonia Synthesis at Ambient Pressure: Shift of the Rate Determining Step

Roy

Kumar

2020

ACS Appl. Energy Mater.

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The dissociation of nitrogen molecules over the catalyst surface is often treated as the reaction-limiting step for ammonia synthesis. Herein, we modified molybdenum carbide with transition metals (Fe and Co) to successfully shift the rate-determining step from dissociation of nitrogen molecules to the formation of −NH x species on the catalyst surface, which few catalysts have achieved. These catalysts illustrated stable performance for ammonia synthesis at ambient pressure. At 520 °C and 1 bar, the specific activity for Mo2C, Fe/Mo2C, and Co/Mo2C was calculated to be 8.58, 9.78, and 11.73 μmol h–1 m–2, respectively. Co/Mo2C showed the highest activity owing to its strong electron-donating ability to dissociate nitrogen molecules. X-ray photoelectron spectroscopy results suggested a strong interaction between molybdenum in the carbidic phase and the transition metals, signifying preferred migration of electrons from the transition metals to the Mo atoms. Such an interfacial phenomenon resembles to the electron metal–support interaction. Importantly, orders for hydrogen were positive, revealing that the catalyst surface was not poisoned by hydrogen. Further, characterization of spent catalysts disclosed that pyridinic and graphitic C–N bonds were present on the catalyst surface, which suggests that both Langmuir–Hinshelwood and Mars–van Krevelen mechanisms could co-exist and simultaneously contribute to generate ammonia.

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“…This is not the case for the filled β-Mn structured Ni 2 Mo 3 N, where the bulk lattice nitrogen has been shown to be unreactive, even at temperatures of 900 °C under 3:1 H 2 /Ar [12]. Furthermore, the loss of lattice nitrogen from the η-carbide structured Fe 3 Mo 3 N has been reported to be minimal under 3:1 H 2 /Ar up to 800 °C [14,15]. A comparison with the η-carbide structured Ni 3 Mo 3 N, which is isostructural with both Co 3 Mo 3 N and Fe 3 Mo 3 N, would be of further interest.…”

Section: Introductionmentioning

confidence: 99%

The Role of Composition and Phase upon the Lattice Nitrogen Reactivity of Ternary Molybdenum Nitrides

2021

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The reactivity of the lattice nitrogen in the filled β-Mn structured Co2Mo3N and the η-carbide structured Co3Mo3N and Fe3Mo3N has been investigated under 3:1 H2/Ar at temperatures up to 900 °C. The lattice nitrogen in Co3Mo3N was found to be reactive, as reported previously, whereas Co2Mo3N was shown to be stable up to 800 °C. Upon H2/Ar treatment at 900 °C, the Co2Mo3N, Co3Mo3N and Fe3Mo3N phases decomposed. These results suggest that both metal composition and phase have an influence on the bulk lattice nitrogen reactivity of the ternary nitrides.

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Interstitial nitrides revisited – A simple synthesis of M Mo3N (M = Fe, Co, Ni)

Cited by 27 publications

References 41 publications

Controlling Dzyaloshinskii-Moriya interactions in the skyrmion host candidates FePd1−xPtxMo3N

Controlling Dzyaloshinskii-Moriya interactions in the skyrmion host candidates FePd1−xPtxMo3N

Strong Interfacial Electronic Interaction in the Transition-Metal/Mo₂C Catalyst for Enhanced Ammonia Synthesis at Ambient Pressure: Shift of the Rate Determining Step

The Role of Composition and Phase upon the Lattice Nitrogen Reactivity of Ternary Molybdenum Nitrides

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Interstitial nitrides revisited – A simple synthesis of M Mo3N (M = Fe, Co, Ni)

Cited by 27 publications

References 41 publications

Controlling Dzyaloshinskii-Moriya interactions in the skyrmion host candidates FePd1−xPtxMo3N

Controlling Dzyaloshinskii-Moriya interactions in the skyrmion host candidates FePd1−xPtxMo3N

Strong Interfacial Electronic Interaction in the Transition-Metal/Mo2C Catalyst for Enhanced Ammonia Synthesis at Ambient Pressure: Shift of the Rate Determining Step

The Role of Composition and Phase upon the Lattice Nitrogen Reactivity of Ternary Molybdenum Nitrides

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Strong Interfacial Electronic Interaction in the Transition-Metal/Mo₂C Catalyst for Enhanced Ammonia Synthesis at Ambient Pressure: Shift of the Rate Determining Step