Structural, electronic, and mechanical properties of niobium nitride prepared by thermal diffusion in nitrogen

Ufuktepe, Y.; Farha, Ashraf Hassan; Kimura, S.; Hajiri, Tetsuya; Karadağ, Faruk; Mamun, Abdullah Al; Elmustafa, A. A.; Myneni, Ganapati Rao; Elsayed-Ali, Hani E.

doi:10.1016/j.matchemphys.2013.05.029

Cited by 32 publications

(18 citation statements)

References 24 publications

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“…3 shows the fitted XPS spectra of N 1s on the surface of the as-deposited coatings deposited at P N2 of 5%, 10% and 20%. The binding energies of the N 1s shown in the coatings at P N2 of 5% and 20% are located at 397.0 and 397.4 eV, which are consistent with the previously reported values of Nb 2 N [29] and NbN [28], respectively. For the coatings at P N2 of 10%, the fitted two peaks in N 1s spectrum are attributed to the mixture of Nb 2 N and NbN, which agrees well with the results of Nb 3d spectrum in Fig.…”

Section: Chemical and Phase Compositions Of The Nbn X Coatingssupporting

confidence: 91%

“…Two doublets in Fig. 2(c) could be attributed to Nb 2 N and NbN (Nb 3d 5/2 of 203.2 eV and Nb 3d 3/2 of 205.9 eV [28]), respectively. The spectra of the coatings deposited at P N2 of 20% (Fig.…”

Section: Chemical and Phase Compositions Of The Nbn X Coatingsmentioning

confidence: 98%

“…All the Nb 3d peaks were fitted as pairs of spineorbit split sub-peaks with a separation of 2.7 eV between the Nb 3d 5/2 and Nb 3d 3/2 components. The ratio of the area of the 3d 5/2 component over that of the 3d 3/2 component was fixed at 3:2 [28,29]. In Fig.…”

Section: Chemical and Phase Compositions Of The Nbn X Coatingsmentioning

confidence: 99%

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Microstructure, mechanical properties and oxidation behaviors of magnetron sputtered NbNx coatings

Zhang

et al. 2016

Journal of Alloys and Compounds

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Section: Chemical and Phase Compositions Of The Nbn X Coatingssupporting

confidence: 91%

Section: Chemical and Phase Compositions Of The Nbn X Coatingsmentioning

confidence: 98%

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Microstructure, mechanical properties and oxidation behaviors of magnetron sputtered NbNx coatings

Zhang

et al. 2016

Journal of Alloys and Compounds

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“…Such a passivating layer was not present in the sample under test, as confirmed by the regrowth of the oxides NbO 2 and Nb 2 O 5 after it was reexposed to air. Moreover, in contrast to what was observed for cavitygrade Nb upon high-temperature annealing, where rectangular-and triangular-shaped precipitates were observed at the surface [10,14], no precipitates were detected by SEM after infusion [see Fig. S1(a) in Supplemental Material [34]].…”

Section: B Nitrogen Infusionmentioning

confidence: 99%

“…Most of the studies found in the literature address N and Nb interactions at high temperatures [11][12][13][14]. Nonetheless, few reports detail investigations of Nb single crystals under low N 2 pressures and of cavity-grade Nb after undergoing real cavity-treatment conditions.…”

Section: Introductionmentioning

confidence: 99%

Niobium near-surface composition during nitrogen infusion relevant for superconducting radio-frequency cavities

Semione

Pandey

Tober

et al. 2019

Phys. Rev. Accel. Beams

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A detailed study of the near-surface structure and composition of Nb, the material of choice for superconducting radio-frequency accelerator (SRF) cavities, is of great importance in order to understand the effects of different treatments applied during cavity production. By means of surface-sensitive techniques such as grazing incidence diffuse x-ray scattering, x-ray reflectivity, and x-ray photoelectron spectroscopy, single-crystalline Nb(100) samples were investigated in and ex situ during annealing in an ultrahigh vacuum as well as in nitrogen atmospheres with temperatures and pressures similar to the ones employed in real Nb cavity treatments. Annealing of Nb specimens up to 800°C in a vacuum promotes a partial reduction of the natural surface oxides (Nb 2 O 5 , NbO 2 , and NbO) into NbO. Upon cooling to 120°C, no evidence of nitrogen-rich layers was detected after nitrogen exposure times of up to 48 h. An oxygen enrichment below the Nb-oxide interface and posterior diffusion of oxygen species towards the Nb matrix, along with a partial reduction of the natural surface oxides, was observed upon a stepwise annealing up to 250°C. Nitrogen introduction to the system at 250°C promotes neither N diffusion into the Nb matrix nor the formation of new surface layers. Upon further heating to 500°C in a nitrogen atmosphere, the growth of a new subsurface Nb x N y layer was detected. These results shed light on the composition of the near-surface region of Nb after low-temperature nitrogen treatments, which are reported to lead to a performance enhancement of SRF cavities.

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Niobium Nitride Nb₄N₅ as a New High‐Performance Electrode Material for Supercapacitors

et al. 2015

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Supercapacitors suffer either from low capacitance for carbon or derivate electrodes or from poor electrical conductivity and electrochemical stability for metal oxide or conducting polymer electrodes. Transition metal nitrides possess fair electrical conductivity but superior chemical stability, which may be desirable candidates for supercapacitors. Herein, niobium nitride, Nb4N5, is explored to be an excellent capacitive material for the first time. An areal capacitance of 225.8 mF cm−2, with a reasonable rate capability (60.8% retention from 0.5 to 10 mA cm−2) and cycling stability (70.9% retention after 2000 cycles), is achieved in Nb4N5 nanochannels electrode with prominent electrical conductivity and electrochemical activity. Faradaic pseudocapacitance is confirmed by the mechanistic studies, deriving from the proton incorporation/chemisorption reaction owing to the copious +5 valence Nb ions in Nb4N5. Moreover, this Nb4N5 nanochannels electrode with an ultrathin carbon coating exhibits nearly 100% capacitance retention after 2000 CV cycles, which is an excellent cycling stability for metal nitride materials. Thus, the Nb4N5 nanochannels are qualified for a candidate for supercapacitors and other energy storage applications.

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Structural, electronic, and mechanical properties of niobium nitride prepared by thermal diffusion in nitrogen

Cited by 32 publications

References 24 publications

Microstructure, mechanical properties and oxidation behaviors of magnetron sputtered NbNx coatings

Microstructure, mechanical properties and oxidation behaviors of magnetron sputtered NbNx coatings

Niobium near-surface composition during nitrogen infusion relevant for superconducting radio-frequency cavities

Niobium Nitride Nb₄N₅ as a New High‐Performance Electrode Material for Supercapacitors

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Structural, electronic, and mechanical properties of niobium nitride prepared by thermal diffusion in nitrogen

Cited by 32 publications

References 24 publications

Microstructure, mechanical properties and oxidation behaviors of magnetron sputtered NbNx coatings

Microstructure, mechanical properties and oxidation behaviors of magnetron sputtered NbNx coatings

Niobium near-surface composition during nitrogen infusion relevant for superconducting radio-frequency cavities

Niobium Nitride Nb4N5 as a New High‐Performance Electrode Material for Supercapacitors

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Product

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Niobium Nitride Nb₄N₅ as a New High‐Performance Electrode Material for Supercapacitors