Tunneling and critical-magnetic-field study of superconducting NbC thin films

Pechen, E.V.; Krasnosvobodtsev, S. I.; Shabanova, N. P.; Ekimov, E. V.; Varlashkin, A. V.; Nozdrin, V. S.; Tschovrebov, A.M.; Golovashkin, A. I.

doi:10.1016/0921-4534(94)92476-7

Cited by 31 publications

(18 citation statements)

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“…Niobium carbide is a very important material with promising properties, such as outstanding hardness, a high melting point (3610 • C), good resistance to chemical attack, good catalytic properties and excellent electronic conductivity [1][2][3]. Therefore, it can find applications in many fields, such as the mechanical, chemical, and microelectronic industries.…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties and rapid consolidation of binderless niobium carbide

Kim

Woo

Yoon

et al. 2009

Journal of Alloys and Compounds

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Section: Introductionmentioning

confidence: 99%

Mechanical properties and rapid consolidation of binderless niobium carbide

Kim

Woo

Yoon

et al. 2009

Journal of Alloys and Compounds

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“…Therefore, transition metal carbides may find a wide range of potential applications in many fields. For example, NbC is not only a catalyst but also a superconducting material [2], VC and Mo 2 C are powerful catalysts and considered potential substitutes of noble metals in catalysis [3,4], and TiC can be used for anti-wear coating on cutting tools [5]. Various methods for the synthesis of transition metal carbides have been reported, such as direct carbonization of metal [6e8], chemical vapor deposition [9,10], carbothermal reduction of metal oxides with carbon at high temperature [11e13], solid state metathesis [14,15], a thermal reduction of metal oxides and carbonate with Mg [16], and coreduction of metal halides and C x Cl y with sodium [17].…”

Section: Introductionmentioning

confidence: 99%

A thermal reduction route to nanocrystalline transition metal carbides from waste polytetrafluoroethylene and metal oxides

Wang

Mei

et al. 2012

Materials Chemistry and Physics

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“…Among the transition metal nitrides and carbides, both NbN and NbC have attracted considerable attention and are evaluated for potential industrial applications. They have gained interest due to their relatively high superconducting transition temperatures of T c = 17.3 K [7] and 12 K [8], respectively, with potential applications in superconducting electronics [9,10]. They are also promising as protective coating materials due to their high chemical stability [11], high melting points of 2204 [12] and 3600°C [13], respectively, and high hardness with reported values that range from 7-48.5 GPa for NbN [14][15][16][17][18][19] and from 11.3-36.8 GPa for NbC [20,21].…”

Section: Introductionmentioning

confidence: 99%

Epitaxial NbC N1−(001) layers: Growth, mechanical properties, and electrical resistivity

Zhang

Balasubramanian

Ozsdolay

et al. 2015

Surface and Coatings Technology

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HardnessNbC x N 1−x layers were deposited on MgO(001) by reactive magnetron co-sputtering from Nb and graphite targets in 5 mTorr pure N 2 at T s = 600-1000°C. The anion-to-Nb ratio of 1.09 ± 0.05 is independent of T s and indicates a nearly stoichiometric rock-salt structure Nb(N,C) solid solution. In contrast, the C-to-N ratio increases from 0.20-0.59 for T s = 600-1000°C, which is attributed to a low C sticking probability at high N surface coverage at low T s . Layers grown at T s ≥ 700°C are epitaxial single-crystals with a cube-on-cube relationship to the substrate, (001) NbCN ||(001) MgO and [100] NbCN ||[100] MgO , as determined from X-ray diffraction θ-2θ and ϕ-scans. Reciprocal space mapping on a NbC 0.37 N 0.63 layer deposited at T s = 1000°C indicates an in-plane compressive strain of −0.4% and a relaxed lattice constant of 4.409 ± 0.009 Å. The lattice constant of NbC x N 1−x increases with x, consistent with a linear increase predicted by first-principles density functional calculations. The calculated bulk modulus, 307 GPa for NbN and 300 GPa for NbC, is nearly independent of x. Similarly, c 11 increases slightly from 641 to 666 GPa, but c 12 decreases considerably from 140 to 117 GPa, and c 44 more than doubles from 78 to 171 GPa as x increases from 0 to 1, indicating a transition from ductile NbN to brittle NbC. This also results in an increase in the predicted isotropic elastic modulus from 335 to 504 GPa, which is in good agreement with the measured 350 ± 12 GPa for NbC x N 1−x (001) with x = 0.19-0.31. The hardness H = 22 ± 2 GPa of epitaxial NbC x N 1−x layers is nearly independent of x = 0.19-0.37 and T s = 700-1000°C, but is reduced to H = 18.2 ± 0.8 GPa for the nanocrystalline layer deposited at T s = 600°C. The electrical resistivity decreases strongly with increasing T s b 800°C, due to increasing crystalline quality, and is 262 ± 21 μΩ-cm at room temperature and 299 ± 22 μΩ-cm at 77 K for T s ≥ 800°C, indicating weak carrier localization due to the random distribution of C atoms on anion sites.

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Tunneling and critical-magnetic-field study of superconducting NbC thin films

Cited by 31 publications

References 1 publication

Mechanical properties and rapid consolidation of binderless niobium carbide

Mechanical properties and rapid consolidation of binderless niobium carbide

A thermal reduction route to nanocrystalline transition metal carbides from waste polytetrafluoroethylene and metal oxides

Epitaxial NbC N1−(001) layers: Growth, mechanical properties, and electrical resistivity

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