10 K NbN ADC for IR sensor applications

Durand, D.J.; Dalrymple, B.J.; Eaton, L. R.; Spargo, J.W.; Wire, M.S.; Dowdy, M. W.; Ressler, Michael E.

doi:10.1016/s0964-1807(99)00037-x

Cited by 3 publications

(3 citation statements)

References 6 publications

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“…Currently, NbN films are being examined in applications of radio frequency superconducting accelerator cavities (26), superconducting quantum interference devices (27), superconducting hot-electron photodetectors (28), and IR sensors (29). Our results reveal that this material is highly incompressible compared with HfN and ZrN because of its high values of the bulk modulus and Vickers hardness.…”

Section: Resultsmentioning

confidence: 85%

Hard superconducting nitrides

Chen

Struzhkin²,

Wu³

et al. 2005

Proc. Natl. Acad. Sci. U.S.A.

269

137

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Detailed study of the equation of state, elasticity, and hardness of selected superconducting transition-metal nitrides reveals interesting correlations among their physical properties. Both the bulk modulus and Vickers hardness are found to decrease with increasing zero-pressure volume in NbN, HfN, and ZrN. The computed elastic constants from first principles satisfy c11 > c12 > c44 for NbN, but c11 > c44 > c12 for HfN and ZrN, which are in good agreement with the neutron scattering data. The cubic ␦-NbN superconducting phase possesses a bulk modulus of 348 GPa, comparable to that of cubic boron nitride, and a Vickers hardness of 20 GPa, which is close to sapphire. Theoretical calculations for NbN show that all elastic moduli increase monotonically with increasing pressure. These results suggest technological applications of such materials in extreme environments.elasticity ͉ elastic constants ͉ equations of state ͉ hardness ͉ binary compounds H ard superconducting materials are of considerable interest for specific electronic applications. Superconductivity has been discovered in diamond, generally believed to be the hardest material having very high shear and bulk moduli (1, 2), with a superconducting transition temperature (T c ) near 4 K when doped with boron (3). However, the transition-metal compounds having the sodium chloride (B1) structure (e.g., NbN, NbC, ZrN, or HfN) are also hard superconductors but with relatively higher T c s. The transition temperatures of solid solutions of NbN and NbC can reach a maximum value of 17.8 K, which is close to those found for the cubic A15-type compounds such as Nb 3 Sn and V 3 Si (4). The refractory characteristics of these transitionmetal nitrides and carbides have been applied as coatings to increase the wear resistance, for instance, in cutting tools as well as for magnetic storage devices. The unusual hardness enhancement in these materials has been theoretically shown to originate from a particular -band of bonding states between the nonmetal p orbitals and the metal d orbitals that strongly resists shearing strains (5). At the moment, there is a need to investigate elastic and mechanical properties of these superconductors under simulated extreme working conditions.Here, we report both experimental and theoretical studies of the equation of state, elasticity, and hardness of selected superconducting transition-metal nitrides. We find that the cubic ␦-NbN superconducting phase possesses a bulk modulus of 348 GPa, comparable to that of cubic boron nitride, and a Vickers hardness of 20 GPa, which is close to sapphire (Al 2 O 3 ) (6). The results indicate that these nitrides are good candidates for engineering hard superconducting materials. Experimental and Theoretical DetailsEquations of state studies were based on angle-dispersive synchrotron powder x-ray diffractometry with a diamond anvil cell. The diffraction experiments were carried out at the synchrotron beam line 16ID-B of the Advanced Photon Source High Pressure Collaborative Access Team. A 500 ϫ 500-m ...

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Section: Resultsmentioning

confidence: 85%

Hard superconducting nitrides

Chen

Struzhkin²,

Wu³

et al. 2005

Proc. Natl. Acad. Sci. U.S.A.

269

137

View full text Add to dashboard Cite

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“…Transition-metal nitrides have received more attention for being the powerful candidates of superhard materials and potential technological applications. [1][2][3][4][5] There are lots of theoretical and experimental efforts focus on the transition-metal nitrides.…”

Section: Introductionmentioning

confidence: 99%

“…Transition-metal nitrides have received more attention as powerful candidates of superhard materials and potential technological applications. [1][2][3][4][5] There are lots of theoretical and experimental efforts devoted to the transitionmetal nitrides. Vanadium nitride (VN) adopting the NaCl type structure has been a leading subject of many investigations on such transition-metal compounds because of its high melting temperature, electrical conductivity, and chemical stability.…”

Section: Introductionmentioning

confidence: 99%

Elastic and thermodynamic properties of vanadium nitride under pressure and the effect of metallic bonding on its hardness

Pu¹,

Zhou²,

Dai-Xiao³

et al. 2014

Chinese Phys. B

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Pressure-induced structural transition and thermodynamic properties of NbN and effect of metallic bonding on its hardness

Wang

Kuang

Huang

et al. 2010

EPL

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Using first-principles calculations, the elastic constants, thermodynamic properties and structural phase transition of NbN under high pressure are investigated by means of the pseudopotential plane-waves method, in addition to the effect of metallic bonding on its hardness. Three candidate structures are chosen to investigate NbN, namely, rocksalt (NaCl), NiAs and WC types. On the basis of the third-order Birch-Murnaghan equation of states, the transition pressure Pt (Pt = 200.64 GPa) between the WC phase and the NaCl phase of NbN is predicted for the first time. Elastic constants, formation enthalpies, shear modulus, Young's modulus, and Poisson's ratio of NbN are derived. The calculated results are found to be in good agreement with the available experimental data and theoretical values. According to the quasi-harmonic Debye model, the Debye temperature under high pressure is derived from the average sound velocity. Moreover, the effect of metallic bonding on the hardness of NbN is investigated and the hardness shows a gradual decrease rather than increase under compression. This is a quantitative investigation on the structural and thermodynamic properties of NbN, and it still awaits experimental confirmation.

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10 K NbN ADC for IR sensor applications

Cited by 3 publications

References 6 publications

Hard superconducting nitrides

Hard superconducting nitrides

Elastic and thermodynamic properties of vanadium nitride under pressure and the effect of metallic bonding on its hardness

Pressure-induced structural transition and thermodynamic properties of NbN and effect of metallic bonding on its hardness

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