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Hexagonal-structured ε-NbN: ultra-incompressibility, high shear rigidity, and a possible hard superconducting material
Exploring the structural stability and elasticity of hexagonal ε-NbN helps discover correlations among its physical properties for scientific and technological applications. Here, for the first time, we measured the ultra-incompressibility and high shear rigidity of polycrystalline hexagonal ε-NbN u...
Autores principales: | , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group
2015
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4450584/ https://www.ncbi.nlm.nih.gov/pubmed/26028439 http://dx.doi.org/10.1038/srep10811 |
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author | Zou, Yongtao Wang, Xuebing Chen, Ting Li, Xuefei Qi, Xintong Welch, David Zhu, Pinwen Liu, Bingbing Cui, Tian Li, Baosheng |
author_facet | Zou, Yongtao Wang, Xuebing Chen, Ting Li, Xuefei Qi, Xintong Welch, David Zhu, Pinwen Liu, Bingbing Cui, Tian Li, Baosheng |
author_sort | Zou, Yongtao |
collection | PubMed |
description | Exploring the structural stability and elasticity of hexagonal ε-NbN helps discover correlations among its physical properties for scientific and technological applications. Here, for the first time, we measured the ultra-incompressibility and high shear rigidity of polycrystalline hexagonal ε-NbN using ultrasonic interferometry and in situ X-ray diffraction, complemented with first-principles density-functional theory calculations up to 30 GPa in pressure. Using a finite strain equation of state approach, the elastic bulk and shear moduli, as well as their pressure dependences are derived from the measured velocities and densities, yielding B(S0) = 373.3(15) GPa, G(0) = 200.5(8) GPa, ∂B(S)/∂P = 3.81(3) and ∂G/∂P = 1.67(1). The hexagonal ε-NbN possesses a very high bulk modulus, rivaling that of superhard material cBN (B(0) = 381.1 GPa). The high shear rigidity is comparable to that for superhard γ-B (G(0) = 227.2 GPa). We found that the crystal structure of transition-metal nitrides and the outmost electrons of the corresponding metals may dominate their pressure dependences in bulk and shear moduli. In addition, the elastic moduli, Vickers hardness, Debye temperature, melting temperature and a possible superconductivity of hexagonal ε-NbN all increase with pressures, suggesting its exceptional suitability for applications under extreme conditions. |
format | Online Article Text |
id | pubmed-4450584 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2015 |
publisher | Nature Publishing Group |
record_format | MEDLINE/PubMed |
spelling | pubmed-44505842015-06-10 Hexagonal-structured ε-NbN: ultra-incompressibility, high shear rigidity, and a possible hard superconducting material Zou, Yongtao Wang, Xuebing Chen, Ting Li, Xuefei Qi, Xintong Welch, David Zhu, Pinwen Liu, Bingbing Cui, Tian Li, Baosheng Sci Rep Article Exploring the structural stability and elasticity of hexagonal ε-NbN helps discover correlations among its physical properties for scientific and technological applications. Here, for the first time, we measured the ultra-incompressibility and high shear rigidity of polycrystalline hexagonal ε-NbN using ultrasonic interferometry and in situ X-ray diffraction, complemented with first-principles density-functional theory calculations up to 30 GPa in pressure. Using a finite strain equation of state approach, the elastic bulk and shear moduli, as well as their pressure dependences are derived from the measured velocities and densities, yielding B(S0) = 373.3(15) GPa, G(0) = 200.5(8) GPa, ∂B(S)/∂P = 3.81(3) and ∂G/∂P = 1.67(1). The hexagonal ε-NbN possesses a very high bulk modulus, rivaling that of superhard material cBN (B(0) = 381.1 GPa). The high shear rigidity is comparable to that for superhard γ-B (G(0) = 227.2 GPa). We found that the crystal structure of transition-metal nitrides and the outmost electrons of the corresponding metals may dominate their pressure dependences in bulk and shear moduli. In addition, the elastic moduli, Vickers hardness, Debye temperature, melting temperature and a possible superconductivity of hexagonal ε-NbN all increase with pressures, suggesting its exceptional suitability for applications under extreme conditions. Nature Publishing Group 2015-06-01 /pmc/articles/PMC4450584/ /pubmed/26028439 http://dx.doi.org/10.1038/srep10811 Text en Copyright © 2015, Macmillan Publishers Limited http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ |
spellingShingle | Article Zou, Yongtao Wang, Xuebing Chen, Ting Li, Xuefei Qi, Xintong Welch, David Zhu, Pinwen Liu, Bingbing Cui, Tian Li, Baosheng Hexagonal-structured ε-NbN: ultra-incompressibility, high shear rigidity, and a possible hard superconducting material |
title | Hexagonal-structured ε-NbN: ultra-incompressibility, high shear rigidity, and a possible hard superconducting material |
title_full | Hexagonal-structured ε-NbN: ultra-incompressibility, high shear rigidity, and a possible hard superconducting material |
title_fullStr | Hexagonal-structured ε-NbN: ultra-incompressibility, high shear rigidity, and a possible hard superconducting material |
title_full_unstemmed | Hexagonal-structured ε-NbN: ultra-incompressibility, high shear rigidity, and a possible hard superconducting material |
title_short | Hexagonal-structured ε-NbN: ultra-incompressibility, high shear rigidity, and a possible hard superconducting material |
title_sort | hexagonal-structured ε-nbn: ultra-incompressibility, high shear rigidity, and a possible hard superconducting material |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4450584/ https://www.ncbi.nlm.nih.gov/pubmed/26028439 http://dx.doi.org/10.1038/srep10811 |
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