Hard superconducting nitrides

Xiao Jia Chen; Viktor V. Struzhkin; Zhigang Wu; Maddury Somayazulu; Jiang Qian; Simon Kung; Axel Nørlund Christensen; Yusheng Zhao; Ronald E. Cohen; Ho Kwang Mao; Russell J. Hemley

doi:10.1073/pnas.0500174102

Hard superconducting nitrides

Xiao Jia Chen
, Viktor V. Struzhkin
, Zhigang Wu
, Maddury Somayazulu
, Jiang Qian
, Simon Kung
, Axel Nørlund Christensen
, Yusheng Zhao
, Ronald E. Cohen
, Ho Kwang Mao
, Russell J. Hemley^*

^*Corresponding author for this work

Carnegie Institution of Washington
United States Department of Energy
California Institute of Technology

Research output: Contribution to journal › Article › peer-review

304 Scopus citations

Abstract

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 c ₁₁ > c₁₂ > c₄₄ for NbN, but c ₁₁ > c₄₄ > c₁₂ for HfN and ZrN, which are in good agreement with the neutron scattering data. The cubic δ-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.

Original language	English
Pages (from-to)	3198-3201
Number of pages	4
Journal	Proceedings of the National Academy of Sciences of the United States of America
Volume	102
Issue number	9
DOIs	https://doi.org/10.1073/pnas.0500174102
State	Published - 1 Mar 2005
Externally published	Yes

Keywords

Binary compounds
Elastic constants
Elasticity
Equations of state
Hardness

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10.1073/pnas.0500174102

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title = "Hard superconducting nitrides",

abstract = "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 c 11 > c12 > c44 for NbN, but c 11 > c44 > c12 for HfN and ZrN, which are in good agreement with the neutron scattering data. The cubic δ-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.",

keywords = "Binary compounds, Elastic constants, Elasticity, Equations of state, Hardness",

author = "Chen, \{Xiao Jia\} and Struzhkin, \{Viktor V.\} and Zhigang Wu and Maddury Somayazulu and Jiang Qian and Simon Kung and Christensen, \{Axel N{\o}rlund\} and Yusheng Zhao and Cohen, \{Ronald E.\} and Mao, \{Ho Kwang\} and Hemley, \{Russell J.\}",

year = "2005",

month = mar,

day = "1",

doi = "10.1073/pnas.0500174102",

language = "英语",

volume = "102",

pages = "3198--3201",

journal = "Proceedings of the National Academy of Sciences of the United States of America",

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TY - JOUR

T1 - Hard superconducting nitrides

AU - Chen, Xiao Jia

AU - Struzhkin, Viktor V.

AU - Wu, Zhigang

AU - Somayazulu, Maddury

AU - Qian, Jiang

AU - Kung, Simon

AU - Christensen, Axel Nørlund

AU - Zhao, Yusheng

AU - Cohen, Ronald E.

AU - Mao, Ho Kwang

AU - Hemley, Russell J.

PY - 2005/3/1

Y1 - 2005/3/1

N2 - 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 c 11 > c12 > c44 for NbN, but c 11 > c44 > c12 for HfN and ZrN, which are in good agreement with the neutron scattering data. The cubic δ-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.

AB - 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 c 11 > c12 > c44 for NbN, but c 11 > c44 > c12 for HfN and ZrN, which are in good agreement with the neutron scattering data. The cubic δ-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.

KW - Binary compounds

KW - Elastic constants

KW - Elasticity

KW - Equations of state

KW - Hardness

UR - https://www.scopus.com/pages/publications/20044384194

U2 - 10.1073/pnas.0500174102

DO - 10.1073/pnas.0500174102

M3 - 文章

AN - SCOPUS:20044384194

SN - 0027-8424

VL - 102

SP - 3198

EP - 3201

JO - Proceedings of the National Academy of Sciences of the United States of America

JF - Proceedings of the National Academy of Sciences of the United States of America

IS - 9

ER -

Hard superconducting nitrides

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Keywords

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