Hard superconducting nitrides

被引：282
作者：
Chen, XJ
Struzhkin, VV
Wu, ZG
Somayazulu, M
Qian, J
Kung, S
Christensen, AN
Zhao, YS
Cohen, RE
Mao, HK
Hemley, RJ
机构：
[1] Carnegie Inst Sci, Geophys Lab, Washington, DC 20015 USA
[2] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA
[3] Los Alamos Natl Lab, Los Alamos Neutron Sci Ctr Div, Los Alamos, NM 87545 USA
[4] CALTECH, Dept Chem, Pasadena, CA 91126 USA
来源：
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA | 2005年 / 102卷 / 09期
关键词：
elasticity; elastic constants; equations of state; hardness; binary compounds;
D O I：
10.1073/pnas.0500174102
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
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) > c(12) > c(44) for NbN, but c(11) > c(44) > c(12) for HfN and ZrN, which are in good agreement with the neutron scattering data. The cubic delta-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.
引用
收藏
页码：3198 / 3201
页数：4
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