Based on the particle swarm optimization algorithm on crystal structural prediction, we first predict that TaN undergoes a phase transition from the experimental θ-TaN to a hexagonal P63/mmc structure at 87.5 GPa with volume drop of 1.6%. This hexagonal P63/mmc structure is isostructural with anti-NiAs and can be quenchable to ambient pressure by further phonon dispersions calculations. The Young's modulus E and shear modulus G as a function of crystal orientation for TaN have thus been systematically investigated. The calculated mechanical properties suggest that the P63/mmc-TaN is ultra-incompressible and hard due to its high bulk modulus (336 GPa), large shear modulus (214 GPa), originating from a staking of “N-Ta-N” sandwiches layers linked by strong covalent Ta-N bonding.
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28 February 2013
Research Article|
February 22 2013
Hexagonal high-pressure phase of tantalum mononitride predicted from first principles
Haiyan Yan;
Haiyan Yan
a)
1
College of Chemistry and Chemical Engineering, Baoji University of Arts and Sciences
, Baoji 721013, People's Republic of China
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Chunsheng Dou;
Chunsheng Dou
2Department of Physics and information Technology,
Baoji University of Arts and Sciences
, Baoji 721016, People's Republic of China
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Meiguang Zhang;
Meiguang Zhang
a)
2Department of Physics and information Technology,
Baoji University of Arts and Sciences
, Baoji 721016, People's Republic of China
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Hui Wang
Hui Wang
3National Laboratory of Superhard Materials,
Jilin University
, Changchun 130012, People's Republic of China
4
Key Laboratory of Rare Earth Chemistry and Physics, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences
, Changchun 130022, People's Republic of China
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a)
Authors to whom correspondence should be addressed. Electronic addresses: hyyan1102@163.com and zhmgbj@126.com.
J. Appl. Phys. 113, 083502 (2013)
Article history
Received:
December 08 2012
Accepted:
February 05 2013
Citation
Haiyan Yan, Chunsheng Dou, Meiguang Zhang, Hui Wang; Hexagonal high-pressure phase of tantalum mononitride predicted from first principles. J. Appl. Phys. 28 February 2013; 113 (8): 083502. https://doi.org/10.1063/1.4792731
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