1
|
Feng Q, Xiao X, Dai W, Sun W, Ding K, Lu C. Predicted the structural diversity and electronic properties of Pt-N compounds under high pressure. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2023; 35:285501. [PMID: 37054735 DOI: 10.1088/1361-648x/acccc5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2022] [Accepted: 04/13/2023] [Indexed: 06/19/2023]
Abstract
The nitrogen-rich transition metal nitrides have attracted considerable attention due to their potential application as high energy density materials. Here, a systematic theoretical study of PtNxcompounds has been performed by combining first-principles calculations and particle swarm-optimized structure search method at high pressure. The results indicate that several unconventional stoichiometries of PtN2, PtN4, PtN5, and Pt3N4compounds are stabilized at moderate pressure of 50 GPa. Moreover, some of these structures are dynamically stable even when the pressure release to ambient pressure. TheP1-phase of PtN4and theP1-phase of PtN5can release about 1.23 kJ g-1and 1.71 kJ g-1, respectively, upon the decomposition into elemental Pt and N2. The electronic structure analysis shows that all crystal structures are indirect band gap semiconductors, except for the metallic Pt3N4withPcphase, and the metallic Pt3N4is a superconductor with estimated critical temperatureTcvalues of 3.6 K at 50 GPa. These findings not only enrich the understanding of transition metal platinum nitrides, but also provide valuable insights for the experimental exploration of multifunctional polynitrogen compounds.
Collapse
Affiliation(s)
- Quanchao Feng
- Department of Physics and Optoelectronic Engineering, Yangtze University, Jingzhou 434023, People's Republic of China
- School of Mathematics and Physics, Jingchu University of Technology, Jingmen 448000, People's Republic of China
| | - Xun Xiao
- Department of Physics and Optoelectronic Engineering, Yangtze University, Jingzhou 434023, People's Republic of China
| | - Wei Dai
- School of Mathematics and Physics, Jingchu University of Technology, Jingmen 448000, People's Republic of China
| | - Weiguo Sun
- College of Physics and Electronic Information & Henan Key Laboratory of Electromagnetic Transformation and Detection, Luoyang Normal University, Luoyang 471022, People's Republic of China
| | - Kewei Ding
- State Key Laboratory of Fluorine & Nitrogen Chemicals, Xi'an 710065, People's Republic of China
- Xi'an Modern Chemistry Research Institute, Xi'an 710065, People's Republic of China
| | - Cheng Lu
- School of Mathematics and Physics, China University of Geosciences (Wuhan), Wuhan 430074, People's Republic of China
| |
Collapse
|
2
|
Lucrezi R, Heil C. Superconductivity and strong anharmonicity in novel Nb-S phases. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2021; 33:174001. [PMID: 33429377 DOI: 10.1088/1361-648x/abda7a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/28/2020] [Accepted: 01/11/2021] [Indexed: 06/12/2023]
Abstract
In this work we explore the phase diagram of the binary Nb-S system from ambient pressures up to 250 GPa usingab initioevolutionary crystal structure prediction. We find several new stable compositions and phases, especially in the high-pressure regime, and investigate their electronic, vibrational, and superconducting properties. Our calculations show that all materials, besides the low-pressure phases of pure sulfur, are metals with low electron-phonon (ep) coupling strengths and critical superconducting temperatures below 15 K. Furthermore, we investigate the effects of phonon anharmonicity on lattice dynamics, ep interactions, and superconductivity for the novel high-pressure phase of Nb2S, demonstrating that the inclusion of anharmonicity stabilizes the lattice and enhances the ep interaction.
Collapse
Affiliation(s)
- Roman Lucrezi
- Institute of Theoretical and Computational Physics, Graz University of Technology, NAWI Graz, 8010 Graz, Austria
| | - Christoph Heil
- Institute of Theoretical and Computational Physics, Graz University of Technology, NAWI Graz, 8010 Graz, Austria
| |
Collapse
|
3
|
Du X, Yao Y, Wang J, Yang Q, Yang G. IrN 4 and IrN 7 as potential high-energy-density materials. J Chem Phys 2021; 154:054706. [PMID: 33557531 DOI: 10.1063/5.0036832] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Transition metal nitrides have attracted great interest due to their unique crystal structures and applications. Here, we predict two N-rich iridium nitrides (IrN4 and IrN7) under moderate pressure through first-principles swarm-intelligence structural searches. The two new compounds are composed of stable IrN6 octahedrons and interlinked with high energy polynitrogens (planar N4 or cyclo-N5). Balanced structural robustness and energy content result in IrN4 and IrN7 being dynamically stable under ambient conditions and potentially as high energy density materials. The calculated energy densities for IrN4 and IrN7 are 1.3 kJ/g and 1.4 kJ/g, respectively, comparable to other transition metal nitrides. In addition, IrN4 is predicted to have good tensile (40.2 GPa) and shear strengths (33.2 GPa), as well as adequate hardness (20 GPa). Moderate pressure for synthesis and ambient pressure recoverability encourage experimental realization of these two compounds in near future.
Collapse
Affiliation(s)
- Xin Du
- State Key Laboratory of Metastable Materials Science & Technology and Key Laboratory for Microstructural Material Physics of Hebei Province, School of Science, Yanshan University, Qinhuangdao 066004, China
| | - Yansun Yao
- Department of Physics and Engineering Physics, University of Saskatchewan, Saskatoon, Saskatchewan S7N 5E2, Canada
| | - Jing Wang
- State Key Laboratory of Metastable Materials Science & Technology and Key Laboratory for Microstructural Material Physics of Hebei Province, School of Science, Yanshan University, Qinhuangdao 066004, China
| | - Qiuping Yang
- State Key Laboratory of Metastable Materials Science & Technology and Key Laboratory for Microstructural Material Physics of Hebei Province, School of Science, Yanshan University, Qinhuangdao 066004, China
| | - Guochun Yang
- State Key Laboratory of Metastable Materials Science & Technology and Key Laboratory for Microstructural Material Physics of Hebei Province, School of Science, Yanshan University, Qinhuangdao 066004, China
| |
Collapse
|
4
|
Asano S, Niwa K, Sasaki T, Gaida NA, Hasegawa M. Thermal Expansion of Incompressible U 2S 3-Type Nb 2N 3 Synthesized in a Diamond Anvil Cell. Inorg Chem 2020; 59:7915-7918. [PMID: 32463665 DOI: 10.1021/acs.inorgchem.0c01057] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A novel niobium nitride, U2S3-type Nb2N3, has been successfully synthesized by nitridation of δ-NbN above approximately 30 GPa in a laser-heated diamond anvil cell. Nb2N3 crystallizes in the same orthorhombic structure (space group: Pnma) as η-Ta2N3. Nb2N3 consists of regular-shaped polyhedra, and the bulk modulus has been determined to K0 = 300(2) GPa. The low-temperature X-ray diffraction measurements have been successfully conducted for the tiny novel Nb2N3 between 297.7(5) and 106.3(3) K under ambient pressure. Nb2N3 shows no structural phase transition down to 106.3(3) K, and investigation of the linear thermal expansion coefficients yields αa = 3.36(9) × 10-6 K-1, αb = 5.39(10) × 10-6 K-1, αc = 6.77(15) × 10-6 K-1, respectively. Our study reveals that the incompressible novel nitride shows low thermal expansion behavior, which offers new insights for the development of functional nitrides and their crystal chemistry.
Collapse
Affiliation(s)
- Shuto Asano
- Department of Materials Physics, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8603, Japan
| | - Ken Niwa
- Department of Materials Physics, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8603, Japan
| | - Takuya Sasaki
- Department of Materials Physics, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8603, Japan
| | - Nico Alexander Gaida
- Department of Materials Physics, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8603, Japan
| | - Masashi Hasegawa
- Department of Materials Physics, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8603, Japan
| |
Collapse
|
5
|
Xu C, Yu H, Kuo B, Ma S, Xiao X, Li D, Duan D, Jin X, Liu B, Cui T. Emergent property of high hardness for C-rich ruthenium carbides: partial covalent Ru-Ru bonds. Phys Chem Chem Phys 2018; 20:6108-6115. [PMID: 29442102 DOI: 10.1039/c7cp07835h] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Hard materials are being investigated all the time by combining transition metals with light elements. Combining a structure search with first-principles functional calculations, we first discovered three stable stoichiometric C-rich ruthenium carbides in view of three synthesis routes, namely, the ambient phases of Ru2C3 and RuC, and two high pressure phases of RuC4. There is a phase transition of RuC4 from the P3[combining macron]m1 structure to the R3[combining macron]m structure above 98 GPa. The calculations of elastic constants and phonon dispersions show their mechanical and dynamical stability. The large elastic modulus, high Debye temperature and the estimated hardness values suggest that these hard ruthenium carbides have good mechanical properties. The analyses of electronic structure and chemical bonding indicate that chemical bonding, not carbon content, is the key factor for the hardness in these metallic C-rich ruthenium carbides. The partial covalent Ru-C bonds and strong covalent C-C bonds are responsible for the high hardness. Moreover, the emergence of partial covalent Ru-Ru bonds can enhance the hardness of RuC, while the ionic Ru-Ru bonds can weaken the hardness of Ru2C3.
Collapse
Affiliation(s)
- Chunhong Xu
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun, 130012, People's Republic of China.
| | | | | | | | | | | | | | | | | | | |
Collapse
|
6
|
Yu R, Sun E, Jiao L, Cai Y, Wang H, Yao Y. Crystal structures of transition metal pernitrides predicted from first principles. RSC Adv 2018; 8:36412-36421. [PMID: 35558939 PMCID: PMC9088874 DOI: 10.1039/c8ra07814a] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2018] [Accepted: 10/19/2018] [Indexed: 11/21/2022] Open
Abstract
We have extensively explored the stable crystal structures of early-transition metal pernitrides (TMN2, TM = Ti, V, Cr, Mn, Zr, Nb, Mo, Hf, and Ta) at ambient and high pressures using effective CALYPSO global structure search algorithm in combination with first-principles calculations. We identified for the first time the ground-state structures of MnN2, TaN2, NbN2, VN2, ZrN2, and HfN2 pernitrides, and proposed their synthesis pressures. All predicted crystal structures contain encapsulated N2 dumbbells in which the two N atoms are singly bonded to a [N2]4− pernitride unit utilizing the electrons transferred from the transition metals. The strong nature of the single dinitrogen bond and transition metal–nitrogen charge transfer induce extraordinary mechanic properties in the predicted transition metal pernitrides including large bulk modulus and high Vickers hardness. Among the predictions the hardness of MnN2 is 36.6 GPa, suggesting that it is potentially a hard material. The results obtained in the present study are important to the understanding of structure–property relationships in transition metal pernitrides and will hopefully encourage future synthesis of these technologically important materials. We identified for the first time the ground-state structures of MnN2, TaN2, NbN2, VN2, ZrN2 and HfN2 pernitrides and proposed their synthesis pressures.![]()
Collapse
Affiliation(s)
- Rongmei Yu
- State Key Laboratory of Superhard Materials
- College of Physics
- Jilin University
- Changchun
- P. R. China
| | - Ermiao Sun
- State Key Laboratory of Superhard Materials
- College of Physics
- Jilin University
- Changchun
- P. R. China
| | - Liguang Jiao
- State Key Laboratory of Superhard Materials
- College of Physics
- Jilin University
- Changchun
- P. R. China
| | - Yongmao Cai
- School of Science
- Northeast Electric Power University
- Jilin
- P. R. China
| | - Hongbo Wang
- State Key Laboratory of Superhard Materials
- College of Physics
- Jilin University
- Changchun
- P. R. China
| | - Yansun Yao
- Department of Physics and Engineering Physics
- University of Saskatchewan
- Saskatoon
- Canada
| |
Collapse
|
7
|
Wang C, Li C, Han J, Yan L, Deng B, Liu X. The pressure-temperature phase diagram of pure Co based on first-principles calculations. Phys Chem Chem Phys 2017; 19:22061-22068. [PMID: 28795179 DOI: 10.1039/c7cp03775a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We optimized the high pressure-temperature phase diagram of pure Co up to the liquidus temperature and 120 GPa, based on thermodynamic properties calculated using first-principles. The Gibbs energy for each phase was evaluated in the framework of a quasiharmonic approximation, with a consideration of the thermal electronic contribution at finite temperatures. Particularly, the liquidus temperature, as a function of pressure, was determined using classical Molecular Dynamics simulations. Our results in this work successfully integrated experimental observations and the previous theoretical predictions. The critical solid phase transitions of ε → γf and ε → β were clarified using the Gibbs energy as a function of pressure and temperature. In addition, the magnetism of β above 70 GPa was verified to be nonmagnetic. The difference between γp and β, which was unclear before, has been illustrated to be associated with the magnetic transformation from the paramagnetic state of the γp phase to the nonmagnetic state of the β phase rather than the structural transformation.
Collapse
Affiliation(s)
- Cuiping Wang
- College of Materials and Fujian Provincial Key Laboratory of Materials Genome, Xiamen University, Xiamen 361005, P. R. China.
| | | | | | | | | | | |
Collapse
|
8
|
Liu Y, Duan D, Tian F, Wang C, Ma Y, Li D, Huang X, Liu B, Cui T. Stability and properties of the Ru–H system at high pressure. Phys Chem Chem Phys 2016; 18:1516-20. [DOI: 10.1039/c5cp06617d] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
The calculated formation enthalpies of RuHn (n = 1–8) with respect to Ru and H at different pressures.
Collapse
Affiliation(s)
- Yunxian Liu
- State Key Laboratory of Superhard Materials
- College of Physics
- Jilin University
- Changchun
- P. R. China
| | - Defang Duan
- State Key Laboratory of Superhard Materials
- College of Physics
- Jilin University
- Changchun
- P. R. China
| | - Fubo Tian
- State Key Laboratory of Superhard Materials
- College of Physics
- Jilin University
- Changchun
- P. R. China
| | - Chao Wang
- State Key Laboratory of Superhard Materials
- College of Physics
- Jilin University
- Changchun
- P. R. China
| | - Yanbin Ma
- State Key Laboratory of Superhard Materials
- College of Physics
- Jilin University
- Changchun
- P. R. China
| | - Da Li
- State Key Laboratory of Superhard Materials
- College of Physics
- Jilin University
- Changchun
- P. R. China
| | - Xiaoli Huang
- State Key Laboratory of Superhard Materials
- College of Physics
- Jilin University
- Changchun
- P. R. China
| | - Bingbing Liu
- State Key Laboratory of Superhard Materials
- College of Physics
- Jilin University
- Changchun
- P. R. China
| | - Tian Cui
- State Key Laboratory of Superhard Materials
- College of Physics
- Jilin University
- Changchun
- P. R. China
| |
Collapse
|