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Abstract
The polymerization of nitrogen can be used as high energy density materials. The crystal structures of Li2N2 at high pressures are explored by using the first-principles method combined with evolutionary algorithm. The phase transitions Pmmm → Immm → Pnma → Cmcm-1 → I41/acd are predicted in the pressure range of 0–300 GPa. Enthalpy calculations reveal that the tetragonal phase I41/acd containing the spiral nitrogen chains is stable above 242 GPa, indicating that the polymerization of nitrogen is realized in Li2N2 under pressure.
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Tsuji Y, Dasari PLVK, Elatresh SF, Hoffmann R, Ashcroft NW. Structural Diversity and Electron Confinement in Li4N: Potential for 0-D, 2-D, and 3-D Electrides. J Am Chem Soc 2016; 138:14108-14120. [DOI: 10.1021/jacs.6b09067] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Yuta Tsuji
- Education
Center for Global Leaders in Molecular Systems for Devices, Kyushu University, Nishi-ku, Fukuoka 819-0395, Japan
| | | | - S. F. Elatresh
- Department
of Chemistry and Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853, United States
| | - Roald Hoffmann
- Department
of Chemistry and Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853, United States
| | - N. W. Ashcroft
- Laboratory
of Atomic and Solid State Physics, Cornell University, Ithaca, New York 14853, United States
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Shen Y, Oganov AR, Qian G, Zhang J, Dong H, Zhu Q, Zhou Z. Novel lithium-nitrogen compounds at ambient and high pressures. Sci Rep 2015; 5:14204. [PMID: 26374272 PMCID: PMC4570992 DOI: 10.1038/srep14204] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2015] [Accepted: 08/20/2015] [Indexed: 11/09/2022] Open
Abstract
Using ab initio evolutionary simulations, we predict the existence of five novel stable Li-N compounds at pressures from 0 to 100 GPa (Li13N, Li5N, Li3N2, LiN2, and LiN5). Structures of these compounds contain isolated N atoms, N2 dimers, polyacetylene-like N chains and N5 rings, respectively. The structure of Li13N consists of Li atoms and Li12N icosahedra (with N atom in the center of the Li12 icosahedron) – such icosahedra are not described by Wade-Jemmis electron counting rules and are unique. Electronic structure of Li-N compounds is found to dramatically depend on composition and pressure, making this system ideal for studying metal-insulator transitions. For example, the sequence of lowest-enthalpy structures of LiN3 shows peculiar electronic structure changes with increasing pressure: metal-insulator-metal-insulator. This work also resolves the previous controversies of theory and experiment on Li2N2.
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Affiliation(s)
- Yanqing Shen
- Department of Physics, Harbin Institute of Technology, Harbin 150001, China.,Department of Geosciences, Center for Materials by Design, and Institute for Advanced Computational Science, Stony Brook University, Stony Brook, New York 11794, USA
| | - Artem R Oganov
- Skolkovo Institute of Science and Technology, Skolkovo Innovation Center, 3 Nobel St., Moscow 143026, Russia.,Moscow Institute of Physics and Technology, 9 Institutskiy Lane, Dolgoprudny City, Moscow Region 141700, Russia.,Department of Geosciences, Center for Materials by Design, and Institute for Advanced Computational Science, Stony Brook University, Stony Brook, New York 11794, USA.,School of Materials Science, Northwestern Polytechnical University, Xi'an 710072, China
| | - Guangri Qian
- Department of Geosciences, Center for Materials by Design, and Institute for Advanced Computational Science, Stony Brook University, Stony Brook, New York 11794, USA
| | - Jin Zhang
- Department of Geosciences, Center for Materials by Design, and Institute for Advanced Computational Science, Stony Brook University, Stony Brook, New York 11794, USA
| | - Huafeng Dong
- Department of Geosciences, Center for Materials by Design, and Institute for Advanced Computational Science, Stony Brook University, Stony Brook, New York 11794, USA
| | - Qiang Zhu
- Department of Geosciences, Center for Materials by Design, and Institute for Advanced Computational Science, Stony Brook University, Stony Brook, New York 11794, USA
| | - Zhongxiang Zhou
- Department of Physics, Harbin Institute of Technology, Harbin 150001, China
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Nicholls RJ, Ni N, Lozano-Perez S, London A, McComb DW, Nellist PD, Grovenor CRM, Pickard CJ, Yates JR. Crystal Structure of the ZrO Phase at Zirconium/Zirconium Oxide Interfaces. ADVANCED ENGINEERING MATERIALS 2015; 17:211-215. [PMID: 25892957 PMCID: PMC4393322 DOI: 10.1002/adem.201400133] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/17/2014] [Accepted: 05/29/2014] [Indexed: 06/04/2023]
Abstract
Zirconium-based alloys are used in water-cooled nuclear reactors for both nuclear fuel cladding and structural components. Under this harsh environment, the main factor limiting the service life of zirconium cladding, and hence fuel burn-up efficiency, is water corrosion. This oxidation process has recently been linked to the presence of a sub-oxide phase with well-defined composition but unknown structure at the metal-oxide interface. In this paper, the combination of first-principles materials modeling and high-resolution electron microscopy is used to identify the structure of this sub-oxide phase, bringing us a step closer to developing strategies to mitigate aqueous oxidation in Zr alloys and prolong the operational lifetime of commercial fuel cladding alloys.
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Affiliation(s)
- Rebecca J Nicholls
- [*] Dr. R. J. Nicholls, Department of Materials, University of
Oxford, Parks Road, Oxford OX1 3PH, UK E-mail:
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Schneider SB, Seibald M, Deringer VL, Stoffel RP, Frankovsky R, Friederichs GM, Laqua H, Duppel V, Jeschke G, Dronskowski R, Schnick W. High-Pressure Synthesis and Characterization of Li2Ca3[N2]3—An Uncommon Metallic Diazenide with [N2]2– Ions. J Am Chem Soc 2013; 135:16668-79. [DOI: 10.1021/ja408816t] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Sebastian B. Schneider
- Department
of Chemistry, Chair for Solid-State Chemistry, Ludwig Maximilian University, Butenandtstrasse 5-13, Munich 81377, Germany
| | - Markus Seibald
- Department
of Chemistry, Chair for Solid-State Chemistry, Ludwig Maximilian University, Butenandtstrasse 5-13, Munich 81377, Germany
| | | | | | - Rainer Frankovsky
- Department
of Chemistry, Chair for Solid-State Chemistry, Ludwig Maximilian University, Butenandtstrasse 5-13, Munich 81377, Germany
| | - Gina M. Friederichs
- Department
of Chemistry, Chair for Solid-State Chemistry, Ludwig Maximilian University, Butenandtstrasse 5-13, Munich 81377, Germany
| | - Henryk Laqua
- Laboratory
for Physical Chemistry, ETH Zürich, Wolfgang-Pauli-Strasse 10, Zürich 8093, Switzerland
| | - Viola Duppel
- Max Planck Institute for Solid State Research Stuttgart, Heisenbergstrasse 1, Stuttgart 70569, Germany
| | - Gunnar Jeschke
- Laboratory
for Physical Chemistry, ETH Zürich, Wolfgang-Pauli-Strasse 10, Zürich 8093, Switzerland
| | | | - Wolfgang Schnick
- Department
of Chemistry, Chair for Solid-State Chemistry, Ludwig Maximilian University, Butenandtstrasse 5-13, Munich 81377, Germany
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Schneider SB, Frankovsky R, Schnick W. High-Pressure Synthesis and Characterization of the Alkali Diazenide Li2N2. Angew Chem Int Ed Engl 2012; 51:1873-5. [DOI: 10.1002/anie.201108252] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2011] [Indexed: 11/06/2022]
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