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Bykov M, Bykova E, Aprilis G, Glazyrin K, Koemets E, Chuvashova I, Kupenko I, McCammon C, Mezouar M, Prakapenka V, Liermann HP, Tasnádi F, Ponomareva AV, Abrikosov IA, Dubrovinskaia N, Dubrovinsky L. Fe-N system at high pressure reveals a compound featuring polymeric nitrogen chains. Nat Commun 2018; 9:2756. [PMID: 30013071 PMCID: PMC6048061 DOI: 10.1038/s41467-018-05143-2] [Citation(s) in RCA: 74] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2017] [Accepted: 06/19/2018] [Indexed: 11/21/2022] Open
Abstract
Poly-nitrogen compounds have been considered as potential high energy density materials for a long time due to the large number of energetic N-N or N=N bonds. In most cases high nitrogen content and stability at ambient conditions are mutually exclusive, thereby making the synthesis of such materials challenging. One way to stabilize such compounds is the application of high pressure. Here, through a direct reaction between Fe and N2 in a laser-heated diamond anvil cell, we synthesize three ironnitrogen compounds Fe3N2, FeN2 and FeN4. Their crystal structures are revealed by single-crystal synchrotron X-ray diffraction. Fe3N2, synthesized at 50 GPa, is isostructural to chromium carbide Cr3C2. FeN2 has a marcasite structure type and features covalently bonded dinitrogen units in its crystal structure. FeN4, synthesized at 106 GPa, features polymeric nitrogen chains of [N42-]n units. Based on results of structural studies and theoretical analysis, [N42-]n units in this compound reveal catena-poly[tetraz-1-ene-1,4-diyl] anions.
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Affiliation(s)
- M Bykov
- Bayerisches Geoinstitut, University of Bayreuth, 95440, Bayreuth, Germany.
| | - E Bykova
- Bayerisches Geoinstitut, University of Bayreuth, 95440, Bayreuth, Germany
- Photon Science, Deutsches Elektronen-Synchrotron, Notkestrasse 85, 22607, Hamburg, Germany
| | - G Aprilis
- Material Physics and Technology at Extreme Conditions, Laboratory of Crystallography, University of Bayreuth, 95440, Bayreuth, Germany
| | - K Glazyrin
- Photon Science, Deutsches Elektronen-Synchrotron, Notkestrasse 85, 22607, Hamburg, Germany
| | - E Koemets
- Bayerisches Geoinstitut, University of Bayreuth, 95440, Bayreuth, Germany
| | - I Chuvashova
- Bayerisches Geoinstitut, University of Bayreuth, 95440, Bayreuth, Germany
- Material Physics and Technology at Extreme Conditions, Laboratory of Crystallography, University of Bayreuth, 95440, Bayreuth, Germany
| | - I Kupenko
- Institut für Mineralogie, University of Münster, Corrensstraße 24, 48149, Münster, Germany
| | - C McCammon
- Bayerisches Geoinstitut, University of Bayreuth, 95440, Bayreuth, Germany
| | - M Mezouar
- European Synchrotron Radiation Facility, BP 220, 38043, Grenoble Cedex, France
| | - V Prakapenka
- Center for Advanced Radiation Sources, University of Chicago, 9700 South Cass Avenue, Argonne, IL, 60437, USA
| | - H-P Liermann
- Photon Science, Deutsches Elektronen-Synchrotron, Notkestrasse 85, 22607, Hamburg, Germany
| | - F Tasnádi
- Department of Physics, Chemistry and Biology (IFM), Linköping University, SE-58183, Linköping, Sweden
- Materials Modeling and Development Laboratory, National University of Science and Technology 'MISIS', Moscow, 119049, Russia
| | - A V Ponomareva
- Materials Modeling and Development Laboratory, National University of Science and Technology 'MISIS', Moscow, 119049, Russia
| | - I A Abrikosov
- Department of Physics, Chemistry and Biology (IFM), Linköping University, SE-58183, Linköping, Sweden
| | - N Dubrovinskaia
- Material Physics and Technology at Extreme Conditions, Laboratory of Crystallography, University of Bayreuth, 95440, Bayreuth, Germany
| | - L Dubrovinsky
- Bayerisches Geoinstitut, University of Bayreuth, 95440, Bayreuth, Germany
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Ektarawong A, Simak SI, Hultman L, Birch J, Tasnádi F, Wang F, Alling B. Effects of configurational disorder on the elastic properties of icosahedral boron-rich alloys based on B6O, B13C2, and B4C, and their mixing thermodynamics. J Chem Phys 2016; 144:134503. [PMID: 27059576 DOI: 10.1063/1.4944982] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The elastic properties of alloys between boron suboxide (B6O) and boron carbide (B13C2), denoted by (B6O)(1-x)(B13C2)(x), as well as boron carbide with variable carbon content, ranging from B13C2 to B4C are calculated from first-principles. Furthermore, the mixing thermodynamics of (B6O)(1-x)(B13C2)(x) is studied. A superatom-special quasirandom structure approach is used for modeling different atomic configurations, in which effects of configurational disorder between the carbide and suboxide structural units, as well as between boron and carbon atoms within the units, are taken into account. Elastic properties calculations demonstrate that configurational disorder in B13C2, where a part of the C atoms in the CBC chains substitute for B atoms in the B12 icosahedra, drastically increase the Young's and shear modulus, as compared to an atomically ordered state, B12(CBC). These calculated elastic moduli of the disordered state are in excellent agreement with experiments. Configurational disorder between boron and carbon can also explain the experimentally observed almost constant elastic moduli of boron carbide as the carbon content is changed from B4C to B13C2. The elastic moduli of the (B6O)(1-x)(B13C2)(x) system are also practically unchanged with composition if boron-carbon disorder is taken into account. By investigating the mixing thermodynamics of the alloys, in which the Gibbs free energy is determined within the mean-field approximation for the configurational entropy, we outline the pseudo-binary phase diagram of (B6O)(1-x)(B13C2)(x). The phase diagram reveals the existence of a miscibility gap at all temperatures up to the melting point. Also, the coexistence of B6O-rich as well as ordered or disordered B13C2-rich domains in the material prepared through equilibrium routes is predicted.
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Affiliation(s)
- A Ektarawong
- Thin Film Physics Division, Department of Physics, Chemistry and Biology (IFM), Linköping University, SE-581 83 Linköping, Sweden
| | - S I Simak
- Theoretical Physics Division, Department of Physics, Chemistry and Biology (IFM), Linköping University, SE-581 83 Linköping, Sweden
| | - L Hultman
- Thin Film Physics Division, Department of Physics, Chemistry and Biology (IFM), Linköping University, SE-581 83 Linköping, Sweden
| | - J Birch
- Thin Film Physics Division, Department of Physics, Chemistry and Biology (IFM), Linköping University, SE-581 83 Linköping, Sweden
| | - F Tasnádi
- Theoretical Physics Division, Department of Physics, Chemistry and Biology (IFM), Linköping University, SE-581 83 Linköping, Sweden
| | - F Wang
- Theoretical Physics Division, Department of Physics, Chemistry and Biology (IFM), Linköping University, SE-581 83 Linköping, Sweden
| | - B Alling
- Thin Film Physics Division, Department of Physics, Chemistry and Biology (IFM), Linköping University, SE-581 83 Linköping, Sweden
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Glazyrin K, Pourovskii LV, Dubrovinsky L, Narygina O, McCammon C, Hewener B, Schünemann V, Wolny J, Muffler K, Chumakov AI, Crichton W, Hanfland M, Prakapenka VB, Tasnádi F, Ekholm M, Aichhorn M, Vildosola V, Ruban AV, Katsnelson MI, Abrikosov IA. Importance of correlation effects in hcp iron revealed by a pressure-induced electronic topological transition. Phys Rev Lett 2013; 110:117206. [PMID: 25166573 DOI: 10.1103/physrevlett.110.117206] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/16/2012] [Indexed: 06/03/2023]
Abstract
We discover that hcp phases of Fe and Fe(0.9)Ni(0.1) undergo an electronic topological transition at pressures of about 40 GPa. This topological change of the Fermi surface manifests itself through anomalous behavior of the Debye sound velocity, c/a lattice parameter ratio, and Mössbauer center shift observed in our experiments. First-principles simulations within the dynamic mean field approach demonstrate that the transition is induced by many-electron effects. It is absent in one-electron calculations and represents a clear signature of correlation effects in hcp Fe.
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Affiliation(s)
- K Glazyrin
- Bayerisches Geoinstitut, Universität Bayreuth, 95440 Bayreuth, Germany and Yale University, New Haven, Connecticut 06511, USA
| | - L V Pourovskii
- Swedish e-Science Research Centre (SeRC), Department of Physics, Chemistry and Biology (IFM), Linköping University, SE-581 83 Linköping, Sweden and Centre de Physique Théorique, Ecole Polytechnique, CNRS, 91128 Palaiseau Cedex, France
| | - L Dubrovinsky
- Bayerisches Geoinstitut, Universität Bayreuth, 95440 Bayreuth, Germany
| | - O Narygina
- School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom
| | - C McCammon
- Bayerisches Geoinstitut, Universität Bayreuth, 95440 Bayreuth, Germany
| | - B Hewener
- Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany
| | - V Schünemann
- Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany
| | - J Wolny
- Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany
| | - K Muffler
- Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany
| | - A I Chumakov
- European Synchrotron Radiation Facility (ESRF), F-38043 Grenoble Cedex, France
| | - W Crichton
- European Synchrotron Radiation Facility (ESRF), F-38043 Grenoble Cedex, France
| | - M Hanfland
- European Synchrotron Radiation Facility (ESRF), F-38043 Grenoble Cedex, France
| | - V B Prakapenka
- Center for Advanced Radiation Sources, University of Chicago, Chicago, Illinois 60637, USA
| | - F Tasnádi
- Department of Physics, Chemistry and Biology (IFM), Linköping University, Linköping, Sweden
| | - M Ekholm
- Swedish e-Science Research Centre (SeRC), Department of Physics, Chemistry and Biology (IFM), Linköping University, SE-581 83 Linköping, Sweden
| | - M Aichhorn
- Institute of Theoretical and Computational Physics, TU Graz, 8010 Graz, Austria
| | - V Vildosola
- Centro Atómico Constituyentes, GIyANN, CNEA, San Martin, Buenos Aires, Comisión Nacional de Investigaciones Científicas y Técnicas, Ciudad de Buenos Aires, Argentina
| | - A V Ruban
- Department of Materials Science and Engineering, Royal Institute of Technology, SE-10044, Stockholm, Sweden
| | - M I Katsnelson
- Radboud University Nijmegen, Institute for Molecules and Materials, 6525 AJ, Nijmegen, Netherlands
| | - I A Abrikosov
- Department of Physics, Chemistry and Biology (IFM), Linköping University, Linköping, Sweden
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Tasnádi F, Nagy Á. Local self-interaction-free approximate exchange-correlation potentials in the variational density functional theory for individual excited states. Chem Phys Lett 2002. [DOI: 10.1016/s0009-2614(02)01612-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Fonó R, Tasnádi F. [Ventricular septal defect (analysis of 190 cases in infants)]. Orv Hetil 1969; 110:2380-3. [PMID: 5360555] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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