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Zhang J, Chen G, Liu H. Stable Structures and Superconductivity in a Y-Si System under High Pressure. J Phys Chem Lett 2021; 12:10388-10393. [PMID: 34669413 DOI: 10.1021/acs.jpclett.1c02853] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Recently, the discovery of superconductivity in compressed electrides offers a promising route toward searching for high superconductivity in a high-pressure community. However, only a few superconducting electrides have been successfully found thus far, thereby limiting the variety of superconducting electride examples. In this work, we performed extensive structure searches on a high-pressure Y-Si system by using CALYPSO structure prediction methodology. Our simulations identified several stable stoichiometries of YSi, YSi2, YSi3, Y5Si3, Y2Si, and Y3Si under high pressure. These structures contain a diversity of structure configurations, including silicon chains, Si3 trilaterals, Si4 quadrilaterals, Si6 hexagons, Si8 rings, a Si4-Si6-Si8 frame, as well as a silicon layer. Remarkably, Y3Si is predicted to be an electride with a superconducting critical temperature (Tc) of ∼11.2 and 14.5 K at 30 and 50 GPa, respectively. These results highlight the role of the electrons at the Fermi surface in determining the superconductivity of predicted structures.
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Affiliation(s)
- Jurong Zhang
- Shandong Provincial Engineering and Technical Center of Light Manipulations & Shandong Provincial Key Laboratory of Optics and Photonic Device, School of Physics and Electronics, Shandong Normal University, Jinan 250358, China
| | - Gang Chen
- Shandong Provincial Engineering and Technical Center of Light Manipulations & Shandong Provincial Key Laboratory of Optics and Photonic Device, School of Physics and Electronics, Shandong Normal University, Jinan 250358, China
| | - Hanyu Liu
- State Key Laboratory of Superhard Materials and International Center for Computational Method & Software, College of Physics, Jilin University, Changchun 130012, China
- International Center of Future Science, Jilin University, Changchun 130012, China
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Nentwich M, Zschornak M, Sonntag M, Gumeniuk R, Gemming S, Leisegang T, Meyer DC. Structure variations within RSi 2 and R 2Si 3 silicides. Part II. Structure driving factors. ACTA CRYSTALLOGRAPHICA SECTION B, STRUCTURAL SCIENCE, CRYSTAL ENGINEERING AND MATERIALS 2020; 76:378-410. [PMID: 32831258 PMCID: PMC7278089 DOI: 10.1107/s2052520620003893] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/23/2019] [Accepted: 03/16/2020] [Indexed: 06/11/2023]
Abstract
To gain an overview of the various structure reports on RSi2 and R2TSi3 compounds (R is a member of the Sc group, an alkaline earth, lanthanide or actinide metal, T is a transition metal), compositions, lattice parameters a and c, ratios c/a, formula units per unit cell, and structure types are summarized in extensive tables and the variations of these properties when varying the R or T elements are analyzed. Following the structural systematization given in Part I, Part II focuses on revealing the driving factors for certain structure types, in particular, the electronic structure. Here, concepts of different complexity are presented, including molecular orbital theory, the principle of hard and soft acids and bases, and a Bader analysis based on Density Functional Theory calculations for representatives of the reported structure types. The potential Si/T ordering in different structures is discussed. Additionally, the influences from intrinsic and extrinsic properties (e.g. elemental size and electronics as well as lattice parameters and structure type) are investigated on each other using correlation plots. Thermal treatment is identified as an important factor for the ordering of Si/T atoms.
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Affiliation(s)
- M. Nentwich
- Institute for Experimental Physics,Technical University Bergakademie Freiberg, 09596 Freiberg, Germany
| | - M. Zschornak
- Institute for Experimental Physics,Technical University Bergakademie Freiberg, 09596 Freiberg, Germany
| | - M. Sonntag
- Institute for Experimental Physics,Technical University Bergakademie Freiberg, 09596 Freiberg, Germany
| | - R. Gumeniuk
- Institute for Experimental Physics,Technical University Bergakademie Freiberg, 09596 Freiberg, Germany
| | - S. Gemming
- Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany
- Institute of Physics, Technische Universität Chemnitz, 09107 Chemnitz, Germany
| | - T. Leisegang
- Institute for Experimental Physics,Technical University Bergakademie Freiberg, 09596 Freiberg, Germany
- Samara Center for Theoretical Materials Science, Samara State Technical University, Samara, Russia
| | - D. C. Meyer
- Institute for Experimental Physics,Technical University Bergakademie Freiberg, 09596 Freiberg, Germany
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Nentwich M, Zschornak M, Sonntag M, Gumeniuk R, Gemming S, Leisegang T, Meyer DC. Structure variations within RSi 2 and R 2TSi 3 silicides. Part I. Structure overview. ACTA CRYSTALLOGRAPHICA SECTION B, STRUCTURAL SCIENCE, CRYSTAL ENGINEERING AND MATERIALS 2020; 76:177-200. [PMID: 32831221 PMCID: PMC7137784 DOI: 10.1107/s2052520620001043] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/19/2019] [Accepted: 01/26/2020] [Indexed: 06/11/2023]
Abstract
Here, structural parameters of various structure reports on RSi2 and R2TSi3 compounds [where R is an alkaline earth metal, a rare earth metal (i.e. an element of the Sc group or a lathanide), or an actinide and T is a transition metal] are summarized. The parameters comprising composition, lattice parameters a and c, ratio c/a, formula unit per unit cell and structure type are tabulated. The relationships between the underlying structure types are presented within a group-subgroup scheme (Bärnighausen diagram). Additionally, unexpectedly missing compounds within the R2TSi3 compounds were examined with density functional theory and compounds that are promising candidates for synthesis are listed. Furthermore, a correlation was detected between the orthorhombic AlB2-like lattices of, for example, Ca2AgSi3 and the divalence of R and the monovalence of T. Finally, a potential tetragonal structure with ordered Si/T sites is proposed.
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Affiliation(s)
- M. Nentwich
- Institute for Experimental Physics, Technical University Bergakademie Freiberg, 09596 Freiberg, Germany
| | - M. Zschornak
- Institute for Experimental Physics, Technical University Bergakademie Freiberg, 09596 Freiberg, Germany
| | - M. Sonntag
- Institute for Experimental Physics, Technical University Bergakademie Freiberg, 09596 Freiberg, Germany
| | - R. Gumeniuk
- Institute for Experimental Physics, Technical University Bergakademie Freiberg, 09596 Freiberg, Germany
| | - S. Gemming
- Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany
- Institute of Physics, Technische Universität Chemnitz, 09107 Chemnitz, Germany
| | - T. Leisegang
- Institute for Experimental Physics, Technical University Bergakademie Freiberg, 09596 Freiberg, Germany
- Samara Center for Theoretical Materials Science, Samara National Research University, 443086 Samara, Russia
| | - D. C. Meyer
- Institute for Experimental Physics, Technical University Bergakademie Freiberg, 09596 Freiberg, Germany
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Xu K, Zou H, Chang K, Deng Z, Zhou X, Huang Y, Chen L, Huang F, Huang Q. Thermodynamic description of the sintering aid system in silicon carbide ceramics with the addition of yttrium. Ann Ital Chir 2019. [DOI: 10.1016/j.jeurceramsoc.2019.07.012] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Rare-earth metal gallium silicides via the gallium self-flux method. Synthesis, crystal structures, and magnetic properties of RE(Ga1−xSix)2 (RE=Y, La–Nd, Sm, Gd–Yb, Lu). J SOLID STATE CHEM 2013. [DOI: 10.1016/j.jssc.2013.02.029] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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JIANG W, ZHAN Y, LI C, LIU S, ZHOU H, ZHUANG Y. Phase equilibria in Nb-Y-Si ternary system at 873 K. J RARE EARTH 2012. [DOI: 10.1016/s1002-0721(12)60157-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Peter SC, Kanatzidis MG. ThSi2 Type Ytterbium Disilicide and its Analogues YbTxSi2-x (T = Cr, Fe, Co). Z Anorg Allg Chem 2012. [DOI: 10.1002/zaac.201100284] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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A. Papoian G, Hoffmann R. Hypervalenzbindung in einer, zwei und drei Dimensionen: Erweiterung des Zintl-Klemm-Konzepts auf nichtklassische elektronenreiche Netze. Angew Chem Int Ed Engl 2000. [DOI: 10.1002/1521-3757(20000717)112:14<2500::aid-ange2500>3.0.co;2-t] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Schobinger-Papamantellos P, Buschow K. Crystallographic and magnetic structure of Tb3Ge5. ACTA ACUST UNITED AC 1989. [DOI: 10.1016/0022-5088(89)90386-x] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Iandelli A, Palenzona A, Olcese G. Valence fluctuations of ytterbium in silicon-rich compounds. ACTA ACUST UNITED AC 1979. [DOI: 10.1016/0022-5088(79)90172-3] [Citation(s) in RCA: 120] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Gladyshevskii EI, Kripyakevich PI. Monosilicides of rare earth metals and their crystal structures. J STRUCT CHEM+ 1965. [DOI: 10.1007/bf00744231] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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