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Braun T, Hlukhyy V. CaFe2Ge2 with square-planar iron layers – Closing a gap in the row of CaT2Ge2 (T = Mn–Zn). J SOLID STATE CHEM 2019. [DOI: 10.1016/j.jssc.2019.05.032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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2
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Wu J, Lu E, Li J, Lu Y, Kitano M, Fredrickson DC, Inoshita T, Hosono H. Pseudogap Control of Physical and Chemical Properties in CeFeSi-Type Intermetallics. Inorg Chem 2019; 58:2848-2855. [PMID: 30729788 DOI: 10.1021/acs.inorgchem.8b03539] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We describe the synthesis of the new ternary compound CaRuSi whose chemical and physical properties help draw a clear picture of how electronic structure controls the behavior of an isostructural series of intermetallics. DFT calculations reveal that an electronic pseudogap arises near the Fermi level ( EF), corresponding to 14 valence electrons per RuSi unit. The closed-shell-like character is further investigated by comparisons with the electronic structures of CaCoSi (15 electrons), where the EF lies above the corresponding pseudogap, and its hydride CaCoSiH, where formation of H anions restores the 14-electron count on the metal sublattice, returning the EF to the pseudogap. The chemical origin of the 14-electron pseudogap is interpreted with a reversed approximation Molecular Orbital analysis. Here, the pseudogap is shown to coincide with the filling of Ru 16 electron configurations isolobal to the d8 square planar complexes of coordination chemistry (but where 4 electron pairs are shared covalently between Ru atoms such that only 12 electrons are required), and the occupation of Si lone pairs (2 electrons). Experimentally, the pseudogap is confirmed with heat capacity measurements, which indicate that the 14-electron systems CaRuSi and CaCoSiH each exhibit a smaller electronic density of states at the EF than the 15-electron system CaCoSi. Importantly, the 14-electron pseudogap also significantly affects the chemical properties of the compounds, as evidenced by the difference in the stabilities of CaCoSiH and CaRuSiH observed in hydrogen desorption measurements. These results may support the design of functional materials for superconductivity, hydrogen storage, and catalysis involving hydrogenation.
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Affiliation(s)
- Jiazhen Wu
- Materials Research Center for Element Strategy , Tokyo Institute of Technology , 4259 Nagatsuta, Midori-ku , Yokohama 226-8503 , Japan
| | - Erdong Lu
- Department of Chemistry , University of Wisconsin-Madison , 1101 University Avenue , Madison , Wisconsin 57306 , United States
| | - Jiang Li
- Materials Research Center for Element Strategy , Tokyo Institute of Technology , 4259 Nagatsuta, Midori-ku , Yokohama 226-8503 , Japan
| | - Yangfan Lu
- Materials Research Center for Element Strategy , Tokyo Institute of Technology , 4259 Nagatsuta, Midori-ku , Yokohama 226-8503 , Japan
| | - Masaaki Kitano
- Materials Research Center for Element Strategy , Tokyo Institute of Technology , 4259 Nagatsuta, Midori-ku , Yokohama 226-8503 , Japan
| | - Daniel C Fredrickson
- Materials Research Center for Element Strategy , Tokyo Institute of Technology , 4259 Nagatsuta, Midori-ku , Yokohama 226-8503 , Japan.,Department of Chemistry , University of Wisconsin-Madison , 1101 University Avenue , Madison , Wisconsin 57306 , United States
| | - Takeshi Inoshita
- Materials Research Center for Element Strategy , Tokyo Institute of Technology , 4259 Nagatsuta, Midori-ku , Yokohama 226-8503 , Japan.,National Institute for Materials Science , Tsukuba , Ibaraki 305-0044 , Japan
| | - Hideo Hosono
- Materials Research Center for Element Strategy , Tokyo Institute of Technology , 4259 Nagatsuta, Midori-ku , Yokohama 226-8503 , Japan.,Laboratory for Materials and Structures, Institute of Innovative Research , Tokyo Institute of Technology , 4259 Nagatsuta, Midori-ku , Yokohama 226-8503 , Japan
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3
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Braun T, Zeitz S, Hlukhyy V. SrNi 2
Si and BaNi 2
Si - New Layered Silicides with Fused Nickel Six-membered Rings in a Boat Conformation. Z Anorg Allg Chem 2019. [DOI: 10.1002/zaac.201800500] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Thomas Braun
- Department of Chemistry; Technische Universität München; Lichtenbergstr. 4 85747 Garching Germany
| | - Sabine Zeitz
- Department of Chemistry; Technische Universität München; Lichtenbergstr. 4 85747 Garching Germany
| | - Viktor Hlukhyy
- Department of Chemistry; Technische Universität München; Lichtenbergstr. 4 85747 Garching Germany
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4
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Li F, Wei W, Lv X, Huang B, Dai Y. Evolution of the linear band dispersion of monolayer and bilayer germanene on Cu(111). Phys Chem Chem Phys 2017; 19:22844-22851. [DOI: 10.1039/c7cp03597g] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The bottom germanene layer plays a role as a buffer layer preserving the electronic properties of the upper germanene layer.
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Affiliation(s)
- Fengping Li
- School of Physics
- State Key Laboratory of Crystal Materials
- Shandong University
- Jinan 250100
- China
| | - Wei Wei
- School of Physics
- State Key Laboratory of Crystal Materials
- Shandong University
- Jinan 250100
- China
| | - Xingshuai Lv
- School of Physics
- State Key Laboratory of Crystal Materials
- Shandong University
- Jinan 250100
- China
| | - Baibiao Huang
- School of Physics
- State Key Laboratory of Crystal Materials
- Shandong University
- Jinan 250100
- China
| | - Ying Dai
- School of Physics
- State Key Laboratory of Crystal Materials
- Shandong University
- Jinan 250100
- China
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Derivaz M, Dentel D, Stephan R, Hanf MC, Mehdaoui A, Sonnet P, Pirri C. Continuous germanene layer on Al(111). NANO LETTERS 2015; 15:2510-6. [PMID: 25802988 DOI: 10.1021/acs.nanolett.5b00085] [Citation(s) in RCA: 182] [Impact Index Per Article: 20.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
Germanene, a 2D honeycomb structure similar to silicene, has been fabricated on Al(111). The 2D germanene layer covers uniformly the substrate with a large coherence over the Al(111) surface atomic plane. It is characterized by a (3 × 3) superstructure with respect to the substrate lattice, shown by low energy electron diffraction and scanning tunnelling microscopy. First-principles calculations indicate that the Ge atoms accommodate in a very regular atomic configuration with a buckled conformation.
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Affiliation(s)
- Mickael Derivaz
- Institut de Science des Matériaux de Mulhouse IS2M UMR 7361 CNRS-Université de Haute Alsace, 3 bis rue Alfred Werner, 68057 Mulhouse, France
| | - Didier Dentel
- Institut de Science des Matériaux de Mulhouse IS2M UMR 7361 CNRS-Université de Haute Alsace, 3 bis rue Alfred Werner, 68057 Mulhouse, France
| | - Régis Stephan
- Institut de Science des Matériaux de Mulhouse IS2M UMR 7361 CNRS-Université de Haute Alsace, 3 bis rue Alfred Werner, 68057 Mulhouse, France
| | - Marie-Christine Hanf
- Institut de Science des Matériaux de Mulhouse IS2M UMR 7361 CNRS-Université de Haute Alsace, 3 bis rue Alfred Werner, 68057 Mulhouse, France
| | - Ahmed Mehdaoui
- Institut de Science des Matériaux de Mulhouse IS2M UMR 7361 CNRS-Université de Haute Alsace, 3 bis rue Alfred Werner, 68057 Mulhouse, France
| | - Philippe Sonnet
- Institut de Science des Matériaux de Mulhouse IS2M UMR 7361 CNRS-Université de Haute Alsace, 3 bis rue Alfred Werner, 68057 Mulhouse, France
| | - Carmelo Pirri
- Institut de Science des Matériaux de Mulhouse IS2M UMR 7361 CNRS-Université de Haute Alsace, 3 bis rue Alfred Werner, 68057 Mulhouse, France
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Crystal Structure of Mg 0.39(2)NiSn 1.61(2)and Mg 2.61(2)Ni 4Sn 3.39(2)Featuring Mg/Sn Atom Networks with Different Connections of Ni@(Mg/Sn) 8Coordination Polyhedra. Z Anorg Allg Chem 2015. [DOI: 10.1002/zaac.201400546] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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7
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Hoffmann AV, Hlukhyy V, Fässler TF. Synthesis, Structure, and Chemical Bonding in CaCoSi. Z Anorg Allg Chem 2014. [DOI: 10.1002/zaac.201400356] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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8
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Hlukhyy V, Hoffmann AV, Fässler TF. Synthesis, structure and chemical bonding of CaFe2−xRhxSi2 (x=0, 1.32, and 2) and SrCo2Si2. J SOLID STATE CHEM 2013. [DOI: 10.1016/j.jssc.2013.04.033] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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9
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Hlukhyy V, Siggelkow L, Fässler TF. From one to three dimensions: corrugated ∞(1)[NiGe] ribbons as a building block in alkaline earth metal Ae/Ni/Ge phases with crystal structure and chemical bonding in AeNiGe (Ae = Mg, Sr, Ba). Inorg Chem 2013; 52:6905-15. [PMID: 23741964 DOI: 10.1021/ic302681t] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The new equiatomic nickel germanides MgNiGe, SrNiGe, and BaNiGe have been synthesized from the elements in sealed tantalum tubes using a high-frequency furnace. The compounds were investigated by X-ray diffraction both on powders and single crystals. MgNiGe crystallizes with TiNiSi-type structure, space group Pnma, Z = 4, a = 6.4742(2) Å, b = 4.0716(1) Å, c = 6.9426(2) Å, wR2 = 0.033, 305 F(2) values, 20 variable parameters. SrNiGe and BaNiGe are isotypic and crystallize with anti-SnFCl-type structure (Z = 4, Pnma) with a = 5.727(1) Å, b = 4.174(1) Å, c = 11.400(3) Å, wR2 = 0.078, 354 F(2) values, 20 variable parameters for SrNiGe, and a = 5.969(4) Å, b = 4.195(1) Å, c = 11.993(5) Å, wR2 = 0.048, 393 F(2) values, 20 variable parameters for BaNiGe. The increase of the cation size leads to a reduction of the dimensionality of the [NiGe] polyanions. In the MgNiGe structure the nickel and germanium atoms build a ∞(3)[NiGe] network with magnesium atoms in the channels. In SrNiGe and BaNiGe the ∞(1)[NiGe] ribbons are separated by strontium/barium atoms, whereas in the known CaNiGe structure the ribbons are fused to two-dimmensional atom slabs. The crystal chemistry and chemical bonding in AeNiGe (Ae = Mg, Ca, Sr, Ba) are discussed. The experimental results are reconciled with electronic structure calculations performed using the tight-binding linear muffin-tin orbital (TB-LMTO-ASA) method.
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Affiliation(s)
- Viktor Hlukhyy
- Department of Chemistry, Technische Universität München, Lichtenbergstr. 4, 85747 Garching, Germany
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Liu X, Matsuishi S, Fujitsu S, Ishigaki T, Kamiyama T, Hosono H. Layered Hydride CaNiGeH with a ZrCuSiAs-type Structure: Crystal Structure, Chemical Bonding, and Magnetism Induced by Mn Doping. J Am Chem Soc 2012; 134:11687-94. [DOI: 10.1021/ja3026104] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | | | | | - Toru Ishigaki
- Frontier
Research Center for Applied
Sciences, Ibaraki University, 162-1, Shirakata,
Tokai, Naka, Ibaraki 319-1106, Japan
| | - Takashi Kamiyama
- High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki, 305-0801,
Japan
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Hlukhyy V, Siggelkow L, Fässler TF. Ca5Ni17Ge8- A Complex Intermetallic Compound Combining Various Structure Motifs of Alkaline-Earth Nickel Germanides. Z Anorg Allg Chem 2012. [DOI: 10.1002/zaac.201200118] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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12
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Siggelkow L, Hlukhyy V, Fässler TF. Synthesis, Structure and Chemical Bonding of Ba2Ni5Ge4 - An Intermetallic Compound with a New Two-dimensional $\rm^2_\infty$[Ni5Ge4] Structural Motif. Z Anorg Allg Chem 2011. [DOI: 10.1002/zaac.201100306] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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13
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Siggelkow L, Hlukhyy V, Wahl B, Fässler TF. Complex Intermetallic Compounds: CaNi
5
Ge
3
, Ca
15
Ni
68
Ge
37
, and Ca
7
Ni
49
Ge
22
– Three Multifaceted Ni‐Ge Framework Structures Combining the Structural Motifs of Ni
3
Ge and CaNi
2
Ge
2. Eur J Inorg Chem 2011. [DOI: 10.1002/ejic.201100347] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Lisa Siggelkow
- Department Chemie, Technische Universität München, Lichtenbergstr. 4, 85747 Garching, Germany
| | - Viktor Hlukhyy
- Department Chemie, Technische Universität München, Lichtenbergstr. 4, 85747 Garching, Germany
| | - Bernhard Wahl
- Department Chemie, Technische Universität München, Lichtenbergstr. 4, 85747 Garching, Germany
| | - Thomas F. Fässler
- Department Chemie, Technische Universität München, Lichtenbergstr. 4, 85747 Garching, Germany
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15
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Siggelkow L, Hlukhyy V, Fässler T. BaNi2Ge and Ca4Ni4Ge3 - Two layered Structures with $\rm ^2_\infty$[Ni2Ge] and, $\rm ^2_\infty$[Ni4Ge3] Networks. Z Anorg Allg Chem 2010. [DOI: 10.1002/zaac.201000083] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Siggelkow L, Hlukhyy V, Fässler T. Synthesis, Structure and Chemical Bonding of CaCo2Si2and BaCo2Ge2- Two New Compounds with ThCr2Si2Structure Type. Z Anorg Allg Chem 2010. [DOI: 10.1002/zaac.200900533] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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17
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Hlukhyy V, Fässler TF. Synthesis, Structure, and Bonding of Ca2Ni3Ge2and Comparison with CaNiGe, SrNi2Ge, and Ca3Ni3Si2. Z Anorg Allg Chem 2010. [DOI: 10.1002/zaac.200900487] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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18
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Hlukhyy V, Fässler TF, Claus P. New Germanium-rich Compounds SrCo5-xGe9(x= 0.39 and 0.28) with Optimized Co-Ge Bonding. Z Anorg Allg Chem 2009. [DOI: 10.1002/zaac.200900058] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Wang JQ, Stegmaier S, Fässler T. [Co@Ge10]3−: An Intermetalloid Cluster with Archimedean Pentagonal Prismatic Structure. Angew Chem Int Ed Engl 2009. [DOI: 10.1002/ange.200805511] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Wang JQ, Stegmaier S, Fässler T. [Co@Ge10]3−: An Intermetalloid Cluster with Archimedean Pentagonal Prismatic Structure. Angew Chem Int Ed Engl 2009; 48:1998-2002. [DOI: 10.1002/anie.200805511] [Citation(s) in RCA: 142] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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