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Hübner JM, Carrillo-Cabrera W, Kozelj P, Prots Y, Baitinger M, Schwarz U, Jung W. A Borosilicide with Clathrate VIII Structure. J Am Chem Soc 2022; 144:13456-13460. [PMID: 35875975 PMCID: PMC9377393 DOI: 10.1021/jacs.2c04745] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
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The high-pressure phase Na8BxSi46–x (3 < x < 5) is the first representative of a borosilicide crystallizing
in the rarely occurring clathrate VIII type structure. Crystals with
composition Na8B4Si42 (space group I43̅m; a = 9.7187(2)
Å; Pearson symbol cI54) were obtained at 5–8
GPa and 1200 K. The clathrate I modification exists for the same composition
at lower pressure with a larger cell volume (Pm3̅n; a = 9. 977(2) Å; cP54). Profound structural adaptions allow for a higher density of
the clathrate VIII type than clathrate I, opening up the perspective
of obtaining clathrate VIII type compounds as high-pressure forms
of clathrate I.
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Affiliation(s)
- Julia-Maria Hübner
- Department of Chemistry, Centre for Analysis and Synthesis, Naturvetarvägen 14, 221 00 Lund, Sweden.,Max-Planck-Institute for Chemical Physics for Solids, 01187 Dresden, Germany
| | | | - Primoz Kozelj
- Max-Planck-Institute for Chemical Physics for Solids, 01187 Dresden, Germany
| | - Yurii Prots
- Max-Planck-Institute for Chemical Physics for Solids, 01187 Dresden, Germany
| | - Michael Baitinger
- Max-Planck-Institute for Chemical Physics for Solids, 01187 Dresden, Germany
| | - Ulrich Schwarz
- Max-Planck-Institute for Chemical Physics for Solids, 01187 Dresden, Germany
| | - Walter Jung
- Max-Planck-Institute for Chemical Physics for Solids, 01187 Dresden, Germany
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Dopilka A, Childs A, Ovchinnikov A, Zhao R, Bobev S, Peng X, Chan CK. Structural and Electrochemical Properties of Type VIII Ba 8Ga 16-δSn 30+δ Clathrate (δ ≈ 1) during Lithiation. ACS APPLIED MATERIALS & INTERFACES 2021; 13:42564-42578. [PMID: 34477361 PMCID: PMC8447186 DOI: 10.1021/acsami.1c07240] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/20/2021] [Accepted: 08/04/2021] [Indexed: 06/13/2023]
Abstract
Clathrates of the tetrel (Tt = Si, Ge, Sn) elements are host-guest structures that can undergo Li alloying reactions with high capacities. However, little is known about how the cage structure affects the phase transformations that take place during lithiation. To further this understanding, the structural changes of the type VIII clathrate Ba8Ga16-δSn30+δ (δ ≈ 1) during lithiation are investigated and compared to those in β-Sn with ex situ X-ray total scattering measurements and pair distribution function (PDF) analysis. The results show that the type VIII clathrate undergoes an alloying reaction to form Li-rich amorphous phases (LixBa0.17Ga0.33Sn0.67, x = 2-3) with local structures similar to those in the crystalline binary Li-Sn phases that form during the lithiation of β-Sn. As a result of the amorphous phase transition, the type VIII clathrate reacts at a lower voltage (0.25 V vs Li/Li+) compared to β-Sn (0.45 V) and goes through a solid-solution reaction after the initial conversion of the crystalline clathrate phase. Cycling experiments suggest that the amorphous phase persists after the first lithiation and results in considerably better cycling than in β-Sn. Density functional theory (DFT) calculations suggest that topotactic Li insertion into the clathrate lattice is not favorable due to the high energy of the Li sites, which is consistent with the experimentally observed amorphous phase transformation. The local structure in the clathrate featuring Ba atoms surrounded by a cage of Ga and Sn atoms is hypothesized to kinetically circumvent the formation of Li-Sn or Li-Ga crystalline phases, which results in better cycling and a lower reaction voltage. Based on the improved electrochemical performance, clathrates could act as tunable precursors to form amorphous Li alloying phases with novel electrochemical properties.
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Affiliation(s)
- Andrew Dopilka
- Materials
Science and Engineering, School for Engineering of Matter, Transport
and Energy, Arizona State University, P.O. Box 876106, Tempe, Arizona 85827, United
States
| | - Amanda Childs
- Department
of Chemistry and Biochemistry, University
of Delaware, Newark, Delaware 19716, United States
| | - Alexander Ovchinnikov
- Department
of Chemistry and Biochemistry, University
of Delaware, Newark, Delaware 19716, United States
- Department
of Materials and Environmental Chemistry, Stockholm University, Svante Arrhenius väg 16 C, 10691 Stockholm, Sweden
| | - Ran Zhao
- School
of Molecular Sciences, Arizona State University, P.O. Box 871604, Tempe, Arizona 85287, United
States
| | - Svilen Bobev
- Department
of Chemistry and Biochemistry, University
of Delaware, Newark, Delaware 19716, United States
| | - Xihong Peng
- College
of Integrative Sciences and Arts, Arizona
State University Polytechnic Campus, Mesa, Arizona 85212, United States
| | - Candace K. Chan
- Materials
Science and Engineering, School for Engineering of Matter, Transport
and Energy, Arizona State University, P.O. Box 876106, Tempe, Arizona 85827, United
States
- Department
of Heterogenous Catalysis, Max-Planck-Institut
für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany
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4
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Feng X, Bobnar M, Lerch S, Biller H, Schmidt M, Baitinger M, Strassner T, Grin Y, Böhme B. Type-II Clathrate Na 24-δ Ge 136 from a Redox-Preparation Route. Chemistry 2021; 27:12776-12787. [PMID: 34270132 PMCID: PMC8518416 DOI: 10.1002/chem.202102082] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2021] [Indexed: 11/17/2022]
Abstract
The metastable type-II clathrate Na24-δ Ge136 was obtained from Na12 Ge17 by applying a two-step procedure. At first, Na12 Ge17 was reacted at 70 °C with a solution of benzophenone in the ionic liquid (IL) 1,3-dibutyl-2-methylimidazolium-bis(trifluoromethylsulfonyl) azanide. The IL was inert towards Na12 Ge17 , but capable of dissolving the sodium salts formed in the redox reaction. By annealing at 340 °C under an argon atmosphere, the X-ray amorphous intermediate product was transformed to crystalline Na24-δ Ge136 (δ≈2) and α-Ge in an about 1 : 1 mass ratio. The product was characterized by X-ray powder diffraction, chemical analysis, and 23 Na solid-state NMR spectroscopy. Metallic properties of Na24-δ Ge136 were revealed by a significant Knight shift of the 23 Na NMR signals and by a Pauli-paramagnetic contribution to the magnetic susceptibility. At room temperature, Na24-δ Ge136 slowly ages, with a tendency to volume decrease and sodium loss.
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Affiliation(s)
- Xian‐Juan Feng
- Max-Planck-Institut für Chemische Physik fester StoffeAbteilung Chemische MetallkundeNöthnitzer Straße 4001187DresdenGermany
| | - Matej Bobnar
- Max-Planck-Institut für Chemische Physik fester StoffeAbteilung Chemische MetallkundeNöthnitzer Straße 4001187DresdenGermany
- Jožef Stefan InstituteJamova 391000LjubljanaSlovenia
| | - Swantje Lerch
- Technische Universität DresdenFachrichtung Chemie und Lebensmittelchemie Professur für Physikalische Organische Chemie01062DresdenGermany
| | - Harry Biller
- Technische Universität DresdenFachrichtung Chemie und Lebensmittelchemie Professur für Physikalische Organische Chemie01062DresdenGermany
| | - Marcus Schmidt
- Max-Planck-Institut für Chemische Physik fester StoffeAbteilung Chemische MetallkundeNöthnitzer Straße 4001187DresdenGermany
| | - Michael Baitinger
- Max-Planck-Institut für Chemische Physik fester StoffeAbteilung Chemische MetallkundeNöthnitzer Straße 4001187DresdenGermany
| | - Thomas Strassner
- Technische Universität DresdenFachrichtung Chemie und Lebensmittelchemie Professur für Physikalische Organische Chemie01062DresdenGermany
| | - Yuri Grin
- Max-Planck-Institut für Chemische Physik fester StoffeAbteilung Chemische MetallkundeNöthnitzer Straße 4001187DresdenGermany
| | - Bodo Böhme
- Max-Planck-Institut für Chemische Physik fester StoffeAbteilung Chemische MetallkundeNöthnitzer Straße 4001187DresdenGermany
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Agnarelli L, Prots Y, Burkhardt U, Schmidt M, Koželj P, Leithe-Jasper A, Grin Y. Mg 3Pt 2: Anionic Chains in a Eu 3Ga 2-Type Structure. Inorg Chem 2021; 60:13681-13690. [PMID: 34428036 PMCID: PMC8424623 DOI: 10.1021/acs.inorgchem.1c01995] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
Abstract
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The binary phase Mg3Pt2 was prepared by direct
reaction between the elements or by spark-plasma synthesis starting
with MgH2 and PtCl2. The compound crystallizes
in the monoclinic space group C2/c with a = 7.2096(3) Å, b =
7.1912(4) Å, c = 6.8977(3) Å, and β
= 106.072(3)° and is isotypic to Eu3Ga2. Analysis of the electron density within the quantum theory of atoms
in molecules shows a significant charge transfer from Mg to Pt in
agreement with the electronegativity difference. Further study of
the chemical bonding with the electron localizability approach reveals
the formation of Pt chains stabilized by a complex system of multicenter
interactions involving Mg and Pt species. The metallic character of
Mg3Pt2 is confirmed by electronic structure
calculations and physical measurements. Mg3Pt2 is a new phase in the Mg−Pt
system with a crystal structure built up by anionic Pt chains, which
are stabilized by an interplay of multiatomic bonding interactions
of Mg with Pt. Mg3Pt2 is a metallic diamagnet.
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Affiliation(s)
- Laura Agnarelli
- Max-Planck-Institut für Chemische Physik fester Stoffe, Dresden 01187, Germany
| | - Yurii Prots
- Max-Planck-Institut für Chemische Physik fester Stoffe, Dresden 01187, Germany
| | - Ulrich Burkhardt
- Max-Planck-Institut für Chemische Physik fester Stoffe, Dresden 01187, Germany
| | - Marcus Schmidt
- Max-Planck-Institut für Chemische Physik fester Stoffe, Dresden 01187, Germany
| | - Primož Koželj
- Max-Planck-Institut für Chemische Physik fester Stoffe, Dresden 01187, Germany
| | | | - Yuri Grin
- Max-Planck-Institut für Chemische Physik fester Stoffe, Dresden 01187, Germany
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Hübner JM, Jung W, Schmidt M, Bobnar M, Koželj P, Böhme B, Baitinger M, Etter M, Grin Y, Schwarz U. Cage Adaption by High-Pressure Synthesis: The Clathrate-I Borosilicide Rb 8B 8Si 38. Inorg Chem 2021; 60:2160-2167. [PMID: 33104343 PMCID: PMC7887739 DOI: 10.1021/acs.inorgchem.0c02357] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Rb8B8Si38 forms under high-pressure, high-temperature conditions at p = 8 GPa and T = 1273 K. The new compound (space group Pm3̅n, a = 9.9583(1) Å) is the second example for a clathrate-I borosilicide. The phase is inert against strong acids and bases and thermally stable up to 1300 K at ambient pressure. (Rb+)8(B-)8(Si0)38 is electronically balanced, diamagnetic, and shows semiconducting behavior with moderate Seebeck coefficient below 300 K. Chemical bonding analysis by the electron localizability approach confirms the description of Rb8B8Si38 as Zintl phase.
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Affiliation(s)
- Julia-Maria Hübner
- Department of Chemical Metals Science, Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Straße 40, Dresden 01187, Germany
| | - Walter Jung
- Department of Chemical Metals Science, Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Straße 40, Dresden 01187, Germany
| | - Marcus Schmidt
- Department of Chemical Metals Science, Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Straße 40, Dresden 01187, Germany
| | - Matej Bobnar
- Department of Chemical Metals Science, Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Straße 40, Dresden 01187, Germany
| | - Primož Koželj
- Department of Chemical Metals Science, Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Straße 40, Dresden 01187, Germany
| | - Bodo Böhme
- Department of Chemical Metals Science, Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Straße 40, Dresden 01187, Germany
| | - Michael Baitinger
- Department of Chemical Metals Science, Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Straße 40, Dresden 01187, Germany
| | - Martin Etter
- Department of Chemical Metals Science, Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Straße 40, Dresden 01187, Germany
| | - Yuri Grin
- Department of Chemical Metals Science, Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Straße 40, Dresden 01187, Germany
| | - Ulrich Schwarz
- Department of Chemical Metals Science, Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Straße 40, Dresden 01187, Germany
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Cherniushok O, Cardoso-Gil R, Parashchuk T, Grin Y, Wojciechowski KT. Phase Equilibria and Thermoelectric Properties in the Pb–Ga–Te System in the Vicinity of the PbGa6Te10 Phase. Inorg Chem 2021; 60:2771-2782. [DOI: 10.1021/acs.inorgchem.0c03549] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Oleksandr Cherniushok
- Faculty of Materials Science and Ceramics, AGH University of Science and Technology, 30 Mickiewicza Avenue, Krakow 30-059, Poland
| | - Raul Cardoso-Gil
- Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Str. 40, Dresden 01187, Germany
| | - Taras Parashchuk
- Lukasiewicz Research Network—Krakow Institute of Technology, 73 Zakopianska Street, Krakow 30-418, Poland
| | - Yuri Grin
- Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Str. 40, Dresden 01187, Germany
| | - Krzysztof T. Wojciechowski
- Faculty of Materials Science and Ceramics, AGH University of Science and Technology, 30 Mickiewicza Avenue, Krakow 30-059, Poland
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9
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Sichevych O, Flipo S, Ormeci A, Bobnar M, Akselrud L, Prots Y, Burkhardt U, Gumeniuk R, Leithe-Jasper A, Grin Y. Crystal Structure and Physical Properties of the Cage Compound Hf 2B 2-2δIr 5+δ. Inorg Chem 2020; 59:14280-14289. [PMID: 32946694 PMCID: PMC7586331 DOI: 10.1021/acs.inorgchem.0c02073] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
Abstract
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Hf2B2–2δIr5+δ crystallizes
with a new type of structure: space group Pbam, a = 5.6300(3) Å, b = 11.2599(5)
Å, and c = 3.8328(2) Å. Nearly 5% of the
boron pairs are randomly replaced by single iridium atoms (Ir5+δB2–2δ). From an analysis of
the chemical bonding, the crystal structure can be understood as a
three-dimensional framework stabilized by covalent two-atom B–B
and Ir–Ir as well as three-atom Ir–Ir–B and Ir–Ir–Ir
interactions. The hafnium atoms center 14-atom cavities and transfer
a significant amount of charge to the polyanionic boron–iridium
framework. This refractory boride displays moderate hardness and is
a Pauli paramagnet with metallic electrical resistivity, Seebeck coefficient,
and thermal conductivity. The metallic character of this system is
also confirmed by electronic structure calculations revealing 5.8
states eV–1 fu–1 at the Fermi
level. Zr2B2–2δIr5+δ is found to be isotypic with Hf2B2–2δIr5+δ, and both form a continuous solid solution. Hf2Ir5+δB2−2δ is a cage compound with a three-dimensional
anionic boron−iridium
framework composed of [B2Ir8] units with cavities
bearing the hafnium cations. Zr2Ir5+δB2−2δ is found to be isotypic with Hf2Ir5+δB2−2δ, and both form
a continuous solid solution.
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Affiliation(s)
- Olga Sichevych
- Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Straße 40, 01187 Dresden, Germany
| | - Sever Flipo
- Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Straße 40, 01187 Dresden, Germany.,Institut für Experimentelle Physik, TU Bergakademie Freiberg, Leipziger Straße 23, 09599 Freiberg, Germany
| | - Alim Ormeci
- Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Straße 40, 01187 Dresden, Germany
| | - Matej Bobnar
- Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Straße 40, 01187 Dresden, Germany
| | - Lev Akselrud
- Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Straße 40, 01187 Dresden, Germany
| | - Yurii Prots
- Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Straße 40, 01187 Dresden, Germany
| | - Ulrich Burkhardt
- Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Straße 40, 01187 Dresden, Germany
| | - Roman Gumeniuk
- Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Straße 40, 01187 Dresden, Germany.,Institut für Experimentelle Physik, TU Bergakademie Freiberg, Leipziger Straße 23, 09599 Freiberg, Germany
| | - Andreas Leithe-Jasper
- Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Straße 40, 01187 Dresden, Germany
| | - Yuri Grin
- Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Straße 40, 01187 Dresden, Germany
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Baitinger M, Böhme B, Wagner FR, Schwarz U. Zintl Defects in Intermetallic Clathrates. Z Anorg Allg Chem 2020. [DOI: 10.1002/zaac.202000107] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Michael Baitinger
- Max‐Planck‐Institut für Chemische Physik fester Stoffe Nöthnitzer Straße 40 01187 Dresden Germany
| | - Bodo Böhme
- Max‐Planck‐Institut für Chemische Physik fester Stoffe Nöthnitzer Straße 40 01187 Dresden Germany
| | - Frank R. Wagner
- Max‐Planck‐Institut für Chemische Physik fester Stoffe Nöthnitzer Straße 40 01187 Dresden Germany
| | - Ulrich Schwarz
- Max‐Planck‐Institut für Chemische Physik fester Stoffe Nöthnitzer Straße 40 01187 Dresden Germany
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Schwarz U, Castillo R, Hübner JM, Wosylus A, Prots Y, Bobnar M, Grin Y. The untypical high-pressure Zintl phase SrGe6. ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES 2020. [DOI: 10.1515/znb-2019-0197] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Abstract
The binary strontium germanide SrGe6 was synthesized at high-pressure high-temperature conditions of approximately 10 GPa and typically 1400 K before quenching to ambient conditions. At ambient pressure, SrGe6 decomposes in a monotropic fashion at T = 680(10) K into SrGe2 and Ge, indicating its metastable character. Single-crystal X-ray diffraction data indicate that the compound SrGe6 adopts a new monoclinic structure type comprising a unique three-dimensional framework of germanium atoms with unusual cages hosting the strontium cations. Quantum chemical analysis of the chemical bonding shows that the framework consists of three- and four- bonded germanium atoms yielding the precise electron count Sr[(4bGe0]4[(3b)Ge−]2 in accordance with the 8 − N rule and the Zintl concept. Conflicting with that, a pseudo-gap in the electronic density of states appears clearly below the Fermi level, and elaborate bonding analysis reveals additional Sr–Ge interactions in the concave coordination polyhedron of the strontium atoms.
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Affiliation(s)
- Ulrich Schwarz
- Max-Planck-Institut für Chemische Physik fester Stoffe , Nöthnitzer Straße 40, 01187 Dresden , Germany
| | - Rodrigo Castillo
- Max-Planck-Institut für Chemische Physik fester Stoffe , Nöthnitzer Straße 40, 01187 Dresden , Germany
| | - Julia M. Hübner
- Max-Planck-Institut für Chemische Physik fester Stoffe , Nöthnitzer Straße 40, 01187 Dresden , Germany
| | - Aron Wosylus
- Max-Planck-Institut für Chemische Physik fester Stoffe , Nöthnitzer Straße 40, 01187 Dresden , Germany
| | - Yurii Prots
- Max-Planck-Institut für Chemische Physik fester Stoffe , Nöthnitzer Straße 40, 01187 Dresden , Germany
| | - Matej Bobnar
- Max-Planck-Institut für Chemische Physik fester Stoffe , Nöthnitzer Straße 40, 01187 Dresden , Germany
| | - Yuri Grin
- Max-Planck-Institut für Chemische Physik fester Stoffe , Nöthnitzer Straße 40, 01187 Dresden , Germany
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12
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Hübner JM, Prots Y, Schnelle W, Bobnar M, König M, Baitinger M, Simon P, Carrillo-Cabrera W, Ormeci A, Svanidze E, Grin Y, Schwarz U. In-Cage Interactions in the Clathrate Superconductor Sr 8 Si 46. Chemistry 2020; 26:830-838. [PMID: 31652015 PMCID: PMC7004181 DOI: 10.1002/chem.201904170] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2019] [Revised: 10/23/2019] [Indexed: 11/30/2022]
Abstract
The clathrate I superconductor Sr8Si46 is obtained under high‐pressure high‐temperature conditions, at 5 GPa and temperatures in the range of 1273 to 1373 K. At ambient pressure, the compound decomposes upon heating at T=796(5) K into Si and SrSi2. The crystal structure of the clathrate is isotypic to that of Na8Si46. Chemical bonding analysis reveals conventional covalent bonding within the silicon network as well as additional multi‐atomic interactions between Sr and Si within the framework cages. Physical measurements indicate a bulk BCS type II superconducting state below Tc=3.8(3) K.
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Affiliation(s)
- Julia-Maria Hübner
- Chemische Metallkunde, Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Straße 40, 01187, Dresden, Germany
| | - Yurii Prots
- Chemische Metallkunde, Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Straße 40, 01187, Dresden, Germany
| | - Walter Schnelle
- Chemische Metallkunde, Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Straße 40, 01187, Dresden, Germany
| | - Matej Bobnar
- Chemische Metallkunde, Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Straße 40, 01187, Dresden, Germany
| | - Markus König
- Chemische Metallkunde, Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Straße 40, 01187, Dresden, Germany
| | - Michael Baitinger
- Chemische Metallkunde, Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Straße 40, 01187, Dresden, Germany
| | - Paul Simon
- Chemische Metallkunde, Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Straße 40, 01187, Dresden, Germany
| | - Wilder Carrillo-Cabrera
- Chemische Metallkunde, Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Straße 40, 01187, Dresden, Germany
| | - Alim Ormeci
- Chemische Metallkunde, Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Straße 40, 01187, Dresden, Germany
| | - Eteri Svanidze
- Chemische Metallkunde, Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Straße 40, 01187, Dresden, Germany
| | - Yuri Grin
- Chemische Metallkunde, Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Straße 40, 01187, Dresden, Germany
| | - Ulrich Schwarz
- Chemische Metallkunde, Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Straße 40, 01187, Dresden, Germany
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