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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: 1.8] [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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Stegmaier S, Hlukhyy V, Fässler TF. The Intermetallic Type‐I Clathrate Na
8
Zn
4
Ge
42. Z Anorg Allg Chem 2020. [DOI: 10.1002/zaac.201900253] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Saskia Stegmaier
- Department of Chemistry Technische Universität München Lichtenbergstraße 4 85747 Garching Germany
| | - Viktor Hlukhyy
- Department of Chemistry Technische Universität München Lichtenbergstraße 4 85747 Garching Germany
| | - Thomas F. Fässler
- Department of Chemistry Technische Universität München Lichtenbergstraße 4 85747 Garching Germany
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Schäfer MC, Bobev S. Cu and Zn Substituted Silicon Clathrates with the Cubic Type‐II Structure: Synthesis and Characterization of Cs
8
Na
16
Cu
3.8
Si
132.2
and Cs
8
Na
16
Zn
6.9
Si
129.1. Z Anorg Allg Chem 2017. [DOI: 10.1002/zaac.201700236] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Marion C. Schäfer
- Department of Chemistry and Biochemistry University of Delaware 19716 Newark DE USA
| | - Svilen Bobev
- Department of Chemistry and Biochemistry University of Delaware 19716 Newark DE USA
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Earth Abundant Element Type I Clathrate Phases. MATERIALS 2016; 9:ma9090714. [PMID: 28773836 PMCID: PMC5457097 DOI: 10.3390/ma9090714] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/06/2016] [Revised: 08/08/2016] [Accepted: 08/15/2016] [Indexed: 11/16/2022]
Abstract
Earth abundant element clathrate phases are of interest for a number of applications ranging from photovoltaics to thermoelectrics. Silicon-containing type I clathrate is a framework structure with the stoichiometry A8-xSi46 (A = guest atom such as alkali metal) that can be tuned by alloying and doping with other elements. The type I clathrate framework can be described as being composed of two types of polyhedral cages made up of tetrahedrally coordinated Si: pentagonal dodecahedra with 20 atoms and tetrakaidecahedra with 24 atoms in the ratio of 2:6. The cation sites, A, are found in the center of each polyhedral cage. This review focuses on the newest discoveries in the group 13-silicon type I clathrate family: A8E8Si38 (A = alkali metal; E = Al, Ga) and their properties. Possible approaches to new phases based on earth abundant elements and their potential applications will be discussed.
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Synthesis and Structural Characterization of the New Clathrates K₈Cd₄Ge 42, Rb₈Cd₄Ge 42, and Cs₈Cd₄Ge 42. MATERIALS 2016; 9:ma9040236. [PMID: 28773361 PMCID: PMC5502883 DOI: 10.3390/ma9040236] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/03/2016] [Revised: 03/17/2016] [Accepted: 03/21/2016] [Indexed: 11/16/2022]
Abstract
This paper presents results from our exploratory work in the systems K-Cd-Ge, Rb-Cd-Ge, and Cs-Cd-Ge, which yielded the novel type-I clathrates with refined compositions K₈Cd3.77(7)Ge42.23, Rb₈Cd3.65(7)Ge42.35, and Cs7.80(1)Cd3.65(6)Ge42.35. The three compounds represent rare examples of clathrates of germanium with the alkali metals, where a d10 element substitutes a group 14 element. The three structures, established by single-crystal X-ray diffraction, indicate that the framework-building Ge atoms are randomly substituted by Cd atoms on only one of the three possible crystallographic sites. This and several other details of the crystal chemistry are elaborated.
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