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In-Cage Interactions in the Clathrate Superconductor Sr8 Si46.


ABSTRACT: The clathrate?I superconductor Sr8 Si46 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 Na8 Si46 . 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.

SUBMITTER: Hubner JM 

PROVIDER: S-EPMC7004181 | biostudies-literature | 2020 Jan

REPOSITORIES: biostudies-literature

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In-Cage Interactions in the Clathrate Superconductor Sr<sub>8</sub> Si<sub>46</sub>.

Hübner Julia-Maria JM   Prots Yurii Y   Schnelle Walter W   Bobnar Matej M   König Markus M   Baitinger Michael M   Simon Paul P   Carrillo-Cabrera Wilder W   Ormeci Alim A   Svanidze Eteri E   Grin Yuri Y   Schwarz Ulrich U  

Chemistry (Weinheim an der Bergstrasse, Germany) 20191212 4


The clathrate I superconductor Sr<sub>8</sub> Si<sub>46</sub> 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 SrSi<sub>2</sub> . The crystal structure of the clathrate is isotypic to that of Na<sub>8</sub> Si<sub>46</sub> . Chemical bonding analysis reveals conventional covalent bonding within the silicon network as well as additional multi-at  ...[more]

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