Chemical and Structural Variety in Sodium Thioarsenate Glasses Studied by Neutron Diffraction and Supported by First-Principles Simulations

Sodium-conducting sulfide glasses are promising materials for the next generation of solid-state batteries. Deep insight into the glass structure is required to ensure a functional design and tailoring of vitreous alloys for energy applications. Using pulsed neutron diffraction supported by first-pr...

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Veröffentlicht in:Inorganic chemistry 2020-11, Vol.59 (22), p.16410-16420
Hauptverfasser: Kassem, Mohammad, Bounazef, Tinehinane, Fontanari, Daniele, Sokolov, Anton, Bokova, Maria, Hannon, Alex C, Bychkov, Eugene
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container_end_page 16420
container_issue 22
container_start_page 16410
container_title Inorganic chemistry
container_volume 59
creator Kassem, Mohammad
Bounazef, Tinehinane
Fontanari, Daniele
Sokolov, Anton
Bokova, Maria
Hannon, Alex C
Bychkov, Eugene
description Sodium-conducting sulfide glasses are promising materials for the next generation of solid-state batteries. Deep insight into the glass structure is required to ensure a functional design and tailoring of vitreous alloys for energy applications. Using pulsed neutron diffraction supported by first-principles molecular dynamics, we show a structural diversity of Na2S–As2S3 sodium thioarsenate glasses, consisting of long corner-sharing (CS) pyramidal chains CS-(AsSS2/2) k , small As p S q rings (p + q ≤ 11), mixed corner- and edge-sharing oligomers, edge-sharing (ES) dimers ES-As2S4, and isolated (ISO) pyramids ISO-AsS3, entirely or partially connected by sodium species. Polysulfide S–S bridges and structural units with homopolar As–As bonds complete the glass structure, which is basically different from structural motifs predicted by the equilibrium phase diagram. In contrast to superionic silver and sodium sulfide glasses, characterized by a significant population of isolated sulfur species Siso (0.20 < Siso/Stot < 0.28), that is, sulfur connected to only mobile cations M+ with a usual M/Siso stoichiometry of 2, poorly conducting Na2S–As2S3 alloys exhibit a modest Siso fraction of 6.2%.
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title Chemical and Structural Variety in Sodium Thioarsenate Glasses Studied by Neutron Diffraction and Supported by First-Principles Simulations
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