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dc.contributor.authorHansen, B.
dc.contributor.authorPaskevicius, Mark
dc.contributor.authorJørgensen, M.
dc.contributor.authorJensen, T.
dc.date.accessioned2017-06-23T02:59:35Z
dc.date.available2017-06-23T02:59:35Z
dc.date.created2017-06-19T03:39:32Z
dc.date.issued2017
dc.identifier.citationHansen, B. and Paskevicius, M. and Jørgensen, M. and Jensen, T. 2017. Halogenated Sodium-closo-Dodecaboranes as Solid-State Ion Conductors. ZzChemical Materials. 29 (8): pp. 3423-3430.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/53361
dc.identifier.doi10.1021/acs.chemmater.6b04797
dc.description.abstract

Sodium compounds containing large weakly coordinating anions are explored as ion conductors. The halogenated sodium-closo-dodecaboranes (Na2B12Cl12, Na2B12Br12, and Na2B12I12) are all isostructural (Pa3¯) at room temperature. These compounds undergo an order-disorder polymorphic transition to Fm3¯m where Na+ partially occupies two crystallographic sites and [B12X12]2- anions undergo reorientational motion. These dynamic structural properties promote extreme Na+ ion conductivity up to 0.162 S/cm at elevated temperature (500 °C). The polymorphic transition temperatures increase down the halogen group (Cl < Br < I). These temperatures are much higher (475, 525, and 570 °C) than for Na2B12H12 (266 °C), which could be related to increasing anion size, mass, and the anisotropic electron density in the covalently bound halogens (B-X). The halogens may form Na-X interactions with increasing strength and directionality, which restrict dynamic motion until high temperature. The halogenated sodium-closo-dodecaboranes demonstrate excellent thermal stabilities (up to 500 °C) and may facilitate the development of new high temperature ion conductors.

dc.publisherAmerican Chemical Society
dc.titleHalogenated Sodium-closo-Dodecaboranes as Solid-State Ion Conductors
dc.typeJournal Article
dcterms.source.volume29
dcterms.source.number8
dcterms.source.startPage3423
dcterms.source.endPage3430
dcterms.source.issn0897-4756
dcterms.source.titleZzChemical Materials
curtin.departmentDepartment of Physics and Astronomy
curtin.accessStatusFulltext not available


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