Novel anion conductors - conductivity, thermodynamic stability and hydration of anion-substituted mayenite-type cage compounds C(12)A(7):X (X = O, OH, Cl, F, CN, S, N)

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dc.contributor.authorEufinger, Jens-Peter
dc.contributor.authorSchmidt, Alexander
dc.contributor.authorLerch, Martin
dc.contributor.authorJanek, Jürgen
dc.date.accessioned2017-10-24T07:23:10Z
dc.date.available2017-10-24T07:23:10Z
dc.date.issued2015
dc.description.abstractMayenite (Ca12Al14O33) is a highly interesting functional material not only in view of its unique crystal structure as a cage compound but also for its variety of possible applications. Its ability to incorporate foreign ions into the cage structure opens the possibility to create new types of solid electrolytes and even electrides. Therefore, the conductivity of various anion substituted mayenites was measured as a function of temperature. Due to controversial reports on the stability of mayenite under specific thermodynamic conditions (dry, wet, reducing, and high temperature), a comprehensive study on the stability was performed. Mayenite is clearly not stable under dry conditions (ppm H2O < 100) at temperatures above 1050 degrees C, and thus, the mayenite phase vanishes from the calcium aluminate phase diagram below a minimum humidity. Two decomposition reactions were observed and are described in detail. To get further insight into the mechanism of hydration of mayenite, the conductivity was measured as a function of water vapour pressure in a range of -5 <= lg[pH(2)O/bar] <= -1.6 at temperatures ranging from 1000 degrees C <= theta <= 1200 degrees C. The hydration isotherms are described with high acuracy by the underlying point defect model, which is confirmed in a wide range of water vapour pressure.en
dc.identifier.eissn1463-9084
dc.identifier.issn1463-9076
dc.identifier.pmid25672809
dc.identifier.urihttps://depositonce.tu-berlin.de/handle/11303/6916
dc.identifier.urihttp://dx.doi.org/10.14279/depositonce-6255
dc.language.isoen
dc.rights.urihttps://creativecommons.org/licenses/by-nc/3.0/
dc.subject.ddc540 Chemie und zugeordnete Wissenschaftende
dc.titleNovel anion conductors - conductivity, thermodynamic stability and hydration of anion-substituted mayenite-type cage compounds C(12)A(7):X (X = O, OH, Cl, F, CN, S, N)en
dc.typeArticleen
dc.type.versionpublishedVersionen
dcterms.bibliographicCitation.doi10.1039/c4cp05442c
dcterms.bibliographicCitation.issue10
dcterms.bibliographicCitation.journaltitlePhysical chemistry, chemical physicsen
dcterms.bibliographicCitation.originalpublishernameRoyal Society of Chemistryde
dcterms.bibliographicCitation.originalpublisherplaceCambridgede
dcterms.bibliographicCitation.pageend6857
dcterms.bibliographicCitation.pagestart6844
dcterms.bibliographicCitation.volume17
tub.accessrights.dnbfree
tub.affiliationFak. 2 Mathematik und Naturwissenschaften::Inst. Chemie::FG Anorganische Chemie - Festkörper- und Materialchemiede
tub.affiliation.facultyFak. 2 Mathematik und Naturwissenschaftende
tub.affiliation.groupFG Anorganische Chemie - Festkörper- und Materialchemiede
tub.affiliation.instituteInst. Chemiede
tub.publisher.universityorinstitutionTechnische Universität Berlin

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