A study on the thermal conversion of scheelite-type ABO(4) into perovskite-type AB(O,N)(3)

dc.contributor.authorLi, Wenjie
dc.contributor.authorLi, Duan
dc.contributor.authorGao, Xin
dc.contributor.authorGurlo, Aleksander
dc.contributor.authorZander, Stefan
dc.contributor.authorJones, Philip
dc.contributor.authorNavrotsky, Alexandra
dc.contributor.authorShen, Zhijian
dc.contributor.authorRiedel, Ralf
dc.contributor.authorIonescu, Emanuel
dc.date.accessioned2017-10-25T06:27:35Z
dc.date.available2017-10-25T06:27:35Z
dc.date.issued2015
dc.descriptionDieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG geförderten) Allianz- bzw. Nationallizenz frei zugänglich.de
dc.descriptionThis publication is with permission of the rights owner freely accessible due to an Alliance licence and a national licence (funded by the DFG, German Research Foundation) respectively.en
dc.description.abstractPhase-pure scheelite AMoO(4) and AWO(4) (A = Ba, Sr, Ca) were thermally treated under an ammonia atmosphere at 400 to 900 degrees C. SrMoO4 and SrWO4 were shown to convert into cubic perovskite SrMoO2N and SrWO1.5N1.5, at 700 degrees C and 900 degrees C respectively, and to form metastable intermediate phases (scheelite SrMoO4-xNx and SrWO4-xNx), as revealed by X-ray diffraction (XRD), elemental analysis and FTIR spectroscopy. High-temperature oxide melt solution calorimetry reveals that the enthalpy of formation for SrM(O,N)(3) (M = Mo, W) perovskites is less negative than that of the corresponding scheelite oxides, though the conversion of the scheelite oxides into perovskite oxynitrides is thermodynamically favorable at moderate temperatures. The reaction of BaMO4 with ammonia leads to the formation of rhombohedral Ba3M2(O,N)(8) and the corresponding binary metal nitrides Mo3N2 and W4.6N4; similar behavior was observed for CaMO4, which converted upon ammonolysis into individual oxides and nitrides. Thus, BaMO4 and CaMO4 were shown to not provide access to perovskite oxynitrides. The influence of the starting scheelite oxide precursor, the structure distortion and the degree of covalency of the B-site-N bond are discussed within the context of the formability of perovskite oxynitrides.en
dc.description.sponsorshipEC/FP7/264873/EU/FUnctional Nitrides for Energy Applications/FUNEAen
dc.identifier.eissn1477-9234
dc.identifier.issn1477-9226
dc.identifier.pmid25847542
dc.identifier.urihttps://depositonce.tu-berlin.de/handle/11303/6960
dc.identifier.urihttp://dx.doi.org/10.14279/depositonce-6299
dc.language.isoen
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/
dc.subject.ddc540 Chemie und zugeordnete Wissenschaftende
dc.titleA study on the thermal conversion of scheelite-type ABO(4) into perovskite-type AB(O,N)(3)en
dc.typeArticleen
dc.type.versionpublishedVersionen
dcterms.bibliographicCitation.doi10.1039/c5dt00711a
dcterms.bibliographicCitation.issue17
dcterms.bibliographicCitation.journaltitleDalton transactionsen
dcterms.bibliographicCitation.originalpublishernameRoyal Society of Chemistryde
dcterms.bibliographicCitation.originalpublisherplaceCambridgede
dcterms.bibliographicCitation.pageend8246
dcterms.bibliographicCitation.pagestart8238
dcterms.bibliographicCitation.volume44
tub.accessrights.dnbdomain
tub.affiliationFak. 3 Prozesswissenschaften::Inst. Werkstoffwissenschaften und -technologien::FG Keramische Werkstoffede
tub.affiliation.facultyFak. 3 Prozesswissenschaftende
tub.affiliation.groupFG Keramische Werkstoffede
tub.affiliation.instituteInst. Werkstoffwissenschaften und -technologiende
tub.publisher.universityorinstitutionTechnische Universität Berlin

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