Synthesis, crystal structure, and magnetic properties of oxynitride perovskites SrMn0.2M0.8O2.6N0.4 (M = Nb, Ta)

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dc.contributor.authorKim, YIen_AU
dc.contributor.authorAvdeev, Men_AU
dc.date.accessioned2021-07-16T03:32:44Zen_AU
dc.date.available2021-07-16T03:32:44Zen_AU
dc.date.issued2020-04-28en_AU
dc.date.statistics2021-07-08en_AU
dc.description.abstractComplex perovskites SrMn0.2Nb0.8O2.6N0.4 and SrMn0.2Ta0.8O2.6N0.4 were synthesized; these are rare examples of octahedral Mn2+ in oxynitride perovskites. Joint Rietveld refinement of neutron and X-ray data revealed that SrMn0.2Nb0.8O2.6N0.4 and SrMn0.2Ta0.8O2.6N0.4 had orthorhombic symmetries, in contrast with those of analogous perovskites SrM′0.2M0.8O3−xNx (M′ = Li, Na, Mg; M = Nb, Ta), which are all tetragonal. Both SrMn0.2Nb0.8O2.6N0.4 and SrMn0.2Ta0.8O2.6N0.4 exhibited paramagnetic behavior with effective magnetic moments of 5.60μB and 5.94μB, respectively, consistent with a high-spin Mn2+ (d5, S = 5/2) state. The Weiss constants were −24.7 K for SrMn0.2Nb0.8O2.6N0.4 and −15.4 K for SrMn0.2Ta0.8O2.6N0.4, indicating the presence of weak antiferromagnetic spin–spin interactions. The band gaps of SrMn0.2Nb0.8O2.6N0.4 and SrMn0.2Ta0.8O2.6N0.4 were determined to be 1.75 eV and 2.2 eV, respectively, suggesting that the Mn 3d electrons were essentially localized. © The Royal Society of Chemistry 2020en_AU
dc.identifier.citationKim, Y.-I., & Avdeev, M. (2020). Synthesis, crystal structure, and magnetic properties of oxynitride perovskites SrMn0.2M0.8O2.6N0.4 (M = Nb, Ta). Dalton Transactions, 49(19), 6471-6477. doi:10.1039/D0DT00907Een_AU
dc.identifier.issn1477-9234en_AU
dc.identifier.issue19en_AU
dc.identifier.journaltitleDalton Transactionsen_AU
dc.identifier.pagination6471-6477en_AU
dc.identifier.urihttps://doi.org/10.1039/D0DT00907Een_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/11076en_AU
dc.identifier.volume49en_AU
dc.language.isoenen_AU
dc.publisherRoyal Society of Chemistryen_AU
dc.subjectPerovskitesen_AU
dc.subjectNeutron diffractionen_AU
dc.subjectX-ray diffractionen_AU
dc.subjectOrthorhombic latticesen_AU
dc.subjectAntiferromagnetismen_AU
dc.subjectSpinen_AU
dc.subjectMagnetic momentsen_AU
dc.titleSynthesis, crystal structure, and magnetic properties of oxynitride perovskites SrMn0.2M0.8O2.6N0.4 (M = Nb, Ta)en_AU
dc.typeJournal Articleen_AU
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