Please use this identifier to cite or link to this item: https://apo.ansto.gov.au/dspace/handle/10238/11076
Title: Synthesis, crystal structure, and magnetic properties of oxynitride perovskites SrMn0.2M0.8O2.6N0.4 (M = Nb, Ta)
Authors: Kim, YI
Avdeev, M
Keywords: Perovskites
Neutron diffraction
X-ray diffraction
Orthorhombic lattices
Antiferromagnetism
Spin
Magnetic moments
Issue Date: 28-Apr-2020
Publisher: Royal Society of Chemistry
Citation: Kim, 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/D0DT00907E
Abstract: Complex 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 2020
URI: https://doi.org/10.1039/D0DT00907E
https://apo.ansto.gov.au/dspace/handle/10238/11076
ISSN: 1477-9234
Appears in Collections:Journal Articles

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