Long-range ordered magnetic structures in Li2MnSiO4 and Li2CoSiO4

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dc.contributor.authorMohamed, Zen_AU
dc.contributor.authorAvdeev, Men_AU
dc.contributor.authorLing, CDen_AU
dc.date.accessioned2021-08-02T23:37:01Zen_AU
dc.date.available2021-08-02T23:37:01Zen_AU
dc.date.issued2014-08-12en_AU
dc.date.statistics2021-07-25en_AU
dc.description.abstractThe lithium orthosilicates Li2MnSiO4 and Li2CoSiO4 have been synthesized by solid state reaction and characterized using X-ray powder diffraction (XRD), magnetic susceptibility measurement, heat capacity and neutron powder diffraction (NPD). The monoclinic Li2MnSiO4 and orthorhombic Li2CoSiO4 compound were found to be antiferromagnetically ordered below Neel temperature = ~12 K and ~13 K respectively. The ordered magnetic structures of both compounds have been solved for the first time using low temperature neutron diffraction data. The magnetic structure of Li2CoSiO4 can be described as antiferromagnetic quasi-layers stacked along the a-axis. The ordered magnetic moments of the Co2+ and Mn2+ are aligned perpendicularly and obliquely to the distorted closed-packed layers of oxygen atoms and the values, 2.9 bohr magneton and 4.6 Bohr magneton, are close to the expected values for d7 Co2+ and d5 Mn2+, respectively. The origin of these complex magnetic structures will be discussed in terms of super-superexchange interactions among the transition metal ions, mediated by bridging SiO4 tetrahedra. Figure 1: Magnetic sublattices in Li2CoSiO4 (left) and Li2MnSiO4 (right) with respect to crystal structure. Blue, yellow, and light and dark green show the M, Si, and Li1 and Li2 sites in Pbn21 Li2CoSiO4 and P21/n Li2MnSiO4. © International Union of Crystallographyen_AU
dc.identifier.citationMohamed, Z., Avdeev, M., & Ling, C. (2014). Long-range ordered magnetic structures in Li2MnSiO4 and Li2CoSiO4. Paper presented at the XXIII IUCr Congress, Montreal, Canada, 5-12 August. In Acta Crystallographica Section A: Foundations and Advances, A70, C1365 doi:10.1107/S2053273314086343en_AU
dc.identifier.conferenceenddate12 August 2016en_AU
dc.identifier.conferencenameXXIII IUCr Congressen_AU
dc.identifier.conferenceplaceMontreal, Canadaen_AU
dc.identifier.conferencestartdate5 August 2016en_AU
dc.identifier.issn2053-2733en_AU
dc.identifier.issueA1en_AU
dc.identifier.journaltitleActa Crystallographica Section A: Foundations and Advancesen_AU
dc.identifier.paginationC1365en_AU
dc.identifier.urihttps://doi.org/10.1107/S2053273314086343en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/11244en_AU
dc.identifier.volume70en_AU
dc.language.isoenen_AU
dc.publisherInternational Union of Crystallographyen_AU
dc.subjectX-ray diffractionen_AU
dc.subjectNeutron diffractionen_AU
dc.subjectAntiferromagnetismen_AU
dc.subjectMonoclinic latticesen_AU
dc.subjectMagnetic susceptibilityen_AU
dc.subjectTransition elementsen_AU
dc.subjectMagnetic momentsen_AU
dc.subjectNeel temperatureen_AU
dc.titleLong-range ordered magnetic structures in Li2MnSiO4 and Li2CoSiO4en_AU
dc.typeConference Abstracten_AU
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