Please use this identifier to cite or link to this item: https://apo.ansto.gov.au/dspace/handle/10238/11244
Title: Long-range ordered magnetic structures in Li2MnSiO4 and Li2CoSiO4
Authors: Mohamed, Z
Avdeev, M
Ling, CD
Keywords: X-ray diffraction
Neutron diffraction
Antiferromagnetism
Monoclinic lattices
Magnetic susceptibility
Transition elements
Magnetic moments
Neel temperature
Issue Date: 12-Aug-2014
Publisher: International Union of Crystallography
Citation: Mohamed, 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/S2053273314086343
Abstract: The 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 Crystallography
URI: https://doi.org/10.1107/S2053273314086343
https://apo.ansto.gov.au/dspace/handle/10238/11244
ISSN: 2053-2733
Appears in Collections:Conference Publications

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