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Title: Synthesis-controlled polymorphism and magnetic and electrochemical properties of Li3Co2SbO6
Authors: Brown, AJ
Xia, Q
Avdeev, M
Kennedy, BJ
Ling, CD
Keywords: Chemical properties
Magnetic properties
Phase transformations
Lithium ion batteries
Issue Date: 4-Oct-2019
Publisher: American Chemical Society
Citation: Brown, A. J., Xia, Q., Avdeev, M., Kennedy, B. J., & Ling, C. D. (2019). Synthesis-controlled polymorphism and magnetic and electrochemical properties of Li3Co2SbO6. Inorganic chemistry, 58(20), 13881-13891. doi:10.1021/acs.inorgchem.9b01708
Abstract: Li3Co2SbO6 is found to adopt two highly distinct structural forms: a pseudohexagonal (monoclinic C2/m) layered O3-LiCoO2 type phase with “honeycomb” 2:1 ordering of Co and Sb, and an orthorhombic Fddd phase, isostructural with Li3Co2TaO6 but with the addition of significant Li/Co ordering. Pure samples of both phases can be obtained by conventional solid-state synthesis via a precursor route using Li3SbO4 and CoO, by controlling particle size, initial lithium excess, and reaction time. Both phases show relatively poor performance as lithium-ion battery cathode materials in their as-made states, but complex and interesting low-temperature magnetic properties. The honeycomb phase is the first of its type to show A-type antiferromagnetic order (ferromagnetic planes, antiferromagnetically coupled) below TN = 14 K. Isothermal magnetization and in-field neutron diffraction below TN show clear evidence for a metamagnetic transition at H ≈ 0.7 T to three-dimensional ferromagnetic order. The orthorhombic phase orders antiferromagnetically below TN = 112 K and then undergoes two more transitions at 80 and 60 K. Neutron diffraction data show that the ground state is incommensurate. © 2019 American Chemical Society
ISSN: 1520-510X
Appears in Collections:Journal Articles

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