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Title: Structural, magnetic, and optical properties of A3V4(PO4)6 (A = Mg, Mn, Fe, Co, Ni)
Authors: Porter, SH
Xiong, J
Avdeev, M
Merz, D
Woodward, PM
Huang, Z
Keywords: Magnetic properties
Transistion elements
Neutron diffraction
Transition temperature
Issue Date: 26-May-2016
Publisher: American Chemical Society
Citation: Porter, S. H., Xiong, J., Avdeev, M., Merz, D., Woodward, P. M., & Huang, Z. (2016). Structural, magnetic, and optical properties of A3V4(PO4)6 (A = Mg, Mn, Fe, Co, Ni). Inorganic chemistry, 55(12), 5772-5779. doi:10.1021/acs.inorgchem.5b02755
Abstract: Combined synchrotron and neutron powder diffraction indicates that A3V4(PO4)6 (A = Mg, Mn, Fe, Co, Ni) compounds crystallize with triclinic P1̅ symmetry. Lattice parameters expand as expected with successive increases in the ionic radius of the A2+ ion. Cation disorder on the octahedral sites increases as the ionic radii of A2+ ion decreases. Direct-current magnetic susceptibility measurements indicate that all compounds with magnetic A2+ ions order anti-ferromagnetically with transition temperatures ranging from 12 to 15 K. Effective magnetic moments for A3V4(PO4)6 (A = Mg, Mn, Fe, Co, Ni) are 5.16, 11.04, 10.08, 9.76, and 7.96 μB per formula unit, respectively, in line with calculated values for high-spin transition metal ions. With the exception of Co3V4(PO4)6 the ultraviolet–visible spectra are dominated by d–d transitions of the V3+ ions. The striking emerald green color of Co3V4(PO4)6 arises from the combined effects of d–d transitions involving both V3+ and Co2+. © 2016 American Chemical Society
ISSN: 1520-510X
Appears in Collections:Journal Articles

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