Nanocrystalline BaCo 3 (VO 4 ) 2 (OH) 2 with a kagome lattice of Co( ii ) ions: synthesis, crystal structure and magnetic properties
Résumé
We report an initial magnetic study of highly crystalline nanoparticles of the layered-kagome compound BaCo3(VO4)(2)(OH)(2). Quasi-spherical nanoparticles with size in the range of 9-25 nm were elaborated for the first time via a new synthetic route at ambient pressure. Rietveld refinement of X-ray diffraction data, vibrational spectroscopies and high-resolution scanning transmission electron microscopy indicates that the rhombohedral crystal structure of BaCo3(VO4)(2)(OH)(2) is not modified by nanostructuring. Magnetisation measurements are consistent with high-spin Co2+ ions for which unquenched orbital angular momentum is present. Temperature-dependent magnetic susceptibility shows no apparent magnetic ordering or spin freezing down to 2 K and suggests finite-size or surface effects at low temperatures.
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