Nanocrystalline BaCo3(VO4)2(OH)2 with a kagome lattice of Co(ii) ions: synthesis, crystal structure and magnetic properties. Issue 9 (18th February 2022)

• Record Type: Journal Article
• Authors: Dessapt, R.; Lajaunie, L.; Calvino, J. J.; Deniard, P.; Trenque, I.; Payen, C.
• Is Part Of: Journal of materials chemistry. Volume 10:Issue 9(2022)
• Page Start: 3287
• Page End: 3291
• Publication Date: 2022-02-18
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d1tc04372b
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : Highly crystalline nanoparticles of BaCo3 (VO4 )2 (OH)2 have been prepared via a new soft-chemistry route, allowing an initial magnetic study of this high-spin d 7 layered-kagome compound, which is the Co 2+ analogue of the copper mineral vesignieite. Abstract : 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 Co 2+ 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.