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Article Dans Une Revue Dalton Transactions Année : 2023

Micro- and nanostructured layered-kagome zinc orthovanadate BaZn 3 (VO 4 ) 2 (OH) 2

Résumé

Pure micro- and nanocrystalline powders of the layered-kagome zinc orthovanadate BaZn3(VO4)(2)(OH)(2) have been successfully prepared and thoroughly characterised. Microstructured samples (BaZn3-MPs) have been produced by hydrothermal reaction using synthetic martyite Zn3V2O7(OH)(2)2H(2)O as the starting reagent. Nanoparticles (NPs) with an average size of approximate to 60 nm (BaZn3-NPs-7 h) or approximate to 50 nm (BaZn3-NPs-25 min) have been obtained by using a coprecipitation method at ambient pressure, and by varying the stirring time. Rietveld refinements of X-ray diffraction data indicate that micro- and nanostructured BaZn3(VO4)(2)(OH)(2) both crystallize in a Rm structure very similar to that of the known layered-kagome compound BaCo3(VO4)(2)(OH)(2). Transmission electron microscopy observation of BaZn3-NPs-7 h and BaZn3-NPs-25 min reveals crystallized NPs with homogenous distributions of Ba, Zn, and V elements. FT-IR and Raman spectra show subtle differences between micro- and nanostructured samples which cannot be linked to any differences in the average crystal structures. The high resolution V-51 MAS NMR spectrum of BaZn3-MPs shows a single isotropic line attributed to VO43- groups with C-3v point group. The spectra of the nanostructured samples reveal the presence of a weak additional signal which decreases in intensity with increasing the NPs size, and which has been tentatively assigned to the presence at the surface of the NPs of a small amount of V5+ ions in a different chemical environment. Nanostructuring also impacts the optical properties of BaZn3(VO4)(2)(OH)(2). The UV-vis absorption spectra of NPs exhibit an additional weak transition in the visible domain which is not observed for the microstructured sample.
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hal-04316560 , version 1 (30-11-2023)

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Bachchar Hadrane, Philippe Deniard, Nicolas Gautier, Michael Paris, Christophe Payen, et al.. Micro- and nanostructured layered-kagome zinc orthovanadate BaZn 3 (VO 4 ) 2 (OH) 2. Dalton Transactions, 2023, 52 (45), pp.16927-16934. ⟨10.1039/d3dt03117a⟩. ⟨hal-04316560⟩
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