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Hadrane, B., Deniard, P., Gautier, N., Paris, M., Payen, C. & Dessapt, R. (2023) Micro- and nanostructured layered-kagome zinc orthovanadate BaZn3(VO4)2(OH)2. Dalton Trans. 52 16927–16934.
Added by: Richard Baschera (2023-11-30 16:06:46) Last edited by: Richard Baschera (2023-11-30 16:07:45) |
| Type de référence: Article DOI: 10.1039/D3DT03117A Numéro d'identification (ISBN etc.): 1477-9234 Clé BibTeX: Hadrane2023a Voir tous les détails bibliographiques  |
Catégories: IMN, MIOPS Créateurs: Deniard, Dessapt, Gautier, Hadrane, Paris, Payen Collection: Dalton Trans. |
Consultations : 1/112
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| Liens URLs https://pubs.rsc.o ... 2023/dt/d3dt03117a |
| Résumé |
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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)2·2H2O as the starting reagent. Nanoparticles (NPs) with an average size of ≈ 60 nm (BaZn3-NPs-7h) or ≈ 50 nm (BaZn3-NPs-25min) 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-7h and BaZn3-NPs-25min 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 51V MAS NMR spectrum of BaZn3-MPs shows a single isotropic line attributed to VO43− groups with C3v 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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| Notes |
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Publisher: The Royal Society of Chemistry
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