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Uncovering the Metastable γ-Ag2WO4 Phase: A Joint Experimental and Theoretical Study

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Uncovering the Metastable γ-Ag2WO4 Phase: A Joint Experimental and Theoretical Study

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dc.contributor.author	Alvarez Roca, Roman
dc.contributor.author	Lemos, Pablo S.
dc.contributor.author	Gracia Edo, Lourdes
dc.contributor.author	Andrés, Juan
dc.contributor.author	Longo, Elson
dc.date.accessioned	2018-03-21T15:39:36Z
dc.date.available	2018-03-21T15:39:36Z
dc.date.issued	2017
dc.identifier.citation	Alvarez Roca, Roman Lemos, Pablo S. Gracia Edo, Lourdes Andrés, Juan Longo, Elson 2017 Uncovering the Metastable γ-Ag2WO4 Phase: A Joint Experimental and Theoretical Study Rsc Advances 7 5610 5620
dc.identifier.uri	http://hdl.handle.net/10550/65484
dc.description.abstract	The synthesis of metastable solid phases is a pivotal starting point for innovative materials research. Here, we report the synthesis by means of a precipitation method of the metastable cubic γ-Ag2WO4 phase under ambient conditions. Different experimental techniques such as X-ray diffraction (XRD) with Rietveld refinement, field emission scanning electron microscopy (FE-SEM), micro-Raman/ultraviolet-visible (UV-vis) diffuse reflectance, photoluminescence spectroscopies, and differential scanning calorimetry (DSC) were employed. To complement the experimental data, the geometry, morphology, vibrational and electronic structure of γ-Ag2WO4 were characterized and evaluated using first-principles quantum mechanical calculations at the density functional theory (DFT) level. A theoretical model based on the Wulff construction was introduced to explain the possible crystal morphologies of the faceted crystals, which were obtained by tuning the surface chemistry of the crystals, and are related to their relative stability. Both the experimental and theoretical data revealed the presence of (100), (110), and (111) facets with low surface energies in the γ-Ag2WO4 crystals. When the surface energy value of the (111) surface was lowered, the experimental morphologies of the as-synthesized samples were similar to the theoretically obtained shapes. From the analysis of the experimental and calculated Raman spectra, PL emissions, and the density of states, we can assume that γ-Ag2WO4 is primarily formed by both distorted clusters: [WO4] tetrahedra and, distorted in a lesser extent, [AgO6] octahedra.
dc.language.iso	eng
dc.relation.ispartof	Rsc Advances, 2017, vol. 7, p. 5610-5620
dc.subject	Química analítica
dc.title	Uncovering the Metastable γ-Ag2WO4 Phase: A Joint Experimental and Theoretical Study
dc.type	journal article	es_ES
dc.date.updated	2018-03-21T15:39:37Z
dc.identifier.doi	10.1039/C6RA24692C
dc.identifier.idgrec	124136
dc.rights.accessRights	open access	es_ES