Resumo

GARCIA-AMAYA, I. V. et al. Estudio espectroscópico y morfología de vidrios de vanadato y wollastonita-2m. Superf. vacío [online]. 2014, vol.27, n.4, pp.116-122. ISSN 1665-3521.

Wollastonite from Encarnación Villa Juárez deposit located in Hidalgo, Mexico was used as raw material to fabricate glass using V2O5 as former oxide. Powder fusion at 1350°C was carried out for glass fabrication. The obtained glasses were of amber, gray and black color; the most transparent glasses are those with a composition of 60 to 65% wt. of V2O5and 40 to 35 % wt. of wollastonite. XRD patterns of the samples show the presence of wollastonite-2M and the VO2orthorhombic crystalline phase. FT-IR and Raman spectroscopies revealed the formation of metavanadates and pirovanadates groups. In addition, drop of phase separation caused by liquid-liquid immiscibility was observed by scanning electron microscopy imaging. XPS analysis was carried out to analyze vanadium oxidation state and bonding and non-bonding oxygen estimation. The curve fitting of the high resolution spectra of the V 2p3/2 peak showed the presence of V4+ and V5+ vanadium oxidation states for all glasses.

Palavras-chave : Vanadates; Wollastonite; Glasses.

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