Structural investigations of binary glasses Sb2O3-Na2O by Raman, FTIR and optical spectroscopy using Co2+as probe ion
M. T. Soltani1, S. Haddad1, D. Möncke2, E.I. Kamitsos3 and L. Wondraczek2
1Laboratoire de Physique photonique et nanomatériaux multifonctionnels, Université de Biskra, Algéria.
2Otto Schott Institute of Materials Research, University of Jena, Germany
3Theoretical and Physical Chemistry Institute, National Hellenic Research Foundation, Athens, Greece
Pure and cobalt doped binary glasses (90–x)Sb2
-xNa2O with x=10–40 mol% Na
2O, were prepared by the melt-quenching technique. CoO was added in trace levels of only 0
.05 mol % as probe ion of the structure of antimonate glasses. UV-Vis-NIR absorption spectroscopy showed a color change from blue-violet color for glasses with a low
content of Na2
O, to deep blue for glasses with high Na2
O levels. This color change was explained by the presence of both octahedral and tetrahedral sites of Co2+
the antimonate rich glasses, while the Co2+
coordination changes to a predominant tetrahedral one in the intense blue, Na2
O rich glasses.
The coordination change of Co2+
is on the basis of the optical basicity concept of Duffy and Ingram, and by changes in the antimonate glass structure, valence,
coordination, and connectivity. For structural studies, vibrational spectroscopy (infrared and Raman) was employed.
Figure1. Absorption spectra of Co doped (90-x)Sb2