Raman spectroscopic study of bioactive silica based glasses

• Published in: Journal of non-crystalline solids 2003-06, Vol.320 (1), p.92-99
• Main Authors: González, P., Serra, J., Liste, S., Chiussi, S., León, B., Pérez-Amor, M.
• Format: Article
• Language: English
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Disordered solids; Exact sciences and technology; Glasses; Infrared and raman spectra and scattering; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Physics; Structure of solids and liquids; crystallography
• ISSN: 0022-3093; 1873-4812
• DOI: 10.1016/S0022-3093(03)00013-9

A study of the structure and bonding configuration of the bioactive glasses in the system Na 2O–CaO–P 2O 5–SiO 2 by Fourier transform Raman spectroscopy is presented. The assignment of the Raman lines, the changes in the Si–O–Si bond environment and the identification of the non-bridging silicon–oxygen groups (Si–O–NBO) for a wide range of silicate glasses are discussed. The frequency shifting and intensity variations of the Raman lines as a function of the bioactive glass composition are attributed to a decrease of the local symmetry originated by the addition of alkali and alkali earth oxides to the vitreous silica network. Correlation plots for the quantification of the Si–O–NBO groups as a function of the glass composition are also presented. These Raman analyses contribute to a better knowledge of the structural role of the network modifiers in the bioactive glasses and, as a consequence, improve the understanding of the bioactive process and the chemical routes of the CaP layer formation when exposed body fluids.