I. J. Hidi, G. Melinte, R. Stefan, M. Bindea and L. Baia The study of the structure and bioactivity of the B2O3 • Na2O • P2O5 system Journal of Raman Spectroscopy 44
The influence of the chemical composition on the structural properties and bioactivity of xB2O3 • 30Na2O • (70 − x)P2O5 samples, with 0 ≤ x ≤ 70 mol%, is investigated. The Raman and Fourier transform infrared spectra show the existence of three concentration domains: 70 ≥ x ≥ 50 – borate, 40 ≥ x ≥ 30 – borophosphate, and 20 ≥ x ≥ 0 – phosphate region. The in vitro bioactivity assessment was performed by immersing the samples in simulated body fluids solution. Scanning electron microscope micrographs, Fourier transform infrared, and energy-dispersive X-ray spectra prove that the bioactive response strongly depends on the chemical composition. The samples with 30% and 20% B2O3 (mol%) show the highest bioactivity.
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