abstract
The influence of varying the CaO/MgO ratio on the structure and thermal properties of CaO-MgO-SiO2-P2O5-CaF2 glasses was studied in a series of eight glass compositions in the glass forming region of diopside (CaMgSi2O6)-fluorapatite [Ca-5(PO4)(3)F]-wollastonite (CaSiO3) ternary system. The melt-quenched glasses were characterized for their structure by infrared spectroscopy (FTIR) and magic angle spinning (MAS)nuclear magnetic resonance (NMR) spectroscopy. Silicon is predominantly present as Q(2) (Si) species, while phosphorus tends to coordinate in orthophosphate environment. The sintering and crystallization parameters of the glasses were obtained from differential thermal analysis (DTA) while crystalline phase fractions in the sintered glass ceramics were analyzed by X-ray diffraction adjoined with Rietveld refinement. Diopside, fluorapatite, wollastonite and pseudowollastonite crystallized as the main crystalline phases in all the glass ceramics with their content varying with respect to variation in CaO/MgO ratio in glasses. The implications of structure and sintering behaviour of glasses on their bioactivity were discussed. Published by Elsevier Ltd.
keywords
MOLECULAR-DYNAMICS SIMULATIONS; SILICATE BIOACTIVE GLASSES; CERAMICS; DIOPSIDE; SPECTRA; SYSTEM; RAMAN; SPECTROSCOPY; MAGNESIUM; BEHAVIOR
subject category
Materials Science
authors
Kansal, I; Goel, A; Tulyaganov, DU; Rajagopal, RR; Ferreira, JMF
our authors
José Maria da Fonte Ferreira
Retired Professoracknowledgements
Ishu Kansal is thankful to FCT-Portugal for her doctoral research grant. The support of University of Aveiro and CICECO is highly appreciated.