The effects of Cu2+ and La3+ doping on the sintering ability of sol-gel derived high silica bioglasses


This paper reports the hierarchical influence of co-doping copper and lanthanum in a sol-gel derived quaternary (Si, Ca, Na, P) bioactive glass on its sintering ability. The mutual effects of Cu & La on density, crystallisation and sinterability were investigated using Taguchi analysis. Thermal properties of bioglasses were assessed by DTA/TGA and dilatometry, while crystallisation phase evolution of was monitored by X-ray diffraction. Ten glass compositions were sintered at two temperatures (800 and 900 degrees C). The glass structure was analysed by MAS-NMR, the sintered density measured, and sintered microstructures observed by SEM/EDS. Results revealed that Cu promotes early densification, enhancing density at lower sintering temperatures. Oppositely, beneficial sintering effects of La might be observed at higher sintering temperatures (> 1000 degrees C). These differences are induced by the distinct roles of doping elements on devitrification upon increasing their concentrations: crystallisation is promoted by Cu and is inhibited by La.




Materials Science


Ben-Arfa, BAE; Salvado, IMM; Ferreira, JMF; Pullar, RC

nossos autores


R. C. Pullar wishes to thank the FCT (Fundacao para a Ciencia e a Tecnologia, Portugal) Grant IF/00681/2015 for supporting this work. B. A. E. Ben-Arfa thanks FCT grant BIONANOSCULP PTDC/EPH-PAT/6281/2014 for supporting him during this work. This work was developed within the scope of the project CICECO-Aveiro Institute of Materials, FCT Ref. UID/CTM/50011/2019, financed by national funds through the FCT/MCTES. Thanks to Dr Clara Piccirillo for carrying out the DTA/TGA measurements at CNR-Nanotec, Lecce, Italy.

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