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

authors	Ben-Arfa, BAE; Salvado, IMM; Ferreira, JMF; Pullar, RC
nationality	International
journal	CERAMICS INTERNATIONAL
author keywords	Sol-gel; Bioactive glass; Sintering; And density; Lanthanum; Copper
keywords	DOPED BIOACTIVE GLASS; MECHANICAL-PROPERTIES; COPPER; OXIDE; CRYSTALLIZATION; DECOMPOSITION; SYSTEM; IONS
abstract	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.
publisher	ELSEVIER SCI LTD
issn	0272-8842
year published	2019
volume	45
issue	8
beginning page	10269
ending page	10278
digital object identifier (doi)	10.1016/j.ceramint.2019.02.081
web of science category	Materials Science, Ceramics
subject category	Materials Science
unique article identifier	WOS:000465058500074