The role of P2O5, TiO2 and ZrO2 as nucleating agents on microstructure and crystallization behaviour of lithium disilicate-based glass
authors Fernandes, HR; Tulyaganov, DU; Ferreira, JMF
nationality International
journal JOURNAL OF MATERIALS SCIENCE
keywords ALUMINOSILICATE GLASS; SILICATE-GLASSES; CRYSTAL NUCLEATION; THERMAL-ANALYSIS; LI2O-SIO2 GLASS; CERAMICS; SYSTEM; KINETICS; PHASES; AL2O3
abstract The aim of this study was to investigate the effects of different nucleating agents (P2O5, TiO2 and ZrO2) on the crystallization behaviour and the properties of a parent glass with composition 23.7 Li2O-2.63 K2O-2.63 Al2O3-71.78 SiO2 (mol%) and SiO2/Li2O molar ratio far beyond that of stoichiometric lithium disilicate (LD, Li2Si2O5). The scanning electron microscopy examination of the as-cast non-annealed glasses revealed the occurrence of liquid-liquid phase separation for all the compositions. P2O5 revealed to be effective in promoting bulk crystallization of LD, while TiO2 and ZrO2 led to surface crystallization. Moreover, ZrO2 enhances the glass polymerization and shifts T-p to higher temperatures, hindering crystallization. At 900 degrees C, TiO2-containing glasses feature LD and lithium metasilicate (LMS, Li2SiO3), while P2O5- and ZrO2-containing ones present monophasic LD and LMS glass-ceramics, respectively.
publisher SPRINGER
issn 0022-2461
year published 2013
volume 48
issue 2
beginning page 765
ending page 773
digital object identifier (doi) 10.1007/s10853-012-6793-4
web of science category Materials Science, Multidisciplinary
subject category Materials Science
unique article identifier WOS:000312903400022
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journal impact factor (jcr 2016): 2.599
5 year journal impact factor (jcr 2016): 2.522
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