Structure, properties and crystallization of non-stoichiometric lithium disilicate glasses containing CaF2

摘要: Abstract The role of CaF2 on the structure, crystallization behaviour and properties a relatively simple non-stoichiometric lithium disilicate (Li2Si2O5) based glass composition was studied. Different x amounts (x = 0, 1, 3 5 mol%) were added to (100 − x) parent (22.96Li2O–2.63K2O–2.63Al2O3–71.78SiO2) composition. glasses produced by conventional melt-quenching technique, whilst glass–ceramics via monolithic bulk glasses. A scanning electron microscopy (SEM) examination as cast non-annealed revealed precipitation nanosize droplet phase in glassy matrices suggesting occurrence liquid separation all investigated compositions. extent segregation, judged from mean diameter packing density droplets, decreased with increasing content slight depolymerisation network observed according magic angle spinning nuclear magnetic resonance (MAS-NMR) Fourier transform infrared (FTIR) spectroscopic studies, modifier for CaF2. presence enhanced at lower temperatures comparison CaF2-free glass.