The role of additives in a complex lithium silicate glass-ceramic

Abstract

Several glass-ceramic compositions based on lithium silicates have been examined using thermal expansivity, X-ray diffraction, electrical conductivity, electron microscopy and solid state NM R studies. Role of P20~ in nucleation and of AI2 O3 in smoothening expansion behaviour have been particularly highlighted. Magic angle spinning NMR has been used to ascertain presence of A1 in tetrahedral positions in the glassy phase.