Abstract
The correlation between the formation of α-quartz and lithium silicate in NaBr-LiCl flux and NaBr-lithium compound (other than LiCl) fluxes and the vitrification of the sample was studied. In NaBr-LiCl flux at the soaking temperature of 800°C, α-quartz formed in the non-vitrified powdery part in larger quantities than in the vitrified part, while the situation was reversed for lithium silicate. In non-vitrified powdery part in range of R2 (silicagel/flux, molar ratio)≥0.10, only α-quartz crystals were formed. Use of NaBr-Li6Mo7O24 flux inhibited the vitrification almost completely, α-quartz crystals being maximum 8.9μm in length at R1 (NaBr/Li6Mo7O24, molar ratio)=9.97/0.03, and the formation of lithium silicate was suppressed in NaBr-Li3PO4 flux.
