Performance investigation of Li2O-Al2O3-4SiO2 based glass-ceramics with B2O3, Na3AlF6 and Na2O fluxes

► Complex fluxes were investigated to improve LAS glass-ceramics temperature properties. ► Excess B2O3 causes severe spinodal decomposition and formation of Al3Si6.84BO18. ► Excess F− ions lead to uncontrollable crystallization, yet promote formation of needle crystals. ► Complex fluxes relieve adverse effects caused by excess B2O3 and F− ions. ► Sample crystallized completely under 800 °C could be further studied as bond of diamonds.