Glasses and glass-ceramics in the oxyfluoride ternary system Pb(PO3)2-WO3-PbF2

► Simultaneous bulk crystallization at low temperature and surface crystallization at high temperature in lead-tungsten fluorophosphate glasses. ► Controlled crystallization of β-PbF2 nanosized crystallites and transparent glass-ceramics. ► Crystallization mechanisms probed by surface Raman microscopy.