These melts were quenched at room
temperature in air by pouring between the melt on a stainless steel
plate and pressing with another stainless steel plate. The quenched
glasses were annealed at 500 C for 3 h for reduce thermal stress,
and cool down to the room temperature. All glass samples were
cut and polish in proper shape for further studies. At the room temperature,
densities (q) of all glass samples were measured by
Archimedes’s method using xylene as an immersion liquid. The
density is calculated according to the formula