Aluminium metaphosphate glass-ceramics

Crystallization and microstructure of Eu3+-doped lithium aluminophosphate glass

“…The presence of lithium barium phosphate, Li 3 Ba 2 (PO 3 ) 7 , was identified in the glass sample treated at 823 K, but it was not detected in the glass sample treated at 923 K, where barium pyrophosphate, Ba 2 P 2 O 7 , was identified. It has been verified that the crystallization of aluminophosphate based glasses containing different compounds (e.g., Li 2 O, Na 2 O) yields frequently aluminum metaphosphate and aluminum phosphate, which is present as a secondary phase [8,29]. Langlet et al [29] reported that cubic aluminum metaphosphate is the only form stable at high temperature among the five known Al(P0 3 ) 3 species, and they identified the formation of two forms of AlPO 4 , resulting from P 2 0 5 loss during the melting process and that was formed at the surface of the glass samples.…”