studies related to crystallization of germinate glasses Ⅰ. Phase relations in the system PbO-GeO2

摘要

Phase relations in the system Pb0=Ge02 have been determined using the quenching technique. Five compounds were detected with compositions as follows: 4Pb0°Ge02, 3Pb0°2Ge02, Pb0°Ge02°,Pb0°2Ge02, and Pb0°4Gs02. The 3:2 and 1:1 compounds melt congruently at 744 and 799°C respectively. The 4:1 compound melts incongruently at 726°C to Pb0 plus liquid, whereas the 1:4 compounds melts incongruently to Ge02 plus liquid at 790°C. The 1:2 compounds has a very narrow temperature range of stability between 707 and 730°C.