STRUCTURE MODEL OF GLASSES FOR PbO-Bi₂O₃-B₂O₃ SYSTEM CONTAINING HIGHER B₂O₃

STRUCTURE MODEL OF GLASSES FOR PbO Bi 2O 3 B 2O 3 SYSTEM CONTAINING HIGHER B 2O 3

ＳＴＲＵＣＴＵＲＥＭＯＤＥＬＯＦＧＬＡＳＳＥＳＦＯＲＰｂＯＢｉ２Ｏ３Ｂ２Ｏ３ＳＹＳＴＥＭＣＯＮＴＡＩＮＩＮＧＨＩＧＨＥＲＢ２Ｏ３①ＬｕＡｎｘｉａｎ，ＨｕａｎｇＪｉｗｕ，ＬｕＲｅｎｗｅｉＤｅｐａｒｔｍｅｎｔｏｆＭａｔｅｒｉａｌｓＳｃｉｅｎｃｅａｎｄ...

The glasses of B 2O 3 contents above 50%(mole percent) in PbO Bi 2O 3 B 2O 3 system were prepared by conventional melt quenching technology. X ray, SEM and IR methods were used to examine the structural features of these glasses. The results of X ray diffraction analyses showed that the glass structure contains two kinds of matted crystals that related to the mole ratios of PbO versus Bi 2O 3 and to addition contents of B 2O 3. The compositions of the matted crystals with different mole ratios of PbO versus Bi 2O 3 ranged from 80∶20 to 20∶80 were determined. The analyses of IR showed that the structures of glasses with different mole ratios of PbO versus Bi 2O 3 contain different boron oxygen rings such as boroxol rings or triborate rings. A structural model based on the results above mentioned was presented.