NaF-Na_2O-B_2O_3系ガラスの高温ラマンスペクトル(セラミック材料小特集)

概要

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Raman spectra of NaF-Na_2O-B_2O_3 glasses with B_2O_3 content = 65, 80 and 85 mol% were measured from ambient to 800℃. T_g and T_d of the glasses were measured. The results are summarized as follows. (1) The Raman spectra of glasses in the NaF-B_2O_3 system are similar to those in the Na_2O-B_2O_3 system. The line width and the peak intenisity ratio of 770 cm^<-1> to 806 cm^<-1> I_<770>/I_<806> are almost same in both systems. (2) The peak positions of the Raman spectra shift toward lower frequency as temperature increases. (3) The line width increases as temperature increases. (4) The peak intensity ratio of 770 cm^<-1> to 806 cm^<-1> I_<770>/I_<806> increases slightly with increasing temperature. (5) T_g and T_d decrease as the NaF content increases. From the above mentioned results it is inferred that the similar structural units are present both in the NaF-B_2O_3 and the Na_2O-B_2O_3 systems, and these structural units are mostly maintained at elevated temperatures. However, some structural rearrangement is implied above T_g among the borate groups containing four-fold coordinated boron atoms. The differences in T_g and T_d between the two systems are attributed to the fluoline atoms connecting the borate groups.
社団法人日本材料学会の論文
1994-06-15