B2O3—La2O3—BaO—Nb2O5系统的玻璃生成范围及其性质

本文研究了在B₂O₃-La₂O₃-BaO-Nb₂O₅四元系统中当B₂O₃含量分别为25、30、35wt%时,该系统的玻璃生成范围和它们的光性、密度等变化规律。结果表明,随着B₂O₃含量的增加,系统的玻璃生成范围向贫Nb₂O₅边界扩充,富Nb₂O₅边表现收缩。工作中得出了该系统分别以SiO₂代B₂O₃、Al₂O₃代BaO后的析晶、折射率、色散及密度等性质的变化规律。最后应用该系统研制定型了713/538玻璃。

Glass Forming Region and Properties of Glasses in System B2O3-La2O3-BaO-Nb2O5

In this paper, glass forming region in quaternary system B₂O₃—La₂O₃—BaO—Nb₂O₅ is determined when composition of B₂O₃ is 25,30. and 35wt% respectivelly. The refractive index dispersion and density of the glasses in the system were measured. Experimental results indicated that the glass forming region was shifted to poor—Nb₂O₅ region with increasing of composition of B₂O₃. The vaoriting law of crystallizing, refractive index, dispersion and density of the glasses are discussed when SiO₂and Al₂O₃ is substituted for B₂O₃ and BaO respectivelly. New optical glass La K713/538 has been developed on the basis of this work.