P2O5-BaO-Nb2O5三元系统玻璃的形成及性能的研究

研究P2O5－BaO-Nb2O5三元系统的玻璃形成区，给出了该三元系统玻璃形成范围。结果发现该系统在网络形成体P2O5的摩尔分数仅为20％，Nb2O5的摩尔分数为30％，BaO的摩尔分数为50％的成分点仍成玻璃。讨论了Nb2O5在系数中的作用以及部分玻璃的着色问题。熔制了BaO的摩尔分数恒定为50％的（50－x)P2O5-xNb2O5-50BaO(x=0,1,10,25,30)和Nb2O5的摩尔分数恒定为10％的yP2O5-10Nb2O5-(90-y)BaO(y=40,50,60,70)玻璃。测定了其折射率、Abbe数、非线性折射率、转变温度、析晶温度、熔化温度、氧原子摩尔体积及密度和组成之间的关系，并从红外吸收光谱的结果初步探讨该玻璃结构。认为在该系统中Nb2O5的作用介于网络形成体和中间体之间。玻璃着色的原因是Nb^5 被还原。

FORMATION AND PROPERTIES OF GLASS IN TERNARY P2O5-BaO-Nb2O5 SYSTEM

The ternary P 2O 5-BaO-Nb 2O 5 glass was synthesized and formation range of glass of P 2O 5-BaO-P 2O 5 system was investigated. It is found in this ternary system glass can be formed even when the network former P 2O 5 is 20%. The effects of Nb 2O 5 on glass formation and colouring of glass are discussed. The (50- x )P 2O 5- x Nb 2O 5-50BaO( x =0,1,10,25,30) and y P 2O 5-10Nb 2O 5-(90- y )BaO( y =40,50,60,70) glass were prepared. The relations among glass composition, physical properties (such as refractive index, density etc.) and thermal stability were studied. The glass structures also preliminarily researched through analysis of their infrared spectra. It is considered that Nb 2O 5 is an intermediate oxide, and colouring of glass is affected by the valence of niobium.