B_2O_3-Na_2O-V_2O_5玻璃紫外吸收截止波长和密度关系的研究

Research on Relationship Between UV Cutoff Wavelength and Density of B_2O_3-Na_2O-V_2O_5 Glasses

以硼酸、无水碳酸钠和五氧化二钒为原料，通过熔融-石墨模成形法制备（70-x）B2O3-30Na2O—xV2O5三元硼酸盐玻璃，其中x=1％～10％（摩尔分数）。经过研磨和抛光制成尺寸为30mm×30mm×2mm的玻璃样品。采用阿基米德原理法测定样品的密度，采用紫外／可见分光光度计测定样品的吸收光谱。结果表明，玻璃的密度d与玻璃紫外吸收截止波长入呈线性关系。当截止吸收波长小于或等于390nm时，二者符合方程入=2222．0d-4794．8；当截止吸收波长大于390nm时，二者符合方程入=1100．5d-2181．9。

Boric acid, anhydrous sodium carbonate and vanadium pentoxide were taken as start- ing materials, and ternary borate glasses（70 -x）B203 -30Na20 -xV205 were prepared by melting and forming in graphite model, where x = 1% - 10 mol%. Glass samples with size of 30 mm x 30 mm x 2 mm were obtained by grinding and polishing. The sample densities were meas- ured with Archimedes principle. UV absorbance spectra were determined by UV/Vis spectro- photometer. The linear relationship between the glass density d and UV absorbance cutoff wave- length k was shown： when λ≤390nm,λ = 2222.0 d -4794.8 ; when λ 〉390nm,λ = 1100.5 d -2181.9.