Li_2O/K_2O物质的量比对P_2O_5-Al_2O_3-BaO-Li_2O-K_2O磷酸盐玻璃热光性能的影响  

Effect of Different Li_2O/K_2O Ratio on the Thermo-optical Properties of Phosphate Glass with P_2O_5-Al_2O_3-BaO-Li_2O-K_2O

作　　者：张礼华[1,2] 张云升[1] 殷倩文 ZHANG Lihua;ZHANG Yunsheng;YIN Qianwen(School of Materials Science and Engineering,Southeast University,Nanjing 211189;School of Materials Science and Engineering,Southwest University of Science ＆Technology,Mianyang 621010;Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800)

机构地区：[1]东南大学材料科学与工程学院,南京211189 [2]西南科技大学材料科学与工程学院,绵阳621010 [3]中国科学院上海光学精密机械研究所,上海201800

出　　处：《材料导报》2018年第12期1955-1958,共4页Materials Reports

摘　　要：通过高温熔融法制备了不同Li_2O/K_2O物质的量比的磷酸盐玻璃,研究了其热学性能和热光性能。采用干涉仪法测试了玻璃的折射率温度系数dn/dT,并进一步计算获得了热光系数。结果表明:随着Li_2O/K_2O物质的量比的增大,玻璃的转变温度Tg、软化温度Tf、热膨胀系数α皆出现极值点,呈现明显的混合碱效应;而玻璃的热光系数dS/dT随着Li_2O含量增加而增大,当Li_2O/K_2O物质的量比为9∶6时,玻璃的dS/dT为0.08×10^(-6)/K;在磷酸盐体系中可获得具有零热畸变的光学玻璃。Phosphate glasses with various Li2O/K2O ratios were synthesized using the melt quenching technique.The thermooptical properties of the glasses were studied.The temperature coefficients of refractive index（dn/dT）of the glasses were measured using interferometric technique and the thermo-optical coefficients were calculated.The results showed that with the increasing of Li2O/K2O ratios,mixed alkali effect could be observed on the glass transition temperature（Tg）,softening temperature（Tf）and thermal expansion coefficient（α）.Meanwhile,the thermo-optical coefficient（dS/dT）increased monotonously with the increase of Li2O content.The optimized value of thermo-optical coefficient with 0.08×10^-6/K was obtained with Li2O/K2O ratio at 9∶6.Results show that a phosphate glass with zero thermal distortion can be obtained.

关 键 词：混合碱效应 磷酸盐玻璃 热学性能 热光性能 零热畸变 

分 类 号：TQ171[化学工程—玻璃工业]