(中南大學(xué) 材料科學(xué)與工程學(xué)院，長沙 410083)
摘 要:
以CCl4為除水劑，采用爐料浸泡處理工藝制備40GeO2-30SiO2-12Al2O3-6BaO-6CaO-6MgO光學(xué)玻璃，研究該工藝對鍺酸鹽玻璃的紅外透過性能以及析晶行為的影響。結(jié)果表明，鍺酸鹽玻璃中OH吸收峰位于3 338 /cm (3.0 μm)附近，通過Gauss分解將其分解為5個單峰并分別對其進(jìn)行分析，認(rèn)為鍺酸鹽玻璃中羥基振動頻率的紅移是由氫鍵強(qiáng)度變?nèi)跻鸬摹＜t外光譜分析表明，采用普通工藝制備的鍺酸鹽玻璃OH吸收系數(shù)為1.71 /cm，而處理后玻璃OH吸收系數(shù)減少至0.25 /cm。對樣品的DTA與XRD分析表明，采用新工藝制備的玻璃中由于殘留氯離子的存在，起到成核劑的作用，降低玻璃的析晶溫度，提高玻璃的析晶速率。氯化物的引入使得玻璃中晶粒形貌由島狀轉(zhuǎn)變?yōu)榘鍫睿岣卟ＡУ奈鼍С潭取?/SPAN>
關(guān)鍵字: 鍺酸鹽玻璃；紅外透過率；析晶行為；OH吸收；爐料浸泡工藝
（School of Materials Science and Engineering, Central South University, Changsha 410083, China）
Abstract:40GeO2-30SiO2-12Al2O3-6BaO-6CaO-6MgO glass was prepared by using batch soaking process with CCl4 as dehydration agent. The influence of this process on the infrared transmittance and crystallization behavior of the germanium glass was investigated. The results show that the infrared spectra contains a single band at approximately 3 338 /cm for the germanate glass. This broad absorption band is deconvoluted into five bands and some possible reasons for each band have been given. The absorption coefficient of hydroxyl in the germanate glass prepared by conventional melt quenching technique is 1.71 /cm while that of the one prepared by batch soaking process in CCl4 is 0.25 /cm. The analyses of DTA and XRD indicate that the glass prepared by batch soaking process crystallizes at lower temperature and has bigger crystallization rate for the residual chlorine acting as a nucleation agent in the interspaces of the glass network structure. The SEM images show that the residual chlorine promotes the formation of crystallite and changes the shape of the crystallite cluster.
Key words: germanate glass; infrared transmittance; crystallization; OH absorption; batch soaking process
