摘要
采用不同熔化方法制备了铝酸钙红外玻璃并考察了其红外透过性能。研究了结构中的羟基对玻璃红外透过性能的影响。通过红外光谱和固体核磁共振技术对玻璃中羟基的结构特征、氢键结合状态以及红外吸收情况进行了研究和探讨。结果表明:羟基会引起铝酸钙玻璃在近红外2.9μm左右的宽带吸收,这是由于玻璃中羟基结构形式的多样化所造成的;在玻璃结构中,羟基与氢键结合会造成振动频率下降,红外吸收峰向长波移动,羟基氢键结合强度越大,长波移动越严重,羟基与氢键结合形式越多,羟基的红外吸收范围越宽;在铝酸钙红外玻璃中主要存在3种羟基存在形式:孤立羟基基团、邻近的羟基对和带有氢键的单个羟基。不同制备方法获得的玻璃结构中羟基存在形式基本相同。
The effect of hydroxyl (OH) groups on the infrared (IR) transmittance of calcium aluminate glasses fabricated by deferent melting methods was investigated. The structural characterization, hydrogen bonding types and IR absorption of OH groups were analyzed via infrared spectroscopy (IR) and magic angle spinning nuclear magnetic resonance spectroscopy. The results show that a broadband absorption at 2.9μm appears due to the presence of the OH groups in the calcium aluminate glass network. The association of OH and hydrogen bond decreases the OH scratching frequency, causing the movement of IR absorption peaks to the long wavelength. Also, the IR absorption peaks increases with increasing the association strength. The more the hydrogen bonding, the broader range of OH absorption will be. There are three types of OH groups in calcium aluminate glasses, i.e., isolate OH groups, neighbor OH pairs and single OH groups with hydrogen bonding. The OH structures of calcium aluminate glasses fabricated by deferent melting methods are basically similar.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2015年第2期201-204,共4页
Journal of The Chinese Ceramic Society
关键词
铝酸钙红外玻璃
红外透过
羟基
结构特征
calcium aluminate glass
infrared transmitting
hydroxyl
structure characterization
