【摘要】 研究了GeSe2-Ga2Se3-MX(M=Cs,K,X=I,Br,Cl)系玻璃的形成和性能。研究表明,这些系统均具有较大的玻璃形成区,其中,GeSe2-Ga2Se3-CsI系统的成玻能力和热稳定性最佳。随碱金属卤化物含量的增加,GeSe2-Ga2Se3-MX玻璃的短波吸收限逐渐蓝移至可见光区(可至550 nm以下),长波截止边无明显变化,部分玻璃在0.6~16μm范围内具有良好的透过率。玻璃的转变温度Tg、显微硬度Hv、断裂韧性K1c和弹性模量E随卤化物的含量增加而减小,而膨胀系数α增大。研究发现,该系统玻璃随热处理温度的提高,首先发生滴状分相,随后在滴状分相区内产生析晶。通过采取合适的热处理制度,研制获得了具有较好的K1c和红外透光性的微晶玻璃。研究结果表明,GeSe2-Ga2Se3-MX硫卤玻璃和玻璃陶瓷是一种具有应用前途的全波段透射和红外透射材料。更多还原

【Abstract】 The formation and properties of GeSe2-Ga2Se3-MX(M=Cs,K,X=I,Br,Cl)chalcohalide glasses were investigated.Many of the glasses have relatively large glass-forming domains,among them,GeSe2-Ga2Se3-CsI system has best glass-forming ability and thermal stability.With increasing content of the alkali halide,the short-wavelength absorption edge of GeSe2-Ga2Se3-MX glass had a blue shift and gradually shifted into the visible-light region(even less than 550 nm),and the long-wavelength cut-off edge almost kept unchanged at around 16 μm.Some of the glasses had good transparency in the entire 0.6-16 μm.The Tg,microhardness Hv,fracture toughness K1c,elastic modulus E of the glasses gradually decreased but expansion efficiency α increased.The glass-ceramic process was realized through the controlled crystallization caused by phase separation.Compared with the parent glass,the fabricated glass-ceramics shew considerably enhanced K1c,practicable infrared transparence.These results indicate that GeSe2-Ga2Se3-MX chalcohalide glasses and glass-ceramics are attractive materials for visible-IR and IR transmitting optics.更多还原