Lead-gallium glasses and glass-ceramics doped with SiO2 for near infrared transmittance

摘要

Lead-gallium glasses, due to the absence of typical glass-forming components, are characterized by an increased tendency to crystallization. Despite this, they are interesting materials due to a shift of IR absorption edge up to 6-7 mu m. The paper considers how the SiO2 dopant affects thermal stability and the UV-VIS and IR transmittance of lead-gallium glasses. The base lead-gallium glass (0.75PbO.0.25Ga(2)O(3)) was modified by the addition of 5, 10 and 15 mol% SiO2, respectively. DTAIDSC data showed that the glasses are characterized by the multi-stage crystallization, which is changed with the amount of silica doped. The XRD analysis confirmed that: (i) different forms of lead oxide crystalliie after heat treatment of the glass, and (ii) the Ga2PbO4 phase is formed at higher temperatures.