Barium Gallogermanate Glass Ceramics for Infrared Applications

Bin Tang1,2),Yi Yang1,3),Youyu Fan1,2) and Long Zhang1) 1) Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China 2) Graduate School of Chinese Academy of Sciences,Beijing 100029,China 3) Luoyang Institute of Electro-optical Equipment of AVIC,Luoyang 471009,China

摘 要：The germanate glass ceramics is a potential candidate material for infrared（IR） dome and window applications.The crystallization mechanism of 20BaO-10Ga2O3-70GeO2 glass was investigated by differential thermal analysis（DTA）,scanning electron microscopy（SEM） and X-ray diffraction（XRD）.Two different types of phase evolution were found in the early stage of crystallization:（1） the further growth of the microcrystal formed during the slow cooling of glass melt and（2） the glass-in-glass phase separation.The controlled crystallization was obtained by two-step heat treatment.The middle infrared（MIR）-transparent glass ceramics were obtained,with expected thermal and mechanical improvements.

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