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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| [4] | D.C. Harris: SPIE Tutorial Texts Serires, VOL. TT10, SPIE Optical Engineering Press, Bellingham, WA, 1992.[2] P.L. Higby and I.D. Aggarwal: J. Non-Cryst. Solids, 1993, 163, 303. [3]P.W. McMillan: Glass-Ceramics, Academic Press, London, 1964.[4]W. HÄ |
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