MgO-Al2O3-SiO2微晶玻璃的IR、DTA和XRD研究

利用红外光谱、差热分析、Ｘ射线粉末衍射、电子显微镜等手段研究了含有ＴｉＯ_２和ＺｒＯ_２的薹青石微晶玻璃的分相、成核与析晶过程．热处理过程中玻璃首先发生分相，富含钛离子的一相呈现点滴状，均匀分散于玻璃基体中．随后玻璃中析出大量微小的镁铝钛酸盐晶粒，并保持与玻璃分相类似的显微结构形貌．在玻璃析晶过程中钛离子逐渐向六配位状态转化，表明玻璃中钛离子参与形成晶相，玻璃相中钛离子含量逐渐减少．

IR, DTA and XRD Study of MgO-Al2O3-SiO2 Glass-Ceramic

The processes of the phase-separation, nucleation and crystallization of the MgO-Al₂O₃-SiO₂ glass containing TiO₂ and ZrO₂ were studied by the methods of infrared spectra, differential thermal analysis, X-ray powder diffraction, and electric microscopy. Phase-separation was found first during the heat treatment of the glass. The phase like drops contained more Ti element and surrounded by other phases. The analogous structure was remained during the nucleation process. Titanium ions were found to be of six-coordination, which accounted for the crystallization of the crystals containing titanium element.