Abstract
The structure and changes occurring during the volume crystallization of a MgO-Al2O3-SiO2-TiO2 glass induced by heat-treatment at temperatures in the range 740 to 1300° C were investigated by means of DTA, scanning electron microscopy, X-ray diffraction, electron microprobe analysis, density and other measurements. Crystallization proceeds by liquid phase separation and coalescence of small particles forming larger microcrystalline regions dispersed in the glassy phase, these regions fill the bulk of the glass during the heat-treatment. Such a mechanism of crystallization leads to the formation of a fine-grained homogeneous structure whose chemical composition is identical to that of the glassy matrix (as is shown by the electron microprobe). The scanning electron microscope revealed two crystalline phases in the initial stage (850 to 890° C) of crystallization while X-ray diffraction identified only a μ-cordierite type structure, which at temperatures above 1100° C is transformed into the α-form. The X-ray diffraction patterns showed further that a cordierite 2MgO.2Al2O3.nSiO2 solid solution may be formed dependent on the heattreatment temperature. Stereoscan micrographs of various stages of crystallization show the development of the glass-ceramic. In addition, the influence of the technique employed to prepare the electron microscope specimens, on their surface topography is also shown.
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Zdaniewski, W. Crystallization and structure of a MgO-Al2O3-SiO2-TiO2 glass-ceramic. J Mater Sci 8, 192–202 (1973). https://doi.org/10.1007/BF00550667
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DOI: https://doi.org/10.1007/BF00550667