Preparation and properties of transparent cordierite-based glass-ceramics with high crystallinity

Toward hard and highly crack resistant magnesium aluminosilicate glasses and transparent glass‐ceramics

“…Finally, for MgO-Al 2 O 3 -SiO 2 glass-ceramic with R = 0.32, which was obtained through heat treatment at 1283 K for various durations, the gradual enhancement of hardness following the increase in heat-treatment durations should be explained by considering the phase change during the crystallization process. First, confirmed by XRD patterns as shown in Figure 6, the crystal phase is MgO·Al 2 O 3 .4SiO 2 , which has a high hardness of approximately 8.0 GPa, 27,28 relatively higher than the original glass of 6.4 GPa shown in Figure 2. Second, following the nucleation and growth of MgO•Al 2 O 3 •4SiO 2 crystal phase, the residual glassy phase will have a high molar ratio R, that is, a higher content of Al.…”

P‐13.10: The Influence of Refractive Index of ITO Thin Film on CIE Coordinate in White Organic Light‐Emitting Diodes

“…Generally, for non-single crystalline materials, the higher the crystallinity is, the more grain boundaries is, the more serious the scattering of visible light is, and the worse the transparency is. Therefore, low crystallinity can increase transparency [4] . Consequently, intra grain boundary scattering phenomenon cannot be ignored [5] .…”

“…Meanwhile, the intensity of the scattered light is inversely proportional to the fourth power of the wavelength of the incident light. That is to say, the shorter the wavelength is, the stronger the scattering is and the lower the transmissivity is due to the Rayleigh scattering formula (2)(3)(4)(5).…”

Oriented growth of a β-quartz solid solution from a MgO–Al2O3–SiO2glass coated by a sol–gel ZrO2layer

“…5 In order to obtain glass-ceramics with advantageous mechanical properties such as a high fracture toughness or high bending strengths, crystalline phases with high coefficients of thermal expansion (CTE), such as the low temperature α-quartz solid solution (α-QSS), spinel and tetragonal ZrO 2 are favorable. 6,7 Up to now, the sole surface nucleation of a β-QSS (also denoted as μ-cordierite) and indialite (also denoted as α-cordierite) has been observed for glasses of this composition after crystallizing at temperatures from ca. However, glasses in the system MgO/Al 2 O 3 /SiO 2 show a strong tendency towards surface nucleation.…”

“…1 These phases show a much larger volume contraction during cooling than the residual glassy phase, resulting in high mechanical stress and good mechanical properties in the final material. 2,[6][7][8][9] Glasses of the stoichiometric cordierite composition have been intensively studied, including their recent analyses by EBSD, 10 as this is a model system for glass nucleation research. 6,7 Up to now, the sole surface nucleation of a β-QSS (also denoted as μ-cordierite) and indialite (also denoted as α-cordierite) has been observed for glasses of this composition after crystallizing at temperatures from ca.…”