期刊
SOLID STATE COMMUNICATIONS
卷 350, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ssc.2022.114758
关键词
Glass; Crystallizaion; Glass-ceramic; Microstructure
资金
- Science and Engineering Research Board (DST-SERB) [PDF/2016/003799]
- Central Laboratory of Hindustan Aeronautics Limited
This study investigates the effects of substituting K+ ion with Ca2+ or Sr2+ ion in K2O-SiO2-MgO-Al2O3-B2O3-MgF2-Li2O-AlPO4 glass, revealing that the presence of CaO or SrO decreases the density of the glass. Transparent glass monoliths and opaque glass-ceramics were obtained, with the predominant crystalline phase in the glass-ceramics identified as fluorophlogopite mica. The addition of CaO and SrO transformed the morphology of the mica crystals from plate-like to nanocrystalline with droplet-like spherical shapes.
The substitution of K+ ion by Ca2+ or Sr2+ in K2O-SiO2-MgO-Al2O3-B2O3-MgF2-Li2O-AlPO4 glass is executed and the relevant effects on crystallization and microstructure are explored. The glass monoliths obtained by single-step melt-quenching at 1500 +/- 10 degrees C were transparent in nature. Density of base glass was evaluated as 2.66 +/- 0.03 g cm(-3) and found to be decreased by in presence of CaO or SrO. Opaque glass-ceramics were derived from the transparent glasses by controlled heat-treatment at 1000 +/- 10 degrees C and the predominant crystalline phase was identified as fluorophlogopite mica, KMg3AlSi3O10F2 by X-ray diffraction. Field emission scanning electron microscopy revel that the plate like fluorophlogopite mica crystals predominated in base glass-ceramic (without CaO or SrO doped) but changed to nanocrystalline morphology containing droplet like spherical shaped mica crystallites (average size 200-400 nm) on addition of CaO and SrO. Highest density (=2.74 +/- 0.03 g.cm-3) observed for SrO containing glass-ceramic is attributed to the nanocrystalline morphology.
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