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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >The effects of a Li2O excess on the crystallization sequence of lithium aluminosilicate glass powders
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The effects of a Li2O excess on the crystallization sequence of lithium aluminosilicate glass powders

机译：Li2o过量对铝硅酸锂玻璃粉末结晶序列的影响

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摘要

The surface crystallization of melt-quenched lithium aluminosilicate (LAS) glasses with SiO2-contents between 77 and 79 mol% was investigated by high-temperature X-ray diffractometry. Glasses possessing a ratio Li/Al > 1 underwent far earlier crystallization (starting from 750?C) than their stoichiometric counterparts, developing solely quartz solid solution (Qss) and keatite solid solution (Kss) crystals during a heat treatment up to 1200?C. In turn, samples with Li/Al = 1 devitrified only above 900?C and exhibited the transient formation of cristobalite, whose lattice constants hint at a slight Li+Al stuffing. The composition, structural parameters and critical inversion temperature Tc of the obtained Qss crystals were analyzed and compared with the available literature sources, reaffirming the established mutually linear dependence between these properties.
机译：用高温X射线衍射法研究了SiO2含量在77～79mol%之间的熔融淬火铝硅酸锂（LAS）玻璃的表面结晶。与化学计量比的玻璃相比，Li/Al比大于1的玻璃经历了更早的结晶（从750°C开始），在高达1200°C的热处理过程中，仅形成石英固溶体（Qss）和基性石固溶体（Kss）晶体？C.反过来，Li/Al=1的样品仅在900℃以上脱氮化？并显示出方石英的瞬时形成，其晶格常数暗示有轻微的Li+Al填充。对所得Qss晶体的成分、结构参数和临界反转温度Tc进行了分析，并与现有文献资料进行了比较，重申了这些性质之间已建立的相互线性关系。

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