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Behavior of the refractive index of lithium disilicate glass ceramic processed at high pressure and high temperature

机译：高压高温处理的二硅酸锂玻璃陶瓷的折射率行为

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摘要

The aim of this work was to investigate the effect of high pressure and high temperature on the refractive index of lithium disilicate glass ceramic with the stoichiometric composition Li_2O-2SiO_2 (LS_2). A first group of monolithic LS_2 glass samples were processed at 2.5 GPa, 4 GPa and 7.7 GPa at room temperature and a second group was submitted to high pressure and, simultaneously, to heat treatments for nucle-ation and growth of the crystalline phases. For comparison, samples submitted to the same heat treatments at 1 atm were also investigated. The refractive index of the samples was obtained by spectral ellipsometry and the results were clearly dependent on the particular pressure and temperature conditions. The crystallization of the samples was investigated by X-ray diffraction. For the samples processed under high temperature at 1 atm and at 2.5 GPa a fraction of the originally amorphous glass was transformed to a monoclinic phase of lithium disilicate. For the samples processed under high temperature and at 4 GPa, a large fraction of the originally amorphous glass transformed to an orthorhombic phase while, at 7.7 GPa, it was observed the formation of lithium metasilicate.
机译：这项工作的目的是研究高压和高温对化学计量组成为Li_2O-2SiO_2（LS_2）的二硅酸锂玻璃陶瓷折射率的影响。第一组整体式LS_2玻璃样品在室温下以2.5 GPa，4 GPa和7.7 GPa进行处理，第二组进行高压处理，并同时进行热处理，以进行晶核化和结晶相的生长。为了进行比较，还研究了在1个大气压下进行相同热处理的样品。样品的折射率是通过光谱椭圆仪获得的，结果显然取决于特定的压力和温度条件。通过X射线衍射研究样品的结晶。对于在1 atm和2.5 GPa的高温下处理的样品，一部分原始的非晶态玻璃转化为二硅酸锂的单斜晶相。对于在高温和4 GPa下处理的样品，大部分原始非晶态玻璃转变为正交晶相，而在7.7 GPa下，观察到形成了偏硅酸锂。

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