<![CDATA[The evidence of phase separation droplets in the crystallization process of a Li <ce:inf loc='post'>2</ce:inf>O-Al <ce:inf loc='post'>2</ce:inf>O <ce:inf loc='post'>3</ce:inf>-SiO <ce:inf loc='post'>2</ce:inf> glass with TiO <ce:inf loc='post'>2</ce:inf> as nucleating agent – An X-ray diffraction and (S)TEM-study supported by EDX-analysis]]>

Enrico Kleebusch; Christian Patzig; Thomas H?che; Christian Rüssel

首页> 外文期刊>CERAMICS INTERNATIONAL >2O-Al 2O 3-SiO 2 glass with TiO 2 as nucleating agent – An X-ray diffraction and (S)TEM-study supported by EDX-analysis]]>

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2O-Al 2O 3-SiO 2 glass with TiO 2 as nucleating agent – An X-ray diffraction and (S)TEM-study supported by EDX-analysis]]>

机译： O 3 -SIO 2 玻璃与TIO 2 作为成核剂 - EDX分析支持的X射线衍射和（S）TEM研究]]>

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Abstract

Lithiumalumosilicate glasses are of great importance for industrial applications, because they enable the preparation of glass ceramics with coefficients of thermal expansion close to zero. While detailed studies of the effect of ZrO2on nucleation and crystal growth have already been performed in recent years, the effect of TiO2was up to now not reported in detail. It is shown for the first time, that liquid/liquid phase separation is the initial step of nucleation in lithiumalumosilicate glasses containing TiO2. During temperature treatment above the glass transition temperature, at 740°C for 0.25–24h, in the formed droplets, TiO2nanocrystals precipitate. The formed phases were investigated by XRD- and TEM and STEM-EDX to illustrate the phase developments as well as the resulting microstructures and the local enrichments of the respective components as a function of time.

Longer crystallization times resulted in the formation of crystalline lithiumalumosilicate (LAS) with a high-quartz structure. These crystals are notably larger than the TiO2crystals and are growing with increasing treatment time and temperature. The evidence of anatase formation was obtained from high resolution TEM from the lattice spacings because it cannot be distinguished from the high quartz structure using XRD.

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机译：<！[cdata [ 抽象

锂酸锂硅胶眼镜对工业应用非常重要，因为它们使得玻璃陶瓷的制备具有接近零的热膨胀系数。虽然近年来已经进行了ZrO 2 对成核和晶体生长的影响的详细研究已经进行了TIO 2 现在没有详细报道。它首次示出，液/液相分离是含有TiO的锂锍玻璃中成核的初始步骤 2 。在高于玻璃化转变温度的温度处理期间，在740℃下，在形成的液滴中，TiO 2 纳米晶体沉淀物。通过XRD和TEM和STEM-EDX研究了形成的相，以说明相位发育以及所得的微观结构和各组分的局部富集作为时间的函数。更长的结晶时间导致具有高石英结构的结晶锂锍（LAS）。这些晶体特别大于TiO 2 晶体，并且随着治疗时间和温度的增加而生长。从晶格间距从高分辨率TEM获得锐钛矿形成的证据，因为它不能使用XRD与高石英结构区分开。 ]]>

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来源
《CERAMICS INTERNATIONAL》 |2018年第3期|共8页
作者
Enrico Kleebusch; Christian Patzig; Thomas H?che; Christian Rüssel;
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作者单位

Otto Schott Institut Jena University;

Fraunhofer Institute for Microstructure of Materials and Systems IMWS;

Fraunhofer Institute for Microstructure of Materials and Systems IMWS;

Otto Schott Institut Jena University;

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正文语种 eng
中图分类陶瓷工业;硅酸盐工业;
关键词
B: Electron microscopy; B: Microstructure-final; B: X-ray methods; D: TiO2; D: Glass ceramics; D: Glass;

机译：B：电子显微镜;B：微观结构 - 最终;B：X射线方法;D：TiO2;D：玻璃陶瓷;D：玻璃;

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2O-Al 2O 3-SiO 2 glass with TiO 2 as nucleating agent – An X-ray diffraction and (S)TEM-study supported by EDX-analysis]]>

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