Kinetics of the Ostwald ripening in lithium aluminosilicate glasses containing TiO2 and ZrO2
Kinetics of the Ostwald ripening in lithium aluminosilicate glasses containing TiO2 and ZrO2
复制标题
含 TiO2 和 ZrO2 的锂铝硅酸盐玻璃中奥斯特瓦尔德熟化动力学
DOI：
10.1007/bf02731942
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发表时间：
2000
影响因子：
0.7
通讯作者：
T. I. Chuvaeva
中科院分区：
文献类型：
--
作者：
V. Golubkov;O. Dymshits;A. Zhilin;T. I. Chuvaeva
对含有氧化钛或钛和锆的氧化物的锂铝硅酸盐玻璃进行了结构研究。通过小角X射线散射（SAXS）技术研究了预先加热到获得稳定两相结构（催化剂相）的玻璃在温度升高后观察到的奥斯特瓦尔德熟化过程中的结构转变。在所有情况下，温度升高都会导致稳定性丧失以及在较低温度下沉淀的相部分溶解。含有TiO₂和ZrO₂的锂铝硅酸盐玻璃在低温（660°C）热处理时会析出铝钛酸盐相，经过5000 - 6000小时的长时间热处理后达到稳定状态。随着温度升高，该相变得不稳定，导致其溶解并析出一种含有钛和锆的氧化物的新相，呈钛酸锆微晶形式。含有TiO₂和ZrO₂的玻璃在等温处理过程中奥斯特瓦尔德熟化过程中的相组成变化与涉及钛或锆离子的结构单元的不同迁移率有关。
A structural investigation is undertaken on lithium aluminosilicate glasses containing a titanium oxide or titanium and zirconium oxides. The structural transformations in the course of Ostwald ripening observed after the increase in temperature of the glasses preliminarily heat-heated to the attainment of a stable two-phase structure (catalyst phase) are studied by the small-angle X-ray scattering (SAXS) technique. In all the cases, an increase in temperature leads to the loss of stability and a partial dissolution of the phase precipitated at a lower temperature. The low-temperature heat treatment (660°C) of lithium aluminosilicate glasses containing TiO2 and ZrO2 brings about the precipitation of aluminotitanate phase that reaches the stable state upon prolonged heat treatments for 5000–6000 h. As the temperature increases, this phase becomes unstable, which results in its dissolution and the precipitation of a new phase containing titanium and zirconium oxides in the form of zirconium titanate microcrystals. Changes in the phase composition in the course of Ostwald ripening upon isothermal treatments of glasses containing TiO2 and ZrO2 are associated with different mobilities of structural elements involving titanium or zirconium ions.