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首页> 外文期刊>Crystal growth & design >Temporal evolution of diffusion barriers surrounding ZrTiO _4 nuclei in lithia aluminosilicate glass-ceramics
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Temporal evolution of diffusion barriers surrounding ZrTiO _4 nuclei in lithia aluminosilicate glass-ceramics

机译：锂铝硅酸盐玻璃陶瓷中ZrTiO _4核周围扩散壁垒的时间演化

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摘要

Glasses are usually synthesized by quenching a melt rapidly enough to avoid crystallization. Nanocrystalline materials can subsequently be derived from glasses by controlled crystallization with applying a tailored heat treatment. Upon the latter, nucleation agents are widely used to adjust the desired nanostructures. Nano glass-ceramics often possess intriguing properties. For example, they can be ultratransparent; that is, they hardly scatter light or possess thermal expansion coefficients very close to zero. Such properties have a high potential for future applications in optical devices. In this paper, the role of zirconia and titania used as nucleation agents in a lithia aluminosilicate glass is studied on the nanoscale using cutting edge analytical and imaging techniques performed using the transmission electron microscope. Precipitation of ZrTiO _4 nanocrystals [Bhattacharyya, S., et al. Nano Lett. 2009, 9, 2493] was found earlier to be accompanied by the formation of a circumjacent diffusion barrier consisting of alumina. In addition to this, here we study the temporal evolution of the alumina barrier and the size distributions of ZrTiO _4 nanocrystals and lithia aluminosilicate high-quartz solid solution crystals promoted by the nucleation agent. In the light of these findings, the theory of self-limited growth is refined.
机译：通常通过足够快地淬灭熔体以避免结晶来合成玻璃。随后可以通过应用定制的热处理来控制结晶，从玻璃中衍生出纳米晶体材料。在后者上，成核剂被广泛用于调节所需的纳米结构。纳米玻璃陶瓷通常具有吸引人的特性。例如，它们可以是超透明的;也就是说，它们几乎不散射光或具有非常接近零的热膨胀系数。这样的特性对于光学设备的未来应用具有很高的潜力。在本文中，使用前沿电子分析技术和透射电子显微镜成像技术，在纳米尺度上研究了氧化锆和二氧化钛在锂铝硅酸盐玻璃中用作成核剂的作用。 ZrTiO _4纳米晶体的沉淀[Bhattacharyya，S.，et al。纳米莱特。 2009，9，2493]早先被发现伴随着由氧化铝组成的周围扩散阻挡层的形成。除此之外，在这里我们研究了成核剂促进的氧化铝势垒的时间演化以及ZrTiO_4纳米晶体和锂铝硅酸盐高石英固溶体晶体的尺寸分布。根据这些发现，完善了自我极限增长的理论。

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