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Neutron and X-ray studies of the structure and relaxation in high temperature levitated liquids and glasses.

高温悬浮液体和玻璃的结构和弛豫的中子和 X 射线研究。

基本信息

批准号：
EP/F021488/1
负责人：
Adrian Barnes
金额：
$ 15.75万
依托单位：
University of Bristol
依托单位国家：
英国
项目类别：
Research Grant
财政年份：
2008
资助国家：
英国
起止时间：
2008 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=EP%2FF021488%2F1
关键词：
Neutron ray studies structure relaxation

项目摘要

Oxide glasses are ubiquitous in the world around us and are used in a wide variety of applications from window glass, laser materials and the substrates used in the electronics industry. Despite this multitude of applications it is surprising how poorly some of these materials are really understood. Recently, high temperature glasses produced from mixtures of Aluminium Oxide with other Metal oxides (metal aluminates) have revealed new and interesting physical phenomema. This is notably the production of a state where two liquid phases of the same material can co-exist at the same temperature (the so-called liquid-liquid phase transition) and the production of poly-amorphic glasses (i.e. the production of two intermixed glasses at room temperature) from this state. The liquid-liquid transition is particularly challenging to observe (it has also been predicted to exist in pure water) and theoretically difficult to understand. An aim of this work is to throw new light on this new a surprising behaviour. The optical properties and in particular, luminescence from rare-earth aluminates are also of interest either for use in next generation displays or as materials for lasers. However, the efficiency of the luminescence of these glasses is strongly dependent on the way in which the glasses are produced. A second aim of this work is to understand how the local structure around the active ion in these glasses changes according to its thermal history and how this can be related to its properties. Finally, the glass transition itself remains one of the most poorly understood phenmomena in condensed matter physics. The timescales for vitrification observed in these aluminate glasses make them good materials in which to study the glass formation from the supercooled liquid by both structure measurements (diffraction) and relaxation measurements (inelastic scattering). We intend to apply these methods to understand better the properties that give rise to glass formation, phase separation and crystallization in these liquids.

氧化物玻璃在我们周围的世界中无处不在，并用于各种各样的应用，从窗口玻璃，激光材料和电子工业中使用的基板。尽管有这么多的应用，但令人惊讶的是，人们对其中一些材料的真正理解是多么的贫乏。最近，由氧化铝与其他金属氧化物（金属铝酸盐）的混合物生产的高温玻璃揭示了新的和有趣的物理现象。值得注意的是，这是相同材料的两种液相可以在相同温度下共存的状态的产生（所谓的液-液相转变）以及从该状态产生多晶玻璃（即，在室温下产生两种混合的玻璃）。液-液转变的观察特别具有挑战性（它也被预测存在于纯水中），理论上很难理解。这项工作的目的之一是为这种令人惊讶的新行为提供新的线索。稀土铝酸盐的光学特性，特别是发光特性，无论是用于下一代显示器还是作为激光器的材料，都令人感兴趣。然而，这些玻璃的发光效率在很大程度上取决于玻璃的生产方式。这项工作的第二个目的是了解这些玻璃中活性离子周围的局部结构如何根据其热历史而变化，以及这如何与其性质相关。最后，玻璃化转变本身仍然是凝聚态物理学中理解最少的现象之一。在这些铝酸盐玻璃中观察到的玻璃化的时间尺度使它们成为通过结构测量（衍射）和弛豫测量（非弹性散射）来研究从过冷液体形成玻璃的良好材料。我们打算应用这些方法来更好地了解这些液体中引起玻璃形成、相分离和结晶的性质。