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.

氧化物眼镜在我们周围的世界上无处不在，并用于窗玻璃，激光材料和电子行业中使用的底物的各种应用中。尽管采用了许多应用，但令人惊讶的是，这些材料中的某些材料中的某些材料中的某些应用真是太糟糕了。最近，由氧化铝混合物与其他金属氧化物（金属铝制）产生的高温玻璃显示出了新颖有趣的物理现象。这是一种状态的产生，在该状态下，相同材料的两个液相可以在相同温度（所谓的液体液相变过）和多态玻璃（即在室温下产生两个混合玻璃）在同一温度下共存。液态液体过渡特别具有挑战性（也预计在纯水中存在），理论上难以理解。这项工作的目的是向这一新的一种令人惊讶的行为投入新的启示。光学特性，尤其是稀土铝制的发光也很感兴趣用于下一代显示器或用作激光的材料。但是，这些眼镜的发光效率很大程度上取决于产生玻璃的方式。这项工作的第二个目的是了解这些眼镜中活性离子周围的局部结构如何根据其热历史而变化，以及与其性质有关。最后，玻璃过渡本身仍然是凝结物理学中最鲜为人知的势头之一。在这些铝制玻璃中观察到的玻璃化的时间标准使它们成为了通过结构测量（衍射）和松弛测量（非弹性散射）从超冷液体中研究玻璃形成的良好材料。我们打算应用这些方法，以更好地理解这些液体中玻璃形成，相分离和结晶的特性。