论文标题
合金中的可调相关障碍
Tuneable Correlated Disorder in Alloys
论文作者
论文摘要
了解混乱的作用及其中存在的相关性是当代材料科学中的定义挑战之一。但是，几乎没有其他复杂相互作用的物质系统，可用于系统地研究晶体学冲突对相关疾病的影响。在这里，我们报告了在外上执行稳定的合金$ \ mbox {u} _ {1-x} \ mbox {Mo} _x $上的广泛弥漫性X射线散射研究，表明，在结晶基础上的首选对称性和lattice sypered sypected of lattice sypered''中，这是一种本质上可调的相关性障碍形式的新形式。此外，结合放牧的发病率非弹性X射线散射和最新的分子动力学模拟，我们发现了强障碍偶联。与单独合金相比，这打破了全球对称性，并极大地抑制了语音子量，这为声子工程提供了其他设计策略。这些发现可以容纳晶体学冲突的任何含义，并且可以在未来功能材料的开发中得到利用。
Understanding the role of disorder and the correlations that exist within it, is one of the defining challenges in contemporary materials science. However, there are few material systems, devoid of other complex interactions, which can be used to systematically study the effects of crystallographic conflict on correlated disorder. Here, we report extensive diffuse x-ray scattering studies on the epitaxially stabilised alloy $\mbox{U}_{1-x}\mbox{Mo}_x$, showing that a new form of intrinsically tuneable correlated disorder arises from a mismatch between the preferred symmetry of a crystallographic basis and the lattice upon which it is arranged. Furthermore, combining grazing incidence inelastic x-ray scattering and state-of-the-art ab initio molecular dynamics simulations we discover strong disorder-phonon coupling. This breaks global symmetry and dramatically suppresses phonon-lifetimes compared to alloying alone, providing an additional design strategy for phonon engineering. These findings have implications wherever crystallographic conflict can be accommodated and may be exploited in the development of future functional materials.
