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揭示了基于PD的金属玻璃中的动态多样性的结构起源

Tianding Xu¹, Xiao-Dong Wang¹, Eric M Dufresne²

¹International Center for New-Structured Materials (ICNSM), Laboratory of New-Structured Materials, State Key Laboratory of Silicon Materials, and School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, P. R. China.

Small (Weinheim an der Bergstrasse, Germany)

|January 12, 2024

概括

金属眼镜表现出复杂的β-放松动态. 这项研究揭示了Pd─Cu─P金属眼镜中的铜原子移动性如何驱动明显的放松,而Pd─Ni─P金属眼镜中的原子约束则削弱了它.

科学领域:

材料科学材料科学材料科学
凝聚物质物理学凝聚物质物理学
无形材料是无形的材料.

背景情况:

β-放松是金属玻璃 (MGs) 中的一个关键动态行为,但它的结构起源仍然不太清楚.
了解β放松对于预测MG系统的整体动态和衰老行为至关重要.
以前的研究还没有完全阐明在不同的MG成分中观察到的独特动态特征.

研究的目的:

为了研究两种基于的金属玻璃中的明显β放松行为:Pd─Cu─P和Pd─Ni─P.
阐明导致不同动态特征的基础结构起源.
将原子动力学与微观结构相关联,以了解无序材料中的衰老现象.

主要方法:

使用先进的X射线光子相关谱 (XPCS) 和X射线吸收细结构 (XAFS) 技术.
执行第一原则计算,以补充实验发现.
在金属玻璃样本中分析了原子移动性和局部结构环境.

主要成果:

Pd─Cu─P金属玻璃表现出明显的β-放松和快速的原子动态,这归因于高铜原子的移动性和局部偏好的结构.
Pd─Ni─P金属玻璃显示弱化的β-放松和缓慢的动力学,由于原子运动受到原子的约束.
在原子动力学和微观结构特征之间建立了明确的相关性.

结论:

构成原子的移动性 (Cu vs. Ni) 和它们与网络形成原子 (P) 的相互作用决定了这些金属玻璃中的β放松行为.
这项研究提供了对金属玻璃中各种动态行为的结构起源的基本理解.
通过将动态与结构联系起来,这些发现提供了对无序材料衰老的性质的见解.

关键词:

在X射线吸收细结构上.在X射线光子相关性光谱学的X射线光子相关性光谱学.第一个原则是计算计算.金属玻璃玻璃的金属玻璃这是一种β-放松.

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