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将气枪与X-pinchX射线源相合,在冲击负载下进行X射线衍射

C Chauvin¹, D Palma de Barros¹, A Delaunay¹

¹CEA, DAM, Gramat, F-46500 Gramat, France.

The Review of scientific instruments

|April 18, 2025

概括

这项研究引入了一种实验室规模的X射线衍射方法,用于冲击载荷材料. 这种新技术成功地捕获了锡.

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
冲击物理冲击物理

背景情况:

在极端条件下研究晶体材料,如冲击负载,X射线衍射是至关重要的.
以前使用X射线衍射的冲击压缩研究仅限于大型设施.
调查冲击诱导的相位过渡需要精确的时间和空间分辨率.

研究的目的:

开发和验证实验室规模的X射线衍射技术,用于对冲击载荷材料的现场分析.
为了证明这种方法在观察动态相位转换方面的能力.
为了同步X射线发射与冲击波到达,以获得准确的数据.

主要方法:

将一个X-pinchX射线发电机与单阶段气枪相合,创建一个实验室规模的设置.
使用短 (低于100 ns) 多色X射线闪光灯以获得高时间分辨率.
在样本接口的反射中执行X射线衍射,以达到均的压力.
实现基于冲击波旅行时间的同步触发系统.

主要成果:

在X射线发射和冲击波到达之间成功实现了同步.
在现场X射线衍射模式的冲击负荷锡揭示了从β到γ阶段的固体-固体相位过渡.
观察到母相 (β-) 的消失和子相 (γ-) 衍射峰的出现.

结论:

开发的实验室规模的X射线衍射技术对于研究晶体材料中冲击诱导的相变是有效的.
该方法为动态材料分析的大型设施提供了可行的替代方案.
成功观察锡的β-γ相变验证了该技术的精度和同步能力.

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