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Updated: Jul 26, 2025

$Stress Distribution During Cold Compression of Rocks and Mineral Aggregates Using Synchrotron-based X-Ray Diffraction$

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一个MHz的X射线衍射设置,用于在钻石天细胞中的动态压缩实验

Rachel J Husband¹, Cornelius Strohm¹, Karen Appel²

¹Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607 Hamburg, Germany.

Journal of synchrotron radiation

|June 15, 2023

概括

一个新的实验平台使MHz X射线衍射能够用于动态钻石天细胞研究. 这允许对快速压缩下的材料进行详细研究,揭示了对它们在极端条件下的行为的洞察.

科学领域:

凝聚物质物理学凝聚物质物理学
材料科学是一种材料科学.
高压物理学的高压物理

背景情况:

动态钻石细胞 (dDACs) 对于研究极端压力下的材料行为至关重要.
以前数据采集速度的限制阻碍了动态压缩过程的实时分析.

研究的目的:

开发和验证使用dDACs进行高重复率,脉冲分辨率X射线衍射的实验平台.
为了使材料在中等应变速率下 (高达10^3s^-1) 以史无前例的时间分辨率进行研究.

主要方法:

在欧洲X射线自由电子激光器 (欧洲XFEL) 中使用了高能量密度 (HED) 仪器,其MHz的重复率.
采用了能够在340微秒内进行样本压缩的压缩驱动dDAC,与XFEL脉冲列车同步.
每个脉冲列车收集了多达352个脉冲分辨率的X射线衍射图像.

主要成果:

从动态压缩样本收集MHz X射线衍射数据的成功演示.
在23 TPa/s的N2快速压缩过程中,达到高达~1100 s^-1的中间应变速率.
在Au的快速压缩过程中观察到的最大压缩速率为87 TPa/s.

结论:

开发的平台为研究材料中的动态压缩现象提供了强大的新能力.
这一进步为在短暂的高压条件下探索材料相位过渡和动力学开辟了道路.
该系统的多功能性允许研究具有不同X射线散射特性的多样样样本系统.

关键词:

在X射线自由电子激光器.钻石天细胞钻石天细胞动态压缩的动态压缩.极端条件科学科学极端条件科学

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