Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, MD, USA.
J Synchrotron Radiat. 2011 May;18(Pt 3):464-74. doi: 10.1107/S0909049511002640. Epub 2011 Mar 16.
A pair of techniques have been developed for performing time-resolved X-ray microdiffraction on irreversible phase transformations. In one technique capillary optics are used to focus a high-flux broad-spectrum X-ray beam to a 60 µm spot size and a fast pixel array detector is used to achieve temporal resolution of 55 µs. In the second technique the X-rays are focused with Kirkpatrick-Baez mirrors to achieve a spatial resolution better than 10 µm and a fast shutter is used to provide temporal resolution better than 20 µs while recording the diffraction pattern on a (relatively slow) X-ray CCD camera. Example data from experiments are presented where these techniques are used to study self-propagating high-temperature synthesis reactions in metal laminate foils.
已经开发出了两种用于对不可逆相转变进行时间分辨 X 射线微衍射的技术。一种技术是使用毛细管光学将高通量宽谱 X 射线束聚焦到 60µm 的光斑尺寸，并使用快速像素阵列探测器实现 55µs 的时间分辨率。第二种技术是使用 Kirkpatrick-Baez 反射镜对 X 射线进行聚焦，以实现优于 10µm 的空间分辨率，并使用快速快门在（相对较慢的）X 射线 CCD 相机上记录衍射图案的同时提供优于 20µs 的时间分辨率。本文展示了这些技术在研究金属层压板箔中的自蔓延高温合成反应中的应用示例数据。
