期刊
JOURNAL OF SYNCHROTRON RADIATION
卷 24, 期 -, 页码 796-801出版社
INT UNION CRYSTALLOGRAPHY
DOI: 10.1107/S1600577517008013
关键词
X-ray reflectivity; multilayer; interdiffusion
资金
- US Department of Energy [DE-SC002509]
- Chinese Scholarship Council (CSC)
- National Science Foundation
- National Institutes of Health/National Institute of General Medical Sciences under NSF [DMR-1332208]
- DOE [DE-SC0016035]
- CHESS
- U.S. Department of Energy (DOE) [DE-SC0016035] Funding Source: U.S. Department of Energy (DOE)
A technique for measuring interdiffusion in multilayer materials during rapid heating using X-ray reflectivity is described. In this technique the sample is bent to achieve a range of incident angles simultaneously, and the scattered intensity is recorded on a fast high-dynamic-range mixed-mode pixel array detector. Heating of the multilayer is achieved by electrical resistive heating of the silicon substrate, monitored by an infrared pyrometer. As an example, reflectivity data from Al/ Ni heated at rates up to 200 K s(-1) are presented. At short times the interdiffusion coefficient can be determined from the rate of decay of the reflectivity peaks, and it is shown that the activation energy for interdiffusion is consistent with a grain boundary diffusion mechanism. At longer times the simple analysis no longer applies because the evolution of the reflectivity pattern is complicated by other processes, such as nucleation and growth of intermetallic phases.
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