Open AccessDAFS experiments for phase‐sensitive determination of local structure around Zr in Co/Zr multilayers
Author(s) -
Meyer D. C.,
Kupsch A.,
Richter K.,
Paufler P.
Publication year - 1999
Publication title -
journal of synchrotron radiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 99
ISSN - 1600-5775
DOI - 10.1107/s0909049598014150
Subject(s) - phase (matter) , materials science , crystallography , chemistry , organic chemistry
Diffraction Anomalous Fine Structure (DAFS) experiments were applied to support EXAFS analysis for studying amorphisation behaviour of Co/Zr multilayers stimulated by annealing below the crystallisation temperature. The layers, prepared by electron beam vaporisation, initially polycrystalline, exhibited hcp structure. The solid state reaction (SSR) during annealing was indicated by decreasing X-ray reflection intensities. This information and the knowledge of short-range order in Zr crystallites determined by DAFS enabled contributions of amorphous and crystalline phases to the average EXAFS signals to be separated. DAFS experiments were carded out at the Zr-K absorption edge using Zr 0002 reflection in symmetric geometry. A strong [0002] fibre texture was observed which did not change during annealing. After more than 1 hour annealing at 250°C Co atoms have been detected in the Zr crystallites at a Zr-Co distance of 3.03A.