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Depth-graded Mo/Si multilayer coatings for hard x-rays.

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    This study explores novel multilayer coatings for hard X-ray applications. Molybdenum/silicon (Mo/Si) coatings with boron carbide (B4C) barrier layers demonstrate superior reflectivity for large field-of-view imaging.

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    Area of Science:

    • Materials Science
    • Optics
    • X-ray Physics

    Background:

    • Multilayer coatings are crucial for X-ray optics.
    • Optimizing reflectivity requires understanding layer interfaces.
    • Non-periodic structures offer advantages for broadband applications.

    Purpose of the Study:

    • To systematically investigate non-periodic Mo/Si multilayer coatings.
    • To evaluate the impact of B4C barrier layers on coating performance.
    • To optimize coatings for hard X-ray applications at 17.4 keV.

    Main Methods:

    • Fabrication of Mo/Si multilayer coatings with and without B4C.
    • X-ray reflectivity measurements at 8.05 keV and 17.4 keV.
    • Transmission Electron Microscopy (TEM) and thin film stress analysis.

    Main Results:

    • Mo/Si coatings with B4C barrier layers exhibited the highest reflectivity.
    • Interface properties significantly influence coating performance.
    • Nanoscale layer thicknesses were optimized for performance.

    Conclusions:

    • B4C interface layers enhance reflectivity in Mo/Si multilayer coatings.
    • These optimized coatings are suitable for hard X-ray applications.
    • Understanding interface physics is key to advanced X-ray optic design.