X-rayDiffraction

2020-09-02 16:01  下载量：1

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X-ray Diffraction (XRD) is a technique to determine the atomic and molecular structure of a crystal based on Bragg diffraction. X-rays are commonly used to produce the diffraction pattern because their wavelength is typically the same order of magnitude (1–100 angstroms) as the spacing d between planes in the crystal. The information on the intensity and angle of the diffractive X-rays can produce a 3D picture of the density of electrons within the crystal, which leads to the mean positions of atoms as well as chemical bonds, disorders, and other information. If it’s a single crystal sample, it’s usually mounted on a goniometer, which can position the sample at selected orientations. The benefits of the low-temperature XRD are to reduce the radiation damage and thermal motion. Low-temperature XRD also helps characterize superconductor materials.

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