WAXD (Wide Angle X-ray Diffraction) Analysis

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Summary

When X-rays enter a material, the X-rays are absorbed into the material or scattered. Out of the modes of this scattering, the mode of scattering in which the wavelength of the entered primary X-rays is the same as that of the scattered secondary X-rays is called “elastic scattering”. When you focus on this elastic scattering, you will see a diffraction phenomenon. When X-rays are made incident on a crystalline material, a diffraction pattern peculiar to the crystals (a diagram of correlation between diffraction angle and diffraction intensity) is obtained. You can obtain information on the quality, amount and arrangement conditions of the crystals. With crystalline polymers, you can get information on paracrystalline materials.

What can be known by use of wide angle X-ray diffraction analysis?
Characteristics of diffraction patters Related information
Location and intensity of diffraction rays Qualitative analysis, crystal structure
Width of diffraction rays Crystallite size
Crystal integrity (arrangement of atoms and gratings)
Intensity attenuation at high order diffraction angle Crystallinity, thermal oscillation of atoms
Azimuthal dependence of a sample at diffraction intensity Deviation of crystal orientation (aggregate structure, orientation)
Intensity ratio of amorphous halo patterns and crystalline peaks Crystallinity

Example of analysis

WAXD pattern of polyethylene

From the figure on the left, it can be seen that this sample has fine crystals based on polyethylene orthorhombic system in a non-oriented state. A result of analysis indicates that the degree of crystallinity is 79%

Search Number 1018

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