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VASUbhagwat
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Why is FWHM taken for calculations in XRD analysis of powder pattern? I mean, why don't we take the full peak value?
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FWHM stands for full width at half maximum and is a measure of the width of a peak in an XRD powder pattern. It is a metric used to quantify the degree of crystalline perfection in materials.
FWHM is typically calculated by measuring the distance between the points on either side of the peak where the intensity is half of the maximum intensity. This distance is then multiplied by 2 to get the full width at half maximum.
The FWHM in XRD analysis can be influenced by various factors such as the size and shape of the crystalline particles, the degree of crystallinity, and the instrumental broadening caused by the X-ray source and the instrument itself.
Understanding FWHM can help in XRD analysis by providing information about the crystalline perfection of a material. A smaller FWHM indicates a more perfect crystal structure, while a larger FWHM suggests imperfections or defects in the crystal lattice.
Yes, FWHM can be used as a qualitative tool to identify different phases in a sample. Each phase will have a unique FWHM value, and comparing the FWHM values of different peaks in a pattern can help identify the presence of different phases in a sample.