How to calculate particle size from a peak list?

In summary, the Scherrer equation is a widely used method for determining particle size from XRD data. It involves using a constant, wavelength of X-ray radiation, peak width, and Bragg angle to calculate the particle size. All of this information can be obtained from a peak list obtained from XRD.
  • #1
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Hi guys, I want to calculate the size of nanoparticles by using data from a peak list obtained from the use of XRD. Can anybody help me calculate the particle size by using the scherrer equation? Thanks! :)
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The Scherrer equation is a common method for calculating particle size from XRD data. The equation is as follows:Kλ = 0.9 λ/βcosθWhere K is a constant (which is usually taken to be 0.89), λ is the wavelength of the X-ray radiation used, β is the full width at half maximum (FWHM) of the peak from the diffraction profile, and θ is the Bragg angle of the peak. To use the equation, you need to know the FWHM of the peak obtained from the XRD data and the Bragg angle at which it appears. Once you have these two pieces of information, you can plug them into the equation and calculate the particle size. Hope this helps!
 

1. How do you define particle size?

Particle size is the measurement of the diameter of an individual particle, typically expressed in nanometers (nm) or micrometers (μm).

2. What is a peak list?

A peak list is a data set that contains information about the intensity and position of peaks in a spectrum, typically obtained from analytical techniques such as X-ray diffraction or laser diffraction.

3. How do you calculate particle size from a peak list?

Particle size can be calculated from a peak list by using the peak position and the known wavelength of the analytical technique (e.g. X-ray or laser) to determine the diffraction angle, and then applying the appropriate mathematical equations for the specific technique to convert the angle to a particle size measurement.

4. Are there different methods for calculating particle size from a peak list?

Yes, there are different methods for calculating particle size from a peak list depending on the analytical technique used. For example, the Scherrer equation is commonly used for X-ray diffraction, while the Mie theory is used for laser diffraction.

5. What factors can affect the accuracy of particle size calculations from a peak list?

The accuracy of particle size calculations can be affected by factors such as the quality of the peak list data, the accuracy of the analytical technique, and potential interferences from other particles or impurities in the sample. It is important to carefully evaluate and validate the data and methodology used for particle size calculations.

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