EDS vs XRF

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http://youtube.com/watch?v=TD0wZMiWr70

This video explains the differences between EDS and XRF • EDS stands for Energy Dispersive X-ray Spectroscopy, also called EDX or EDXS • XRF stands for X-rays fluorescence spectroscopy. • Both EDS and XRF are useful and very close characterization techniques. In most cases, both techniques use the same detector, which detects X-rays. • Both techniques (EDS XRF) are used for elemental analysis (qualitative and quantitively) • _________________________________________________ • The key differences between EDS and XRF are as follows: • 1. In EDS, the sample is being excited by the primary electrons beam, while in XRF, the sample is being excited by the primary X-ray. • 2. EDS is performed with the SEM while there is no such arrangement for XRF. • 3. The irradiation area in EDS is small while there is large irradiation for XRF. • 4. EDS is not always performed with certified standards where there is a certified standard for XRF • 5. The working principles for both EDS are XRF same, but in the case of EDS, primary electrons are used to excite the sample, while in XRF, the primary x-rays are used to excite the sample. • _________________________________________________ • Working Principle: • Both techniques work on the sample principle. In XRF, the atoms in a sample are bombarded with X-rays, and electrons from outer shells drop down to fill the vacant position of the atoms. As a result, energy is produced, some of which are in the form of X-rays. Each element has its own unique X-ray characteristics, so the emitted X-rays from a sample can provide qualitative and quantitative compositional information about the sample. Whereas, in EDS, the sample is bombarded with electrons, and the same secondary X-rays are produced. • _________________________________________________ • Limitation of EDS XRF: • Both EDS XRF are not good for lighter elements (less than sodium, Na), but the former is better for light elemental composition. Without a vacuum chamber, the XRF does not even detect light elements at all. This may be due to the fact that in XRF, the primary source is X-rays which is a wave in nature while the EDS works well for lighters elements due to the fact that the primary source for excitation the sample is an electron which is a particle in nature. • _________________________________________________ • The detail difference between XRD and XRF can be found in the following link • • XRD Vs XRF • Both XRD and XRF are useful techniques to characterize any materials. • XRD stands for X-rays diffraction. • XRF stands for X-rays fluorescence. • There are many differences between XRD and XRF, but I will only provide the most important ones: • 1. XRD determines the mineralogy such as rocks, minerals, oxide materials (TiO2, ZnO, NaCl, CaCO3…) while XRF Analyzes the Chemistry • 2. XRD Identify phases while XRF analyzes the chemical composition • 3. XRD is used for the compound analysis, while XRF is used for elemental analysis • 4. XRD analyzes the compounds such as the different phases of Ca*, CaCO3, Ca(OH)2 while the XRF only reveals about the concentration of *Ca • 5. Similarly, XRD reveals about he the Fe phases like Fe2O3, Fe3C, whereas the XRF provides the details information about the concentration of Fe in the sample. • _________________________________________________ • The details video in the XRF can be found in the below link • • XRF: X-ray Fluorescence Analysis • XRF: X-Ray Fluorescence Spectroscopy is a useful technique in nanomaterials characterization. • This technique is basically used to analyze the film thickness and elemental composition (qualitative quantitative) • Qualitative analysis: • It means that the XRF analysis reveals the elements that exist, such as Pb, Fe, Co, Cu, Ag, etc. • Quantitative analysis: • It means that the XRF analysis reveals the existing elements in terms of atom% or wt%. • XRF is a non-destructive technique. • A Non-destructive technique means that the sample can be analyzed again and again. Such techniques don’t destroy the sample. • As the XRF working principle is based on the emission of light so let's first discuss the fluorescence. • Fluorescence: • It is basically the emission of light (in this case, X-rays) by a substance that has absorbed X-rays. In most cases, the emitted light has a longer wavelength than the absorbed radiation. • Working Principle: • When atoms in a sample are bombarded with X-rays, inner- shell electrons knocked out, and immediately, the electrons from outer shells drop down to fill the vacant position of the atoms. As a result, energy is produced, some of which are in the form of X-rays. Each element has its own unique X-ray characteristics, so the emitted X-rays from a sample can provide qualitative and quantitative compositional information about the sample.

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