How to calculate the eelemental compositoin using edx?
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In fact, you applied the mathematics correctly. However, as you also realized, the numbers are quite "strange". The reason is explained by Raghavendra K G: measurement errors and unsufficient correction terms. On the other hand, EDX or even EPMA results can only give a glue about the approximate composition. The major requirement are of course that your material is homogeneous and stable in vacuum and during electron bombardment. Using your results I would assume a phase AB2C3D7. But it can be also A(B,C)5 D7.....or anything else...In order to discuss this further you should tell us, which element did you measure. Also their reliability is different i.e. the errors can be much bigger for some elements compared to others.
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