Recently I'm working with Fe doped tin disulfide NPs. Without doping the index was perfectly matched with standard data but when iron was doped 2theta was changed approximately 2degree. now what should i do to find out those miller index?
Hello M A G Osman
A XRD pattern is a description of the Unit Cell of your compound. Each peak corresponds to crystallographic plane, like (100), (112), (200), etc. According to Braggs' Equation, you can determine the interplanar distance from the planes to the origin of the cell, and then you can determine its dimensions, based on the positions of the peaks.
n. Lambda = 2 . d . sin (theta)
So, your pattern will show the crystallographic planes present in that Unit Cell you obtained. If you got a cubic cell, you will see peaks of cubic cells. But your point is, you had Tin Disulfide, matching with the theoretical pattern, wasn't it? And when doped with Iron, the whole pattern shifted 2 degrees, correct? The shift of the whole pattern can be interpreted as a change in Unit Cells dimensions. If your peaks shifted 2 degrees to higher angles, it means that your cell is now a little bit smaller with the Iron doping. If it is 2 degrees to lower angles, it means that the cell is a little bit bigger than without Iron. If you don't see extra peaks appearing in the pattern after doping, it means that the cell retained its original symmetry.
Reply if you need more details about the topic, or if you need extra help with your results.
Best regards,
Ricardo Tadeu.
hello Ricardo Tadeu Maia
Thank you for your reply. Need more details about the topic. Can I text you to discuss this?
Hello M A G Osman.
Of course, please send me private messages if you need to ask more questions.
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