1 to 2% level is easily achieved if you have good enough data and the structures are positively identifiable. Firstly you need to ensure the sample is ground to powder around 1 micron particle size. Prepare a flat surface without preferred orientation; use side loading. Count for a sufficiently long time such that the peaks of the compound of interest are distinguishable from the background signal - some trial and error needed here (see below).
If you need to quantify this then identify all components. Use quantitative Rietveld software to refine the model onto the data. It should be possible to get below 1%.
This method will fall down if there are isostructural solutions for the identifications, such as happens often in the cubic system.
Read from page 44 onwards in this Bruker presentation. It deals with lower limits of detection that you will find most useful (then read the whole thing!).
For some reason that .pdf file is only loading as an image - I don't know why...
UPDATE: its a bug, response from RG
Thanks for getting in touch. We've been experiencing some technical issues that should be fixed soon. Please accept our apologies for the inconvenience, and thank you for your patience.
Dear Ritwik,
please perform a right hand mouse click onto the 'Bruker Image' of Ian's answer and go to the menue point 'open new link'.
Then the pdf will open correctly.
It is a very instructive document. Recommendable to read (at least for beginners).
Good luck
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