Fullproof seems to give possible answers to your question right away (beneath tabulated values).

Just in case my smartass answer isn't the answer to your question, could you rephrase your issue?

generally the "Resolution limited" message appears when the breadth of the diffraction line calculated using the instrumental resolution is larger than that measured in the analyzed sample. It is quite strange in this case because you have nanoparticles (are you sure of this?). did you put NPR=7 in the *.pcr file? have you put U=V=W=0? maybe your *.pcr file could help for identifying the problem

Dear Ferdinand, I've noticed the answers from Fullprof but it didn't solve my issue.

Dear Alberto, thank you! I'll check my pcr files. I didn't set U,V and W to zero, but they might be problem.

OK. take care that also the X parameter (the Lorentzian isotropic strain paramater) that you find in the same line of U, V and W must be 0 (obviously you can refine this parameter if you think that your nanoparticles are strained, but it's better to do this afterwards)

Alberto Martinelli

Have you tried Malvern Panalytical's HighScore Plus. You can request a demo version on its website:

For guidance in using HighScore Plus software suite based analysis I would recommend following webinars:

https://www.malvernpanalytical.com/en/learn/events-and-training/webinars/W20200529XRD

https://www.malvernpanalytical.com/en/learn/events-and-training/webinars/W20200611XRD

https://www.malvernpanalytical.com/en/learn/events-and-training/webinars/W20200702XRD?

https://www.malvernpanalytical.com/en/learn/events-and-training/webinars/W20200728XRD.html