Dear,

you have to do Small-angle X-ray scattering (SAXS) is an analytical technique that measures the intensities of X-rays scattered by a sample as a function of the scattering angle. Measurements are made at very small angles, typically in the range of 0.1 deg to 5 deg. for nanao particle . and also you can read out attached paper link.

https://www.sciencedirect.com/science/article/abs/pii/S095006180600136X

Article X-ray diffraction analysis of nanoparticles: Recent developm...

Se can has different polymorphs and each of which has different diffraction patterns. Do you have the original XRD data?

If the wavelength of your X-ray source = 1.54060 Å and if you have hexagonal form (PDF 86-2244), you should roughly have these data (before Rietveld refinement):

d() 2Theta (°) I fix h k l Comment

3.72391 23.876 550 1 0 0

2.96264 30.141 1000 1 0 1

2.15000 41.989 138 1 1 0

2.04384 44.282 299 0 1 2

1.96816 46.081 233 1 1 1

1.86195 48.876 22 2 0 0

1.74008 52.550 196 2 0 1

1.63000 56.403 56 0 0 3

1.61456 56.992 111 1 1 2

1.49322 62.110 51 1 0 3

1.48132 62.666 105 0 2 2

1.40751 66.361 131 2 1 0

1.35259 69.431 43 1 2 1

1.29891 72.745 39 1 1 3

1.24130 76.714 1 3 0 0

1.22644 77.817 8 2 0 3

1.21982 78.320 29 2 1 2

1.20314 79.619 48 0 3 1

1.16151 83.087 33 1 0 4

1.10683 88.206 36 3 0 2

Copy the above text into notepad and open it in excel.

Download xrd patter of Se

Different polymorph will give different 2theta but these are well documented.

Google it

Se nanoparticles, dominant peaks occurs at ~23 and 29 deg. Amorphous and trigonal phase Se NPs XRD pattern details are available in Article “Sweet Chemistry”: a Green Way for Obtaining Selenium Nanopa...

You can read this article, you will get clear idea.

Thanks all for your valueable suggestions.

Ali Ansari Hamedani yes sir I have the original XRD data of my Nanoparticle. Can you please share the Paper (Article) from which these informations you got. My nanoparticles are mostly spherical.

The data I shared is from the Database PDF-2000 which is matched with Diffrac.Eva program.

The reference stated there is:

Structure

Publication: Kristallografiya

Detail: volume 14, page 230 (1969)

Authors: Avilov, A.S., Imamov, R.M.

Primary Reference

Publication: Calculated from ICSD using POWD-12++

Please find one paper published by "Miguel A. Ruiz Fresneda" e. He gave a very good explanation about XRD of se nanoparticles.

I am also attaching one more pdf file. In this Paper, the author gave one table of Co1-xZnxFe2O4 . It might be useful for you. I hope you will get some idea