For a long-term solution to your problem, I sincerely recommend the preprint article at link DOI: 10.13140/RG.2.2.27720.65287/3

Have you verified the presence of crystalline forms of SiO2? Quartz, tridimite...however the peaks at low angle are very suspect, they suggest a phase with low symmetry. Could they be due to some reagent used during the synthesis?

Such multiple peaks of low intensities usually means the sample is not in a pure phase form. The peak with large intensities such as at around 10, 28 are proper crystalline peaks.

If you expect proper crystalline peaks with higher intensities, you can do-

1) Change your reaction timings after searching for crystallinity timings

2) Check the concentrations of your reagents as concentration also a factor in determining peak intensities

3) Check other reaction parameters.

4) Also at last check the amount of sample you are taking for XRD analysis. Sometimes using very less sample also kills the peak intensity.

Dear Abhinash Maharana

Thanks for your thorough response. I actually modified the graph on Origin software to have a better view of it. Maybe you're right, that the sample is not in a pure phase form or maybe my modification has intensified that issue. Below, I have attached the unmodified version of the graph. Let me know what you think of it.

Dear Amir Mostashari ,

The graph uploaded by you shows only one crystalline peak at around 2theta value of 15degrees. At this point only a particular pure phase may be existing. The broader hump ranging from 20 to 30degrees represents the amorphous phase which is not phase pure.

For better clarification you can use XRD peak matching softwares.