Dear Dr. Mohammed Hossan Shahid Shohrawardy ,

that tiny and quite narrow peak is propably due to a crystalline small particle of an impurity; e.g. (100) of SiO2.

See for example Fig. 1 of:

Article X-Ray Peak Profile Analysis of Silica by Williamson–Hall and...

or e.g. calcite;

see for example Fig. 4 of:

Article Cement-Stabilized Waste Sand as Sustainable Construction Mat...

You should ignore that peak...

Best regards

G.M.

This thin peak could be also due to a higher count read by the detector, i.e. it is not a peak but a noise. It has a FWHM very small and different from other peaks, so it could be due to impurity or it is not a peak. How many points you can see in the FWHM? It is a single point?

Dear Researcher

Changes or modifications in the chemical structure of the fiber can cause the formation of new crystalline phases and therefore the appearance of new peaks. The moisture content of the fiber or environmental conditions can affect the crystal structure, which can lead to changes in the XRD pattern.

Kind Regards

But Özgün Ceren Akbay ,

that is a single tiny and very narrow peak, which is either caused by a very little amount of impurity or even some electronic issue as Marcella Bini pointed out. Maybe due to arcing of some electronics close to the lab or even the XRD tube itself. An additional crystalline phase would reveal a finite width of the peak(s).

Dr. Mohammed Hossan Shahid Shohrawardy , you should do two things:

a) repeate the measurement of the untreated sample, in order to exclude any electromagnetic interference from outside and

b) scramble the sample and repeate the XRD scan; the angular distribution of the crystallites of the tiny amout of impurities will be changed...

Best regards

G.M.

Dear Gerhard Martens

Thank you, the points made by Marcella Bini are really remarkable. I agree that the narrow and small peaks observed in XRD analysis may be due to external factors such as contamination or electronic interference. Such situations are among the important factors to be careful about, especially in a laboratory environment.

Considering that an additional crystalline phase usually creates wider peaks, additional checks should be made to better understand the source of this peak. Thank you again for your suggestions and contributions.

I would like to thank all of you for your valuable comments. I agree with you.

Thanks and Regards, Mohammed Hossan Shahid Shohrawardy,