Dear Researcher;

Since amorphous materials do not have a regular crystal structure, X-rays do not diffract significantly from certain planes in such structures. Instead, since the atoms are arranged irregularly, a widely distributed diffraction peak is observed. You can add an explanation to your thesis as follows:

"The pattern obtained as a result of XRD analysis shows a broad and diffuse peak indicating an amorphous structure. Unlike the sharp diffraction peaks observed in crystalline substances, since the atoms are distributed irregularly in amorphous materials, a broad distribution is observed in the diffraction pattern instead of a distinct peak. This broad distribution reveals that the substance under study does not contain long-range order and is amorphous."

In this way, you can explain the amorphous structure in a detailed and scientific language in the context of XRD analysis.

You can find related articles below

1)Sodium storage performance and mechanism of amorphous FePO4/rGO nanocomposite as a novel anode material for sodium ion batteries

2)Local atomic structural behavior in amorphous and crystalline diphosphate glasses co-doped by different transition metal ions (Ni2+, Cu2+ and Co2+): XAFS and XRD analysis

Kind Regards.

The pattern is typical of an amorphous phase. Do you expected a crystalline phase? I think that the main point that should be explained is: the conditions of synthesis or preparation are compatible with the formation of such kind of phase, or also the material that you prepared can give amorphous phase?

What material are you perfoming the XPD?

Amorphous solid or liquid material can give very broad peaks in the XRD pattern. If your material is glass, you can use RDF or PDF to measurement the distance between the neighbour atoms.

Baihong Sun Andre Fahl Marcella Bini the material is chitosan hydrogel with a viscosity which is slightly heavier than water so to perform the XRD, i dried many drops of the hydrogel on a glass slide

the methodology of the hydrogel was: Chitosan powder dissolved in acetic acid solution, then the solution was loaded with sodium hydrogen phosphate solution and calcium chloride solution. The pH of the mixed chitosan solution adjusted by adding sodium hydroxide solution drop by drop until pH 6.5 is reached, at which point the chitosan hydrogel was formed.

the idea is that XRD of the chitosan powder itself was as in the pdf

I think that to exclude to effect of the glass you should collect the xrd pattern of dried chitosan on another support to be sure that the amorphous pattern is due to chitosan (as it is possible) and not to the glass

Marcella Bini thanks you ,, but i wonder where the peak in the chitosan powder has gone ?

It could be possible that the process of drying reduced the original crystallinity (low) of the chitosan