Please note that the aluminum oxide has many different phases. You need to mention clearly. Just type in google image and you get ready reference based on XRD images.
There may be many phases of silicon oxide nanoparticles in the database of XRD analysis. The angle will varied with different phase. So, you should mention the properly.
I know. but my results don't show peak value.Pls find herewith attached doc.How can do calculate particle size and phase analysis. Results compared with literature same peak and image.