Yes for this you can use solvothermal method of synthesis by changing the resident time for synthesis there is a difference you can see in the intensity without drop in a angle.

For more details you can read my research paper..

Interpretation of peak intensity in XRD is not easy. The orientation of the crystal planes to the beam is crucial as is the atomic mass of the material.

Dear Usman

The change in the intensity of XRD pattern could be due to some preferred orientations of the grains due to high temperature preparation.