My diffraction spectrum from Mg-Al LDH with intercalated carbonate and hydroxide lost its 003(hkl). The 006 is small but visible similar to 015. Other peak intensities remained the same. Albeit 012 is a bit lower than usual. I presume this cannot be a guestion of delamellation or preferred orientation. Could sample preparation or instrumentation be the reasons for such phenomenon? We carried the study out with Bruker D8 Discovery (2theta: 5-100 deg.) that was eqquipped with a HI-Star 2D and pressed our samples gently to amorphous silica holder with the aid of ethanol.
the removal of the peak should not come from your instrument, it could be preferred orientation, but this should affect all of your peaks. try measuring in a transmission geometry and see if you get the same result or even better if you have a Gandolfi camera (this completely removes any preferred orientation)
other the that it could be destructive interference from the intercalation, but carbonate and hydroxide should not be able to do that on their own.
hope it helps
ps. it is a diffractogram and not a diffraction spectrum
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