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# How would you expect the positions of peaks in a ZnS powder X-ray diffraction pattern to...

How would you expect the positions of peaks in a ZnS powder X-ray diffraction pattern to compare with those for your sample of ZnO

Okay so ZnS and ZnO has difference in the anions but both of them shows hcp and ccp packings.

The peaks (100) (002) (101) remaining same but the position of the peak will be different for the two since one has S with higher atomic no and one has O with lower atomic number. Now with this keeping in mind we can say that the ZnS peaks will shift towards lower 2theta values since the interplanar distance (d) will increase in case of the ZnS due to larger size of S.

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