Dear Dr. Manickam,
If you are doping the bigger ions of Sr at the place of Cu2+, it is obvious to have expansion of the lattice due to larger ionic radii of Sr2+ ions. Therefore the lattice of the Sr2+ containing above materials will be larger than that of undoped one. This implys that the 'd' spacings within the lattice will also increase. That's why you will get the shift in 2theta position towards lower 2theta values.... If you would have doped the same material with smaller (ex Ca2+) ions at the place of Cu2+ you would have got the shift towards higher 2theta side as the interplanar distances are decreasing. In this case I assumed that partial isomorphous substitution of Sr2+ at the site of Cu2+. ....
Therefore the shift in reflections positions either at lower or higher 2theta side is an indication of isomorphous substitution.... within the lattice,,,,
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