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Yes, there will be local variations in density as the density would decrease where there is a vacancy defect (as volume is the same and mass becomes less) and it would increase at the point where there is an interstitial defect (as volume is the same and mass becomes more). But since there is no loss of ions in the compound, the overall density of the ...


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The space group $P4_222$ has some inherent symmetry on special projections beyond its eight symmetry equivalents. The International Tables for Crystallography, Volume A (DOI: 10.1107/97809553602060000114) notes that planes normal to each of the three projections for tetragonal space groups, namely $[100]$, $[001]$ and $[110]$, having their own symmetry in ...


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As stated in the International Tables of Crystallography vol A, as a rule the origin is locatedat a centre of symmetry or at a point of high site symmetry. Anyway, the choice of such a coordinate system is not mandatory since in principle a crystal structure can be referred to any coordinate system. In particular, all centrosymmetric space groups are ...


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