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Why are certain lattices compatible with only certain point groups and not all point groups?

What is the plane group of the structure shown above in fig 11.29 (if it has one)? It is pm. In this plane group, you are free to choose the lattice parameters $a$ and $b$ (they can be different or ...
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6 votes

Crystal structures exhibiting dimeric arrangement of tetrahedrally coordinated cations

Given the unit must be isolated and should not be the subunit of an ionic network, the following graph model for CCDC ConQuest's (ver. 2022.3.0) query with restraints based on connectivity $(\mathrm ...
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