Abstract
The crystallographic analysis of Rb2NaAlF6 $$(Fd\bar{3}m)$$ and (Al,V)4(P4O12)3 $$(I\bar{4}3d)$$ cubic structures and the trigonal structure of phenakite Be2SiO4 $$(R\bar{3})$$ is performed. In Rb2NaAlF6 a large and heavy Rb cation stabilizes cation and anion sublattices, promoting their maximum symmetry. In the structure of cyclic tetraphosphate, the core is formed by the cation sublattice with a noticeable deviation of P cations from its nodes. The anion arrangement ordered by pseudo-cubic and hexagonal sublattices with pseudo-symmetry features dominates in the trigonal structure of phenakite.
Published Version
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