Strukturen cäsiumhaltiger Fluoride,III. Die Kristallstrukturen der hexagonalen Elpasolithe: 12 L-Cs2NaCrF6, 12 L-Cs2NaFeF6 und 2 L-Cs2LiGaF6

The results of complete X-ray single-crystal structure determinations of the isostructural compounds Cs₂NaCrF₆ and Cs₂NaFeF₆, crystallizing in a 12 L-structure in space group $\text{R}\text{3}\text{m}$, as well as of 2 L-Cs₂LiGaF₆ (space group $\text{P}\text{3}\text{m1}$), are reported. The structures, which contain face sharing octahedra, are discussed in comparison to the hexagonal fluoroperovskites. The mean distances observed, CrF = 1.910 Å, FeF = 1.926 Å, GaF = 1.93 Å, are compared to recently published data.