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The complex fluorides AIBVF, fall into five structural types, the structure This relation is here New preparations are also given for some complexes of this adopted depending on the sizes of the ions A and B. discussed. general type.THE structures of complex fluorides of general formula ABF, have been discussed by Cox who concluded that the distribution of structures cannot be accounted for solely on the basis of the radius ratio of the ions A and B. It is now possible to add considerably to the range of these complexes and it is found that with more data there is a very clearly defined relation between the size of the ions A and B and the structure which is adopted.

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