Mononuclear complexes binary structures

A simple possibility for a complex halide is that it adopts a structure of a halide (or oxide) A, X with A and B replacing, either statistically or regularly, the positions occupied by atoms of one kind in the binary halide (oxide) these form our class (a) in Table 10.1. Known examples are all fluorides, that is, they are ionic crystals, and the basic requirement is that the ions A and B are of similar size and carry charges appropriate to the structure, as in Na Y F4 or KaU Fg with structures of the fluorite type. Other complex halides are conveniently classified according to the type of grouping of the B and X atoms in the crystal. These atoms may form a finite group, in the simplest case a mononuclear group BX , or the B... 

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