Abstract

The subject is reviewed under the following headings: introduction; nomenclature and definitions; the divalent state: A/sup +1/sub(w)Re/sup +2/sub(y)X/sup -1/sub(z) (synthesis; ARE/sub 2/X/sub 5/ compounds; AREX/sub 3/ compounds; A/sub 2/REX/sub 4/ compounds); in between: A/sup +2/sub(w)RE/sup +3/sub(y)X/sup -1/sub(z); the trivalent state: A/sup +1/sub(w)RE/sup +3/sub(y)X/sup -1/sub(z) and A/sup +1/sub(w)B/sup +1/sub(x)RE/sup +3/sub(y)X/sup -1/sub(z) (synthesis; ARE/sub 2/X/sub 7/ compounds; A/sub 2/REX/sub 5/ compounds: inohalides; the monohydrates: A/sub 2/RECl/sub 5/.H/sub 2/O; close-packed structures and derivatives; volume chemistry; the elpasolites: A/sub 2//sup +1/B/sup +1/RE/sup +3/X/sub 6//sup -1/; A/sub 3/RE/sub 2/X/sub 9/ compounds: sorohalides; A/sub 3/REX/sub 6/ compounds: nesohalides; a survey of the complex rare-earth fluorides); the tetravalent state (synthesis; A/sub 3/REF/sub 7/ and A/sub 2/BREF/sub 7/ compounds; miscellaneous compounds); references.

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