Abstract
A description is given of the preparation and characterization of a number of compounds of the type A/sub 2/BB/sup 1/O/sub 6/ where A = Ca, Sr, Ba; B/ sup 1/ = Re or Os; and B represents a variety of univalent, divalent, and trivalent cations. Evidence was obtained for the existence of heptavalent osmium in the compound Ba/sub 2/LiOsO/sub 6/. The structure of many of these compounds was of the ordered perovskite type, but the hexagonal barium titanate structure was adopted in the osmium compounds when A is barium and B is a transition- metal cation having d electrons. This structure also was found with the compounds Ba/ sub 3/Cr/sub 2/ReO/sub 9/ and Ba/sub 3/Fe/sub 2/ ReO/sub 9/. Preliminary measurements of the magnetic properties of some of the compounds are reported. (auth)
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