New intercalation compounds of the pseudo-layered oxides (UTeO5)-Te-VI
-O-IV and (USeO5)-Se-VI-O-IV have been prepared and characterised. At
ambient temperatures products of the type A(x)UMO(5) (x less than or e
qual to 1; A = Li, Na, H, NH4) are formed by both host oxides with min
imal structural change. Magnetic susceptibility measurements confirm t
hat U-V species are formed on intercalation.