Double oxides, uranium-transition

Some Uranium-Transition Element Double Oxides... 

Among the transition metals from chromium through zinc, iron remains the only element for which no double oxide formation with uranium oxide has been reported. Both the l.T and 1 3 compounds of mainganese, cobalt, and copper have been prepared, while only the 1 1 compound of chromium, and the 1 3 compound of nickel and zinc are known. 

Hydrothermal experiments with 1 1 mixtures of the transition element oxide and uranium trioxide with a single exception, did not give the desired MUO4 compounds. The CUO-UO3 experiment gave a mixture of CUUO4, CuUsOio, and a basic copper sulfate. All attempts to prepare 1 1 double oxides of the four remaining members of the series led to the formation of the corresponding triuranate phase mixed with unreacted transition element oxide. 

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