Room temperature solid state transformation from Ag2Cu2O3 to Ag2Cu2O4 by Ozone Oxidation.

The mixed silver–copper oxide, Ag2Cu2O4 has been previously synthesized by electrochemical oxidation of suspensions of the precursor Ag2Cu2O3 and also by direct oxidation/coprecipitation of soluble salts. This work shows how the transformation from Ag2Cu2O3 to Ag2Cu2O4 can take place in solid state at room temperature by ozonization of the precursor. The final phase is overstoichiometric in oxygen but shows the same structural features of the firstly described phase Ag2Cu2O4. The maximum content of oxygen achieved is 4.34 per unit formula. SEM micrograph of Ag2Cu2O4 nanocrystals obtained by room temperature ozonization of a Ag2Cu2O3 suspensionThe authors thank Dr. F. Bardé and Prof. JM. Tarascon (LRCS, Univ. Picardie, Amiens, France) for access to equipment and financing from Spanish Ministry of Science and Education (PGC PB98-0491, MAT2002-04529-C03 and fellowship for DMR).Peer reviewe