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Spherical Ag-Pd alloy particles were prepared from aqueous solutions of AgNO 3 and Pd NO 3 2 by ultrasonic spray pyrolysis. As-prepared powders were dense and non-agglomerated particles, which had sub-micron size and narrow size distribution. XRD shows that as-prepared particles are polycrystalline and the crystal phase of the as-prepared particles has an alloy composition. Ag-Pd particles obtained from spray pyrolysis offer superior oxidation-resistivity of Pd as compared with those obtained from coprecipitation.