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A simple method is presented to synthesize micro/nano-structured Fe–Ni binary oxides based on co-precipitation and subsequent calcination. It has been found that the Fe–Ni binary oxides are composed of the porous microsized aggregates built with nanoparticles. When the atomic ratio of Fe to Ni is 2 to 1 the binary oxide is the micro-scaled aggregates consisting of the ultrafine NiFe2O4 nanoparticles...
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