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The effect of particle size on the magnetic and optical properties of cobalt oxide Co_3O_4 has been investigated. Single phase Co_3O_4 nanoparticles were synthesized by co-precipitation route and their structure was confirmed through X-ray diffraction analysis. The average crystallite sizes of the nanoparticles as determined from the X-ray diffraction were found to lie in the range of 13 to 59 nm...
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