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In this paper, double perovskite Pr2NiMnO6 (PNMO) with different grain sizes were synthesized by sol-gel method through controlling the sintering temperature.Both the samples obtained crystallize in monoclinic P21/n space group and the grain size increases as the sintering temperature increasing.The average grain size is about 30 and 250 nm for PNMO sintered at 700 and 1200℃ respectively.