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Manganese ferrite powder has been synthesized by ultrasonically assisted co-precipitation method using Fe(NO3)3·2H2O and Mn(NO3)2·H2O as precursors. The precipitate was washed and dried in oven at 80°C for 2h to obtain the initial MnFe2O4 powder (denoted by sample S1). Subsequently, other three samples (denoted by S2, S3 and S4) were prepared starting from the initial powder, which was subjected to...
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