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Nanocrystalline nickel chromium ferrite (NiCrxFe2−xO4, x = 0.1, 0.2) have been prepared by the chemical co-precipitation method. Half of the samples have been sintered at 620∘C and the other at 1175∘C. Then polypyrrole (PPy)–NiCrxFe2−xO4 composites have been synthesized by polymerization of pyrrole monomer in the presence of NiCrxFe2−xO4 nanoparticles. The structure, morphology and magnetic...
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