Conductivity and magnetic properties of Zn sub(0.6Cu) sub(0).4Cr sub(0.5La) sub(0).04Fe sub(1.46O) sub(4)/PPy composites prepared by in situ inverse microemulsion polymerization

Nanosized Zn sub(0.6Cu) sub(0).4Cr sub(0.5La) sub(0).04Fe sub(1.46O) sub(4) ferrites were prepared by a rheological phase reaction method. Zn sub(0.6Cu) sub(0).4Cr sub(0.5La) sub(0).04Fe sub(1.46O) sub(4)/polypyr role composites were prepared by in situ inverse microemulsion polymerization method. The structure, morphology, conductive and ferromagnetic property of ferrite powders and composites were characterized by powder X-ray diffractometer (XRD), transmission electron microscope (TEM), Fourier transform infrared (FTIR) spectra, four-probe instrument, and vibrating sample magnetometer (VSM). It was demonstrated that there was some interaction between the ferrite particles and PPy chains in the Zn sub(0.6Cu) sub(0).4Cr sub(0.5La) sub(0).04Fe sub(1.46O) sub(4)/PPy composites. The TEM showed that composites presented core-shell structure with a magnetic core of ferrite and an amorphous shell of PPy. The conductive magnetic properties of composites depended on the ferrite content. As the ferrite content increased from 10% to 30%, the conductivity decreased from 0.0423 to 0.0139 S/cm, while the saturation magnetization increased from 4.0 to 9.1 emu/g, and coercivity from 101.6 to 133.5 Oe, respectively. The bonding model for the composites was also studied.