Preparation of core/shell La0.7Sr0.3MnO3/NiFe2O4 composite structure nanopowders via polymer-network gel route

摘要

A core-shell (La0.7Sr0.3MnO3/NiFe2O4) structure composite nanoparticles were prepared by a modified polymer-network gel route. The impact of various factors in the composites preparation were discussed and analysed, and the optimum parameters have been comfirmed. The uniform particle morphology and the core-shell structures were characterized by scanning electronic microscopy(SEM) and transmission slectron microscopy(TEM), respectively. The components of core and shell were determined by the Energy Dispersive Spectroscopy (EDS) and the X-ray diffraction. The VSM analysis showed that the coercivity of core-shell nanocomposites increased from 25 to 161 Oe and the saturation magnetization decreased from 47.9 to 25.2 eum/g.