Abstract
BaTiO3-CoxFe3-xO4 (x is regulated by the R value, R = M (FeCl2•4H2O)/M (CoCl2•6H2O), the molar ratio of FeCl2•4H2O to CoCl2•6H2O) core-shell particles were synthesized by facile homogeneous coprecipitation method utilizing urea as pH adjuster and air as oxidizer. The morphology, microstructure and the chemical compositions of the core-shell particles were characterized by TEM, XRD and EDX, respectively. The results showed that a compact, continuous and pure spinel structure CoxFe3-xO4 shell was formed on the surface of BaTiO3 particles after the homogeneous coprecipitation processes at low temperature (<100 °C). The results of vibrating sample magnetometer (VSM) showed that with the R value increasing from 1.5 to 4, the saturation magnetization and coercivity of the BaTiO3-CoxFe3-xO4 core-shell particles increased from 16.2 emu/g to 38.7 emu/g and 136.6 Oe to 386.5 Oe, respectively. The magnetism of BaTiO3-CoxFe3-xO4 core-shell particles can be controlled by regulating the R.
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