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In the present work, Co0.5Mg0.5Fe2O4/Ba0.85Sr0.15TiO3 (CMFO/BST) composite  ceramics with different molar ratios (1:1, 1:2, 1:4, 1:6 and 1:8) were  prepared by sol-gel method and sintered at 1150°C. The effects of molar  ratio on the structure, dielectric and multiferroic properties were  comparatively studied. The results indicate that all the synthesized  composites mainly show bi-phase structure except slight presence of impurity  phases. The surface of the specimens is relatively dense and the mean grain  size is about 2 μm. It decreases at first and then increases with the  increased molar ratio. The dielectric constant shows decreased trend with  increasing the molar ratio, while the dielectric loss presents the opposite  behaviour. With the increase of molar ratio, the height of the relaxation  peak decreases while the peak position shifts to higher temperature range.  The relaxation peak evolves gradually from one to two peaks. The residual  polarization increases with voltage but decreases with frequency. The  maximal polarization of 1.28 μC/cm2 is obtained in the specimen with the  molar ratio of 1:8, due to the largest concentration of ferroelectric phase  BST. The magnetization shows abnormal behaviour with the change in molar  ratio. The largest saturation and remnant magnetization are 20.89 and 12.66  emu/g, respectively when the molar ratio is 1:2 due to the stronger  interface interaction effect between the two phases.

Influence of molar ratio on dielectric, ferroelectric and magnetic properties of Co0.5Mg0.5Fe2O4/Ba0.85Sr0.15TiO3 composite ceramics