Structural dielectric and magnetic properties of (1-x)BiFeO3-xBa0.9Ca0.1Ti0.9Sn0.1O3 ceramics

(1-x)BiFeO3-xBa0.9Ca0.1Ti0.9Sn0.1O3 (0,1 < x ≤ 0,5) ceramics are synthesized by conventional solid-state reaction method. These ceramics are characterized by X-ray diffraction, Raman spectroscopy, dielectric and magnetic measurements. X-ray diffraction data refined via Reitveld method revealed that the crystal structure changes from biphasic structures (R3c + Pnma) for x = 0.1; x = 0.2 and x = 0.3 with different percentages to orthorhombic (Pnma) for x = 0.4 and x = 0.5, with (Ba0.9Ca0.1Ti0.9Sn0.1) substitution. These results were confirmed by Raman spectroscopy analysis. Moreover, Ba0.9Ca0.1Ti0.9Sn0.1O3 doped BiFeO3 significantly reduces electric leakage and enhances dielectric properties. The obtained hysteresis loop (M-H) indicates that magnetization was enhanced and the maximum value of remnant magnetization occurred at x = 0.2 with Mr = 0.163 emu/g. This can be explained by the suppression of the cycloid spin structure. A further increase in the substitution percentage beyond the sample x = 0.20 caused a large reduction in residual magnetization due to the dominant participation of collinear antiferromagnetic scheduling in the Pnma space group.