Crystal structure and magnetic properties of (1-x)BiFeO3 - xBaTiO3 ceramics across the phase boundary
The crystal structure and magnetic properties of lead-free ceramics (1-x)BiFeO3 - xBaTiO3 (x < 0.40) prepared by solid state reaction method were studied depending on the chemical composition and temperature. An increase in the concentration of barium and titanium ions leads to the structural transition from the polar rhombohedral structure to the cubic structure through the phase coexistence region characterized by a formation of pseudocubic phase. The isothermal magnetization measurements indicate nearly linear field dependences of magnetization in the temperature range 5 - 300 K which corresponds to a dominance of antiferromagnetic structure in the compounds with x < 0.3. Negligible value of remnant magnetization observed for the compounds having dominant rhombohedral structure diminishes in the compounds with (pseudo) cubic structure. The correlation between the type of structural distortion and magnetic structure is discussed based on the neutron and X-ray diffraction data as well as the magnetization measurements.
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