Abstract
The magnetoelectric ceramics with the composition (1-x)AlFeO3-xBaTiO3 ((1-x)AF-xBT, 0 ≤ x ≤ 0.2) have been synthesized by high energy ball milling method. The BaTiO3 substitution leads to a crystal structure transformation from orthorhombic Pna21 to rhombohedral R3c. Due to this structural transformation, variations are also induced in the a/b ratio and the phase fraction of the orthorhombic phase. Further, the substitution of AlFeO3 by BaTiO3 results in a chemical pressure which induces the ferromagnetic-like behavior and the ME effect in (1-x)AF-xBT ceramics. All the ceramics have shown an unsaturated polarization behavior, and the maximum polarization is attained at x = 0.05. The ME coupling effect has been achieved in all the ceramics, and the optimal ME coefficient is obtained in the 0.95AF-0.05BT ceramic. Besides, it has also been confirmed that the 0.95AF-0.05BT ceramic has shown the ferroelectric relaxor behavior near room temperature. The ME coupling in these ceramics is related to the ferroelectric relaxation, where the polarization of nanoregions is modified by the applied magnetic field.
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