Synthesis and magnetoelectric studies on Na0.5Bi0.5TiO3–BiFeO3 solid solution ceramics

Polycrystalline ceramics of 1 − x[Na0.5Bi0.5TiO3] − x[BiFeO3] (NBT–BFO) were synthesized by the modified Pechini's method to study their magnetic and magnetoelectric properties. A series of solid solutions exhibiting magnetoelectric output were formed when two iso-structural compounds Na0.5Bi0.5TiO3 (NBT) and BiFeO3 (BFO) were combined. Polarization-electric field hysteresis loops revealed that the maximum polarization (∼23 μC/cm2 for x = 0.1) decreased continuously with the increase of BFO content, following a hard doped effect. Piezoelectric charge coefficient (d33) = 41 pC/N was obtained for the ceramics with x = 0.1 and the value continues to decrease with the composition. Magnetic hysteresis loops represent the canted antiferromagnetic nature for x ≤ 0.6 and ferromagnetic-like behavior for the BFO-rich compositions. Magnetoelectric coupling was determined by measuring the magnetoelectric voltage coefficient which is ∼12.4 mV/cm-Oe at an ac magnetic field of 10 Oe (1 kHz), for x = 0.1 sample.

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