Structural and magnetic investigations of (1-x) (Bi0.5Na0.5TiO3)0.94-(BaTiO3)0.06 + (x) SrYFe11O19

Abstract

This paper describes the manufacturing, structural characteristics, and magnetic properties of a ferroelectric (Na0.5 Bi0.5TiO3-BaTiO3; BNBT) and ferromagnetic (SrYFe11O19; SRYFO) composite system. The polycrystalline composite system (1-x) (Bi0.5Na0.5TiO3)0.94-(BaTiO3)0.06 + (x) SrYFe11O19 (x = 0.00, 0.25, 0.50, 0.75 and 1) was synthesized via solid state reaction followed by modified Sol-gel auto-combustion method. Rietveld refinement of the XRD pattern confirms the presence of dual phase symmetry consisting of BNBT (P4bm) and SRYFO (P63/mmc) phases without any external impurity phase. The calculated value of c/a, cell volume, and grain size confirms the lattice distortion. FE-SEM (Field emission scanning electron microscope) was used to study the morphology formation of prepared composites, which revealed that composites are dense ferroelectric grains well distributed in the ferrite matrix, and the grain size of the nanoparticles ranged from 166 to 240 nm. The magnetic characterization was carried out by VSM (Vibrating Sample Magnetometer) with the applied field in the range of −15 kOe to + 15kOe at room temperature. The M−H loop reveals the ferromagnetic nature of composites. The calculated saturation (MS), remnant (Mr), and coercivity (HC) values are increased with ferrite content. The obtained MS/Mr values are found lesser than 0.49, proving the presence of a solitary, non-interacting realm with a single axial anisotropy. These samples can be used to make permanent magnets and perpendicular recording media.