Synthesis, Structural and Magnetic Properties of BaFe_12-2xCu_xTi_xO₁₉ Hexaferrites

Abstract

BaFe_12-2x Cu _x Ti _x O₁₉ (x = 0, 1, 1.5, 2) were synthesized by the solid state diffusion method. X-ray diffraction (XRD) results confirmed the formation of a single phase magnetoplumbite with hexagonal unit cell of space group P6₃/mmc. With the increase inx, the lattice parameter a decreased and c increased. Well-formed polycrystalline hexagonal crystals with prominent grain boundaries were observed through scanning electron microscopy (SEM). Vibrating sample magnetometer (VSM) study shows decrease in hysteresis area and Curie temperature (T _c ) with the increase in x. Superparamagnetic nature was observed for the ferrite with x = 2. The decrease in saturation magnetization (M _s ), remnant magnetization (M _r ) and coercivity (H _c ) with increase in concentration of Cu²⁺ and Ti⁴⁺ is due to the decrease in exchange interactions like 2a-12k, 2a-4f₁ and 4f₁-12k.

Keywords:

• Coercivity
• Ferrite
• Hysteresis
• Magnetization
• Magnetoplumbite
• Morphology
• Porosity
• Superparamagnetism
• XRD

Notes

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