Publications

A series of Sr2Cu2PrxFe28-xO46 (x = 0.00 to x = 0.32 with a step of 0.08) hexagonal ferrite was synthesized by the heat treatment method, and heated at 1300 °C for 6 h. These samples were characterized using FTIR, XRD, FESEM, VSM, and low-frequency (20 Hz–2 MHz) dielectric measurements. FTIR investigation confirms the ferrite phase formation in all the samples. XRD investigation reveals that all samples possess the X-type as a major phase with a minor M-phase. FESEM images show smaller grain size ranges between 25.27 μm and 51.25 μm. EDX elemental analysis confirms the existence of constituent elements in synthesized materials. VSM analysis shows that prepared ferrites possess a soft magnetic nature, the saturation magnetization of heated samples was found in the range of 35.99 Am²/kg to 49.44 Am²/kg, and coercivity was observed in the range of 10.372 kA/m to 37.443 kA/m. Relaxation peaks have been observed in the loss tangent profile for x = 0.00, 0.08. The Nyquist plot for samples S1 and S2 represents the low-loss universal capacitance circuit, while samples S3 to S5 represent the parallel conductance-capacitance circuit.

A series of Co²⁺ substituted R-type hexagonal ferrites was synthesized using heat treatment method with composition Sr1-xAl2CoxFe4O11 (x = 0.0, 0.1, 0.2, 0.3, 0.4 and 0.5). The obtained precursors were heated at 950 ºC for 3 h and then characterized using various instrumental techniques. The XRD pattern of all the samples depicts the R-phase as a major phase with an additional Fe3O4 phase. Magnetic parameters like saturation magnetization (Ms), coercive field (Hc), and remanent magnetization (Mr), were estimated from hysteresis loops of the samples. Magnetic analysis revealed that prepared ferrite samples possess a multi-domain nature that is randomly oriented. The non-linear variation in magnetic parameters was observed with the increase in cobalt doping content. The dielectric constant with cobalt substitution decreases with respect to the pristine sample.