Influence of Ho–Ni–Mn substitution on the structural and magnetic behavior of Ba–Sr Co 2 Z-type nanohexaferrites extension up to Mossbauer investigations

摘要: A series of Co2Z-type Ba–Sr nanohexaferrites Ba1.5Sr1.5Co2−zHozMnxNiyFe24−x−yO41 (z = 0.0, 0.05, 0.10, 0.15, 0.20, x = y = 0.0, 0.25, 0.5, 0.75, 1.00) have been synthesized using sol–gel auto-combustion synthesis route. The effect Ho–Ni–Mn substitutions on crystallographic and magnetic properties was investigated XRD, VSM, Mossbauer spectroscopy. Microstructural analysis showed single-phase crystal structures without any impurities hexagonal with the space group P63/mmc. average variation in crystallite size ranges from 43 to 60 nm a slight increase X-ray density appreciable decrease porosity observed for different dopants. FE-SEM (Nova Nano SEM-450) substantiates structure HR-TEM images assisted SAED pattern confirm crystalline quality FWHM material, which significantly support XRD results. FTIR spectra two characteristic metal stretching peaks range 400–600 cm−1 due substitution Ho–Ni–Mn. Magnetic measurements show maximum saturation (Ms) at 44.04 emu g−1 elevated value coercivity (Hc) 224Oe imparting typical characteristics soft ferrite high coercivity. least squares fit sextets six distinguishable sites room temperature all samples substantially supports results VSM. materials large are useful permanent magnet applications. prepared composites could be applications microwave absorbing materials, storage, miniaturization antennas wireless communication devices.