Effect of La-Cu co-substitution on structural, microstructural and magnetic properties of M-type strontium hexaferrite (Sr1-xLaxFe12-xCuxO19)

The copper substituted various stochiometric compositional nano hexagonal ferrites of Sr1-xLaxFe12-xCuxO19 (x = 0.0, 0.05, 0.1, 0.15 and 0.2) are synthesized successfully via sol-gel auto-combustion method and subsequently sintered the samples at a temperature of 1200 degrees C/2 hrs. We observed the effect of La-Cu substitution on the structural and magnetic properties of hexagonal strontium ferrites. X-ray diffraction pattern reveals monophasic magnetoplumbite hexagonal structure with a space group of P6(3)/mmc, chemically pure, nanocrystalline, and magnetically ordered particles with magnetic properties. The unit cell parameter (a = b) unit cell parameter is found to decrease 5.896 angstrom to 5.857 angstrom whereas, crystallite sizes were observed to decrease from 36.28 nm to 20.07 nm with the increase in doping. FTIR spectra reveals the presence of octahedral and tetrahedral vibrational modes near 400 cm(-1) and 600 cm(-1) respectively which confirms the formation of hexaferrite phase. Saturation magnetization (Ms) increased from 62.37 emu/g to 67.27 emu/g with the increase in doping.

Automated summary

The substitution of La-Cu in nano hexagonal ferrites of Strontium had effects on the structural and magnetic properties, leading to a decrease in crystallite sizes and unit cell parameters, as well as an increase in saturation magnetization with doping levels.