Crystal Chemistry, Magnetic and Dielectric Properties of Nickel Doped Strontium Ferrites

The SrNixFe12−2xO19 (where x = 0.0–0.8) hexaferrites powders were synthesized using Co-precipitation method and the pellets were prepared at 1100 °C/4 h in muffle furnace. XRD, FTIR, SEM and EDS analysis were used to analyze the samples structural parameters. The changes in the lattice parameters ‘a’&‘c’ are due to the differences in ionic radii. The average grain size (<D>) was estimated from SEM images and found to be in between 1.713 m (x = 0) - 0.549 m (x = 1.0). Observations indicated a decrease in saturation magnetization decreased from 68 emu/g (x = 0.0) to 50 emu/g (x = 0.6) and for x > 0.6, MS increases to 64 emu/g (x = 0.8). The coercivity exhibit anisotropic variation with doping concentration. In the present investigation, the samples shows ε = 487; tanδ = 1.97 for x = 0.6, and ε = 181; tanδ = 1.01 for x = 0.8, respectively. The observed results can be explained on the basis of composition,relaxationphenomena and super exchange interaction.

BARIUM AND STRONTIUM FERRITS SYNTHESIZED IN THE SUN FURNACE

Magnetic materials synthesized from a melt in a solar furnace were studied. It is shown that melts consist of crystallites of a metastable structure and an amorphous phase. This state contributes to a directed change in structurally sensitive properties (electrical, magnetic, and optical). It has been revealed that the magnetization values of barium and strontium ferrites synthesized from a melt in a stream of concentrated solar radiation increase 1.8 times in comparison with materials synthesized from solid-phase reactions. KEYWORDS- ferrites, magnetic material, solar furnace, structural defects, magnetization.