Bulk magnetic properties of Co-Zn ferrites prepared by the co-precipitation method

Abstract

The alternating current (a.c.) susceptibility versus temperature and magnetization measurements are reported for the disordered spinel ferrite system Znx COl_x Fe2 04 prepared by a wet chemical method before and after high temperature annealing. The low field a.c. susceptibility measurements indicate that the low temperature synthesis of wet prepared Co-Zn ferrites aids the formation of spin-clusters and thereby increases the magnetic inhomogeneity. The X-ray analysis shows that the samples are single phase spinels and the variation of lattice constant with zinc concentration deviates from Vegard's law i-1 ]. The high temperature annealing changes the wet prepared ferrites into the ordered magnetic structure of the ceramic ferrites.

Structural and magnetic properties of zinc- and aluminum-substituted cobalt ferrite prepared by co-precipitation method

“…Though, structural and magnetic properties of Co 1−x Zn x Fe 2 O 4 [9] and CoFe 2−x Al x O 4 [10,11] ferrite system prepared by coprecipitation method have been studied separately, no attempt has been made to study the simultaneous dilution of tetrahedral (A) site and octahedral (B) site by adding zinc (Zn 2+ ) in place of cobalt (Co 2+ ) and aluminum (Al 3+ ) in place of ferric (Fe 3+ ) ions respectively in cobalt ferrite.…”

“…Further, the properties of Co 1−x Zn x Fe 2−x Al x O 4 (Co-Zn-Fe-Al) will be compared with those of Co 1−x Zn x Fe 2 O 4 (Co-Zn) [9] and CoFe 2−x Al x O 4 (Co-Al) [10,11] systems, prepared by wet chemical co-precipitation technique and annealed at 800 • C.…”

Temperature dependent elastic properties of nanocrystalline Co1−Zn Fe2O4

“…The substitution of Zn 2 þ for Fe 3 þ reduces the Curie temperature of the ferrite [6,7,9]. On the other hand, increasing the zinc content in cobalt zinc ferrites increases their lattice parameters [10][11][12] and saturation magnetization decreases due to augmented B-B interaction followed by reduced A-B interaction.…”

“…Fe O [ ] + + + − + [6][7][8]. The substitution of Zn 2 þ for Fe 3 þ reduces the Curie temperature of the ferrite [6,7,9].…”

Magnetic phase evolution and particle size estimation study on nanocrystalline Mg–Mn ferrites

“…Nanocrystalline materials can be synthesized either by consolidating small clusters (bottom-up approach) or breaking down the polycrystalline bulk materials into crystalline units with dimensions of nanometer (top-down approach) Vasoya et al 2010). It is also known that the high temperature sintering of nanoparticle ferrite precursors transforms them into coarse-grained ceramics ferrite materials (Pandya et al 1991).…”