Synthesis and characterization of nickel cobalt zinc ferrous hydrazine fumarate

Anisotropy and domain state dependent enhancement of single domain ferrimagnetism in cobalt substituted Ni–Zn ferrites

“…14,35,36 For x = 0.0 (Fig. 5) to 0.2 (x = 0.1 and 0.2 reported elsewhere 22,23 ) there is a slow and steady increase in susceptibility with temperature and a slow fall to zero with a tailing effect. In contrast, as the concentration of cobalt increases beyond x = 0.3 to 0.6 (x = 0.4 is reported elsewhere 22 ), the plots shows a peak with a detectable hump of maximum susceptibility values and a further increase in temperature results in a relatively sharp fall to T C .…”

“…Precursor combustion synthesized Co substituted Ni-Zn ferrites initiated studies of structural changes and associated effects on magnetic properties. The precursors 22,23 Co x Ni 0.6Àx Zn 0.4 Fe 2 -(C 4 H 2 O 4 ) 3 Á6N 2 H 4 (x = 0.0 to 0.6) have hydrazine as fuel incorporated in them, burning on their own once initially ignited, to form nanosized Co x Ni 0.6Àx Zn 0.4 Fe 2 O 4 (x = 0.0 to 0.6). All these compositions were prepared by the combustion of precursors.…”

“…These precursors were first precipitated out, characterized, autocombusted by igniting with burning splinters and finally calcined at 500 1C for 5 hours to remove carbonaceous matter. 22,23 The structural changes with Co inclusion were monitored by X-ray diffraction and Raman spectroscopic studies. The lattice parameters and occupation of different lattice sites by metal ions were investigated thoroughly.…”

“…Nanoparticles of Co x Ni 0.6Àx Zn 0.4 Fe 2 O 4 (x = 0.0 to 0.6) were prepared by a precursor combustion method described in detail elsewhere 22,23 and synthesized accordingly. The crystal structure and phase purity of all the compositions was confirmed using a Rigaku Miniflex X-ray diffractometer with a monochromatized CuK a (l = 1.5418 Å) radiation source filtered through a Ni absorber.…”