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Cobalt is a ferromagnetic metal and one of the most important industrial raw materials. It is used for producing magnetic and high strength superalloys. It is also a source of the radioactive isotope Co-60, which is used for medical and nuclear applications. cobalt ferrite is a common cathode material for nickel-cadmium batteries and displays good chemical stability and resistance losses compared with gadolinium doped ceria (GDC). Another ferrite-based cathode is Lan1-xSrxCoyFe1-xO3 (LSCF, lanthanum strontium cobalt ferrite) which has good electrocatalytic activity.
We used a sonochemical approach for the synthesis of spherical Co-Fe NPs with an average size ranging between 3.8 and 9.5 nm. The synthesis was performed in a mixture of Co (III) acetate tetrahydrate, Fe(II) acetate trihydrate and NaOH pellets (AR Grade, Merck). The reactions were carried out on a sonicator.
TEM analysis of the cobalt-ferrite NPs confirmed their spherical shape and monodispersity. The size of the NPs increased linearly with the surfactant concentration. At low concentrations of OA and OLA (248 mM and 124 mM, respectively) spherical NPs were formed. On increasing the molar ratio of Co(acac)2: Fe(acac)3 up to 1.5 : 1, the NPs changed their shape and size to a cube-like form.
The samples analyzed were basalts, originating from the flanks and summits of cobalt-rich ferromanganese crusts. The morphology of these rocks was phaneritic and porphyritic with intergranular, needle-like, and in some areas directional veins as well as vesicules up to 0.7-0.8 mm in diameter. The feldspar group was represented mainly by the bytownite-labradorite-andesine series, with minor phenocrysts of alkali rich albite and orthoclase-sanidyne.