Synthesis and characterisation of Ni0.25Co0.75Fe2O4 nanostructures

Abstract

ABSTRACT. The synthesis of Ni0.25Co0.75Fe2O4 nanoparticles has been achieved by a simple thermal decomposition method from the inorganic precursor, Ni0.25Co0.75Fe2(cin)3(N2H4)5, which was obtained by a novel precipitation method from the corresponding metal salts, cinnamic acid and hydrazine hydrate. The precursor was characterised by hydrazine and metal analyses, infrared spectral analysis and thermo gravimetric analysis. On appropriate annealing, Ni0.25Co0.75Fe2(cin)3(N2H4)5 yielded Ni0.25Co0.75Fe2O4 nanoparticles, which were characterised for their size and structure using X-ray diffraction (XRD), high resolution transmission electron microscopic (HRTEM), selected area electron diffraction (SAED) and scanning electron microscopic (SEM) techniques.

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“…In the IR spectrum of Ni(C 9 H 7 O 2 ) 2 (N 2 H 4 ) 2 , a sharp band was noticed at 972 cm -1 , which corresponds to the N-N stretching frequency, explicitly proving that the hydrazine moieties are coordinated with the metal in a bidentate bridging fashion [20,21]. The carboxylate ion asymmetric and symmetric stretching frequencies were observed at 1612 and 1384 cm -1 , respectively with the ∆υ value of 288 cm -1 , indicating the monodentate liganding of -COOH groups.…”

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Effects of ternary metal additions on corrosion of spark plasma sintered Ni-Fe alloys in H2SO4 and NaCl

“…Diverse reports are available on imparts of alloying on the chemical, microstructural and phases characterization/behavior of different type of engineering materials. These include the super-alloys, steels and aluminum alloys [5][6][7], nickel nano-particles [8] and titanium base alloys, etc., and their corrosion behaviors [9] and control [10][11][12][13][14][15] in different media [16][17][18]. The current research development in the Ni-Fe-based austenitic matrix which falls under the category of Ni-based alloys is beginning to receive attention from researchers.…”