Phase composition and magnetic properties of Ni1-xCoxFe2O4 nanocrystals with spinel structure, synthesized by Co-precipiation

Abstract

Nanopowders of nickel ferrite doped with cobalt were synthesized by co-precipitation using a 3 % KOH solution as a precipitant. The effects of different annealing regimes on the composition and particle size of Ni 1−x CoxFe 2 O 4 were studied. It was established that with annealing at t = 1000 • C for 2 h single-phase products were formed with a crystallite size of 30-50 nm. The saturation magnetization and the coercive force increased as the content of the dopant increased from 50.3 emu/g and 51.

Structural and Magnetic Characterization of Ni-Co Mixed Ferrite Nanopowders Synthesized via Coprecipitation and Sol-Gel Methods

“…Several investigations have studied the effect of the substitution of Co by Ni on the properties CoFe 2 O 4 nanoparticles 14,24,25 , as well as the influence of replacing transition metal ions (Zn 2+ , Mn 2+ , Co 3+ , Cr 3+ ) or rare earths ions (Tb 3+ , Tm 3+ , Ho 3+ , Nd 3+ ) in mixed Ni-Co ferrites [26][27][28][29][30] . Various synthesis methods, including coprecipitation 24,31 , sol-gel [27][28][29] , ultrasonic technique 26 , and sol-gel auto-combustion 30,32,33 , have been employed to produce these Ni-Co mixed ferrite nanoparticles. However, there is a lack of research comparing the structural characteristics and magnetic properties of Ni 0.5 Co 0.5 Fe 2 O 4 nanoparticles synthesized using coprecipitation and sol-gel methods.…”

Peculiarities of LaFeO3 nanocrystals formation via glycine-nitrate combustion

“…Lanthanum orthoferrite, due to its wide prevalence in comparison with other rare-earth elements (REE) and its particular property set, is the basis for many functional materials applied in catalysis, solid-oxide fuel cells, chemical sensors, magnetic and electrode devices etc. [2][3][4][5][6][7][8][9]. Lately, materials based on LaFeO 3 are also considered as promising materials to obtain hydrogen by the photocatalytic decomposition of water under visible light irradiation [10][11][12].…”