NANOSYSTEMS: PHYSICS, CHEMISTRY, MATHEMATICS, 2017, 8 (3), P. 371–377
Phase composition and magnetic properties of Ni1-xCoxFe2O4 nanocrystals with spinel structure, synthesized by Co-precipiation
Anh Tien Nguyen – Ho Chi Minh City Pedagogical University, Ho Chi Minh City, Vietnam; email@example.com
Tien Dat Nguyen – Ho Chi Minh City Pedagogical University, Ho Chi Minh City, Vietnam; firstname.lastname@example.org
V. O. Mittova – Burdenko Voronezh State Medical University, Voronezh 394036, Russia; email@example.com
M.V. Berezhnaya – Voronezh State University, Voronezh 394018, Russia; firstname.lastname@example.org
I.Ya. Mittova – Voronezh State University, Voronezh 394018, Russia; email@example.com
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 Ni1-xCoxFe2O4 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 51.94 Oe for NiFe2O4 to 80.45 emu/g and 848.32 Oe for CoFe2O4.
Keywords: ferrites, spinel, nanocrystals, coprecipitation, magnetic properties.
PACS 75.50.Cc, 81.07.Wx