NDLI: Effect of Temperature on the Structural and Magnetic Properties of Ni x Co 1 – x Fe 2 O 4 Nanoparticles

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Effect of Temperature on the Structural and Magnetic Properties of Ni x Co 1 – x Fe 2 O 4 Nanoparticles

Content Provider	Semantic Scholar
Author	Bushkova, V. S.
Copyright Year	2018
Abstract	In the work, single-phase ferrite powders of NixCo1 – xFe2O4 systems were synthesised using the sol-gel technology with participation of auto-combustion. It was found that the average size of coherent scattering regions does not exceed 62 nm. The dependences of the lattice parameter, X-ray density and specific surface area of the ferrite powders versus the nickel content were obtained. The unit cell parameter a decreases linearly with nickel concentration due to smaller ionic radius of nickel. After annealing of ferrite powders at the temperature of 1300 °C, which were pressed in the form of a toroid at the pressure of 3.3·108 Pa, Xray analysis showed that the found rings are single-phase with the cubic structure of spinel space group Fd3m. The dependence of the initial permeability on the degree of substitution of cobalt cations by nickel cations is obtained. It is revealed that the crystallite size has a significant influence on the magnetic properties of the samples. With decreasing crystallite size of nickel-cobalt ferrite, the Curie temperature decreases. Because of strengthening of the A-B exchange interaction, the increase in the Curie temperature occurs with increasing parameter x. It is shown that the smaller the particle size, the greater the thickness of the surface layer with significant violations of the magnetic structure.
File Format	PDF HTM / HTML
Alternate Webpage(s)	https://jnep.sumdu.edu.ua/download/numbers/2016/1/articles/en/jnep_eng_2016_V8_No1_01002_Bushkova.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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