Nanoferrites of nickel doped with cobalt: Influence of Co2+ on the structural and magnetic properties

被引:28
作者
Rodrigues, A. P. G. [1 ]
Gomes, D. K. S. [2 ,5 ]
Araujo, J. H. [3 ]
Melo, D. M. A. [1 ]
Oliveira, N. A. S. [1 ]
Braga, R. M. [4 ]
机构
[1] Univ Fed Rio Grande do Norte, Inst Chem, BR-59072970 Natal, RN, Brazil
[2] Univ Fed Rio Grande do Norte, Lab Catalysis & Mat, Grad Program Mat Sci & Engn, BR-59072970 Natal, RN, Brazil
[3] Univ Fed Rio Grande do Norte, Dept Theoret & Expt Phys, Lab Magnetism & Magnet Mat, BR-59072970 Natal, RN, Brazil
[4] Univ Fed Paraiba, DEER CEAR, BR-58051970 Loao Pessoa, PB, Brazil
[5] CAPES PNPD, Coordinat Improvement Higher Educ Personnel, Canoas, Brazil
关键词
Ferrite; Spinel; Nickel; Cobalt; Combustion; Magnetic propertie; ZN-FERRITE; MN; CRYSTALLINE; SPINEL; GD;
D O I
10.1016/j.jmmm.2014.09.045
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Nanoferrites of nickel substituted with cobalt of composition Ni1-xCoxFe2O4 (0 <= x <= 0.75), were synthesized by combustion reaction assisted in microwaves. The influence of the substitution of Ni2+ by Co2+ content and the concentration of Co2+ in the structural and magnetic properties was investigated. The powders were prepared by combustion according to the concept of chemical propellants and heated in a microwave oven with a power of 7000 kW. The synthesized powders were characterized by absorption spectroscopy in the infrared region (FTIR), X-ray diffraction (XRD) together with Rietveld refinement, surface area (BET) method, scanning electron microscopy (MEV) and magnetic measurements (MAV). The results indicated that it was possible to obtain nickel ferrite doped with cobalt in all compositions and that an increase of cobalt concentration caused an increase in particle size (9.78-21.63 urn), a reduction in surface area, and reduction in magnetic concentrations greater than 50%. (C) 2014 Published by Elsevier B.V.
引用
收藏
页码:748 / 754
页数:7
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