Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 886, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2021.161195
Keywords
Ni(0.5)Zn(0.5)Ee(2)O(4); Solution combustion synthesis; Porosity; Microwave absorption properties
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Hierarchical porous NiZn ferrite powders with tunable microstructure and properties were prepared using metal nitrates as oxidants and glycine as fuel. The addition of glycine affected the formation of FeNi3 phase and led to increased magnetization, permittivity, and permeability. The powders exhibited high microwave absorption performance with reflection loss of -48 dB in Ku band at a specific fuel to metal nitrates ratio.
Hierarchical porous Ni(0.5)Zn(0.5)Ee(2)O(4) ferrite powders were prepared by using metal nitrates as oxidants and glycine as fuel. The fuel contents were used for tuning the microstructure, magnetic, permittivity, and permeability properties to obtain a high microwave absorption performance. The pure NiZn ferrite powders were directly crystallized at lower fuel contents, while about 2 wt% intermetallic FeNi3 phase appeared at fuel to total metal nitrates molar ratio of 2. The combusted powders with high specific surface areas of 51 m(2)/g showed porous and foamy microstructure. The saturation magnetization of the combusted powders increased from 36.5 to 78.5 emu/g by the formation of FeNi3 phase at the higher fuel contents. With the increase of glycine fuel to total metal nitrates molar ratio from 1 to 2, the real and imaginary parts of permittivity increased from 4.5 to 6 and from 0.8 to 1.1, respectively, while the values of real and imaginary permeability slightly increased. The high microwave absorption performance, including reflection loss of -48 dB with effective bandwidth of 2.9 GHz in Ku band at the matching thickness of 4.5 mm, was obtained at the fuel to total metal nitrates ratio of 2. (C) 2021 Elsevier B.V. All rights reserved.
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