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What is the permittivity of iron?

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I'm dealing with the same question in the moment and as far as I can tell the answers depends strongly on the samples structure, especially if it is a powder, e.g. cabonyl iron powders (approx. 96% iron) have 4.5<e'<6.5 and 0<e''<1 (e= e'-ie'') at frequencies 8<f<18 GHz [1]. Dispersions of magnetic iron fibers on the other hand have much higher permittivity depending on their size, 5<e'<65, 0<e''<12, 2.6<f<4 GHz [2].

[1] Complex permittivity and permeability of carbonyl iron powders at microwave frequencies W. Yong, M.N. Afsat, R. Grignon, Antennas and Propagation Society International Symposium, IEEE 4 (2003) 619 - 622

[2] Preparation and microwave characteristics of magnetic iron fibers M. Wu,Z. Zhao, H. He, X. Yao Journal of Magnetism and Magnetic Materials 217 (2000) 89-92

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First answer by Agliso. Last edit by Agliso. Contributor trust: 15 [recommend contributor]. Question popularity: 18 [recommend question]

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