Complex permeability and microwave absorption properties of planar anisotropy Ce2Fe17N3−δ particles

Facile synthesis of a CNT@Fe@SiO2 ternary composite with enhanced microwave absorption performance

“…Different from the dielectric materials, the magnetic materials exhibit an obvious advantage for the impedance matching properties. In fact, a higher saturation magnetization value (M s ) for a magnetic material is always attributed to a higher m 0 value based on the following eqn (7): 25,26 (m 0 À 1)…”

Microwave absorption properties regulation and bandwidth formula of oriented Y2Fe17N3–δ @SiO2/PU composite synthesized by reduction–diffusion method

“…[11] Based on previous work about oriented microwave absorbers, the oriented composite absorber showed a dramatic increase in permeability and a remarkable decrease in the matching thickness. [13] In Fig.…”

“…[10] In addition, arc melting and a long homogeneous annealing were used to synthesize rare earth alloys in previous studies, which limits the production and complicates the process. [13,14] Therefore, it is urgent to explore and apply a new synthesis process to produce rare earth alloys efficiently in large quantities. As mentioned above, although the researchers have tried many materials and enumerated related data in detail to prove that their synthesized materials have excellent microwave absorption properties.…”

Synthesis and evaluation of microwave absorption properties of Fe 3 O 4 /Halloysite/polypyrrole nanocomposites

“…The RL of the absorber composites is supported by a perfect conductor and can be computed with the complex permittivity and permeability for the given frequency and absorber thicknesses. The RL of the composites can be computed by exerting the following equation and the measured electromagnetic parameters [40]: where RL shows the reflection loss in decibel unit, Z in is the normalised input impedance relating to the impedance in free space, f is the microwave frequency, d is the thickness of the absorbing layer, c is the velocity of the electromagnetic wave in vacuum, and ɛ r and μ r are the complex relative permittivity and permeability, respectively. The equation for impedance matching ( Z in = 1) becomes: The matching frequency ( f m ) and thickness ( d m ) can be specified by using (4).…”