The preparation and microwave properties of Ba2ZnxCo2−xFe28O46 hexaferrites

Complex permittivity and microwave absorption properties of carbon nanotubes/polymer composite: A numerical study

“…If both the frequency and the temperature dependence of a material's dielectric properties are very weak, the material's permittivity usually is approximated as a constant over certain frequency range [38,39]. For example, the permittivity of some polymers such as polyethyl methacrylate [13] and polystyrene [14] has approximately a complex, frequency independent form in microwave frequency range, i.e., ε * d = ε d − iε d , where ε d and ε d are constants.…”

Complex conductivity and permittivity of single wall carbon nanotubes/polymer composite at microwave frequencies: A theoretical estimation

“…However, both the frequency and the temperature dependence of a material's dielectric properties are very weak, and the material's permittivity is usually approximated as a constant over a certain frequency range [48,49] . For example, the permittivity of some polymers such as poly(ethyl methacrylate) [27] and polystyrene [50] has approximately a complex, frequency-independent form in microwave frequency range, i.e.…”

Effect of sintering temperature on structural property of X-type barium-zinc hexaferrites

“…This process has advantages of simple preparation and resulting nanocrystalline homogeneous powder 10 . In present paper we have used sol-gel technique for preparation of Ba 2 Zn 2 Fe 28 O 46 to achieve homogeneity at atomic level in the precursor 11 …”