Grain-size effects on microwave ferrite magnetic properties

Effect of NiZn Ferrite Nanoparticles upon the Structure and Magnetic and Gyromagnetic Properties of Low-Temperature Processed LiZnTi Ferrites

“…The coercivity decreases rapidly after small amounts (x = 2) of NiZn ferrite nanoparticles are added, which is due to the increase of the average grain size, the more uniform grain size distribution (see Figure S2 and Table S1), and partial substitution of Fe 3+ ions with Zn 2+ ions from the NiZn nanoparticle ferrites. 3,45 Then the coercivity increases slightly with increasing content of NiZn ferrite nanoparticle addition, which could be attributed to the fact that the decreasing average grain size has more influence on the coercivity compared to the Zn 2+ ions that continue to occupy the (A) sites of the LiZnTi ferrites (see Figure S2 and Table S1). Thereafter, the coercivity rapidly decreases again with increasing content of NiZn ferrite nanoparticle addition, mainly due to the substitution of Fe 3+ ions with Zn 2+ ions from the NiZn ferrite additive.…”

Wideband electromagnetic wave absorber using doped barium hexaferrite in Ku-band

“…Even though many literatures have been reported on the fabrication of single layer wave absorbers [7][8][9][10][11], this is the first research which shows the possibility of fabrication of absorbers with the wideband EM absorption by substituting suitable cations. The current interest is to introduce substitution in barium ferrite which can easily tune the bandwidth of the reflection loss values.…”

Effects of sintering temperature and Bi2O3 content on microstructure and magnetic properties of LiZn ferrites

“…The coercivity value reduces with increasing sintering temperature. As discussed above, the grain size increases with sintering temperature, while the coercive force is inversely proportional to grain size [21]. Generally, a smaller grain size results in a high coercive force due to domain wall pinning that requires a higher energy for switching [22].…”

“…The dependence of DH on porosity can be expressed by the relation DH ¼ 1.5M s  P (where P is porosity, and M s saturation magnetization) [20]. The DH also exhibits a strong grain-size dependence varying as D À1=2 m [21]. With increasing Bi 2 O 3 content from 0 to 1.00 wt%, the DH decreases gradually due to the decreasing porosity.…”