Preparation, and magnetic and electromagnetic properties of La-doped strontium ferrite films

Ferrites Obtained by Sol-Gel Method

“…Further, the dielectric loss angle tangent (tanδ) of SrFe 12 O 19 ferrite films is considerably decreased with La 3+ substitution. SrLa 0.2 Fe 11.8 O 19 shows the broader microwave absorption frequency and higher tanδ >0.1 in the frequency range of 9 to 10.5 GHz (Li et al 2011).…”

“…Y.Q. Li et al investigated the feasibility of producing rare earth lanthanum (La 3+ ) substituted strontium ferrite, SrLa x Fe 12Àx O 19 , thin films using sol-gel and self-propagating high-temperature synthesis to investigate the co-relation between crystal structure quality, microwave absorption, and magnetic properties (Li et al 2011). The ratio of Sr:Fe was 1:9, the ratio of Sr:La varied from 1:1 to 0, and the molar ratios of glycol to citric acid and citric acid to metallic ions were 2:1 and 2.5:1, respectively.…”

Synthesis and electromagnetic properties of La-doped Ni–Zn ferrites

“…(2) When the La 3 þ substitutes Fe 3 þ , partially Fe 3 þ will convert to Fe 2 þ and the presence of Fe 2 þ may enhance the electron hopping to compensate the valence imbalance. The electron hopping between ions with different valence induces the electric dipole polarization, which leads to improving of the dielectric loss [9,23].…”

“…Several techniques have been employed to prepare rare earth ions substituted ferrites, such as co-precipitation, sol-gel method, combustion synthesis, refluxing method, solid state method and hydrothermal method [15][16][17][18][19][20][21][22]. Extensive studies have been done to prepare rare earth-doped strontium and barium hexagonal ferrites [23][24][25]. However, few studies are available on the rare earth ions (La)-doped NiZn ferrites, which is the main subject in this research.…”

Microstructure, AC impedance and DC electrical conductivity characteristics of NiFe2-xGdxO4 (x = 0, 0.05 and 0.075)

“…[12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31] However, the efforts towards understanding the effect of the substitution of rare earth (R) ions in spinel oxides are meager. Engineering the materials and development of devices for high frequency applications based on nickel ferrites is clearly dependent upon the fundamental knowledge of electrical behavior of these materials.…”