Preparation and magnetic properties of Ir–Co and La–Zn substituted barium ferrite powders obtained by sol–gel

Preparation and magnetic properties of La–Mn and La–Co doped barium hexaferrites prepared via an improved co-precipitation/molten salt method

“…Small amounts of substituent will not affect the crystal structure and morphology of the samples significantly but the lattice is distorted and crystallinity reduced when x is increased to 0.60. The observation that grain size decreases with increasing doping concentration x was also noted in previous work with other synthesis methods [23][24][25][26]. When x is increased from 0.25 to 0.5, there is a relatively large decrease in the c cell dimension from 23.023 to 22.981 Å for Sr 1 À x La x Fe 12 O 19 [18].…”

“…The existence of maxima for M s and H c at low values of x is quite common for La-Cr, [17] La or Pr doped, [19] La-Zn, [22,23] La-Co [26] barium ferrites. The doped products synthesized here at relatively lower temperatures with the improved approach give M s and H c values comparable to those obtained with the higher temperature approaches.…”

Effect of La doping on structural, magnetic and microstructural properties of Ba1 − x La x Fe12O19 ceramics prepared by citrate combustion process

“…Insertion of Gd or Pr into Fe lattices inhibited grain growth, reduced grain size and controlled the coercive force for wide practical applications [21]. Corral Huacuz et al [22] and Du et al [23] found that La-Zn substitution greatly modified the magnetic properties and microstructure of barium ferrites. These substituted hexaferrites yielded more homogeneous microstructure and fine crystallite sizes compared with pure specimen.…”

Improvement in magnetic properties of La substituted BaFe12O19 particles prepared with an unusually low Fe/Ba molar ratio

“…In this paper, magnetization measurements were performed at low temperatures, 5 K, and revealed that saturation magnetization decreases with increasing La concentration. In the literature, substitutions of La together with another cation to Ba/Sr and Fe-sites of M-type hexaferrites have also been reported [12,13,20,21]. Among these, La-Co substitutions to SrM, for example, cause remarkable increase in coercivity from 3.5 to 6.7 kOe and quite high saturation magnetization up to 65 emu/g [21].…”