The optimum synthesis of high coercivity Pb–M hexaferrite powders using modifications to the traditional ceramic route

Magnetic properties of lead ferrite nanoparticles prepared by the polymerized complex method

“…The possible explanations for the low σ S in small crystallite size are that due to spin canting at the surface and/or in the interior of the nanoparticles [20]. Moreover, the value of coercivity (H C ) ( Table 1) is much lower than those literature reported recently on the studies of hexagonal lead ferrites [21][22][23]. It should be pointed out that PbO·5Fe 2 O 3 nanoparticles exhibit a soft magnetic characteristic which has not been reported previously in this compound.…”

Formation and magnetic properties of nanosized PbFe12O19 particles synthesized by citrate precursor technique

“…21-0686) appear and become sharper with the increase of the decomposition temperature. The temperature that PbFe 12 O 19 crystal starts to appear is 700 • C and this is much lower than those needed in previously reported methods to prepare hexaferrites [12,17]. At 900 • C, the appearance of all PbM ferrite peaks, the decrease of the line width and the increase of the diffraction line intensity demonstrate the improvement of the crystallinity and the increase in grain size.…”

Hexagonal Ferrites, Synthesis, Properties and Their Applications

“…Modifications to the traditional ceramic technique yielded PbFe12O19 hexaferrite powders with strong coercivity. At this temperature (presintered at 900°C/2 h and sintered at 1000°C/2 h), the highest parameters of saturation magnetization and coercive field were 62.0 emu/g and 4.0 kOe, respectively [31]. The traditional ceramic technique was used to make Nd-NbZn co-substituted M-type Ca-Sr hexaferrites with nominal compositions of Ca0.4Sr0.6-xNdxFe12.0-x(Nb0.5Zn0.5)xO19 (x = 0.00-0.32) [30].…”