Effects of synthesis route on the structural and magnetic properties of Sr1-xRExFe12O19 nanocrystalline hexaferrites

Structural and magnetic properties of RE-Al substituted nanocrystalline hexaferrites (Sr1−xRExAl2Fe10O19)

“…The observed decrease could be associated mainly with two factors, namely, the preferential substitution of Al 3+ ions at spin-up Fe 3+ sites, and spin canting due to the reduction of the superexchange interactions between spin-up and spin-down sublattices [41]. The reduction of the saturation magnetization due to partial RE substitution for Sr in M-type hexaferrites was also reported by others [30,42,43].…”

New nanosized Gd–Ho–Sm doped M-type strontium hexaferrite for water treatment application: experimental and theoretical investigations

“…This value is improved due to the increase in the H c and M r values. The reported (BH) max values from the literature include: 90 The obtained value of (BH) max in this work has yielded much higher values than those reported by other researchers, which is the essential achievement of this work.…”

Effects of pH value and Sintering Temperature on the Structural and Magnetic Properties of Barium Hexaferrites Prepared by Co-Precipitation

“…Recently, the effects of synthesis method (ball milling versus sol-gel method), cationic substitutions, and sintering temperature on the magnetic properties of M-type hexaferrites for permanent magnet applications demonstrated high sensitivity to these experimental parameters. 14,15 While low sintering temperatures (< 1000°C) are required for preparing M-type hexaferrites with single domain magnetic particles and enhanced coercivity, it is difficult to prepare a high purity phase by conventional ceramic method or ball milling using such low sintering temperatures, which leads to lower magnetic parameters. Alternatively, researchers have used special substitution scenarios to produce M-type hexaferrites with high coercivities suitable for high quality permanent magnets.…”

“…Alternatively, researchers have used special substitution scenarios to produce M-type hexaferrites with high coercivities suitable for high quality permanent magnets. [15][16][17][18][19][20][21] However, in several cases, the improvement of the coercivity was accompanied by some drawbacks such as unfavorable decrease of the saturation and remnant magnetizations, the use of expensive rare-earth elements, and elaborate experimental procedures. [20][21][22][23][24] Co-precipitation technique was reported to be successful for the preparation of M-type hexaferrites with controlled particle size distribution and enhanced coercivity at low sintering temperatures.…”